CN111159813A - Simulation-based flow-solid coupling analysis method and system for ship slamming on wave - Google Patents
Simulation-based flow-solid coupling analysis method and system for ship slamming on wave Download PDFInfo
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- CN111159813A CN111159813A CN201911312899.XA CN201911312899A CN111159813A CN 111159813 A CN111159813 A CN 111159813A CN 201911312899 A CN201911312899 A CN 201911312899A CN 111159813 A CN111159813 A CN 111159813A
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Abstract
The embodiment of the invention relates to a simulation-based fluid-solid coupling analysis method and system for a ship slamming on waves, wherein the method comprises the following steps: importing a ship model, setting and meshing an external flow field calculation domain to generate a calculation domain mesh; selecting a wave model according to a given navigation sea area; calculating a flow field around the ship by combining the wave model with the calculation domain grid to obtain the pressure distribution on the surface of the ship; dividing a ship body grid aiming at the ship model to generate a ship body grid; according to the pressure distribution of the hull grids, introducing fluid load, and performing static structure analysis to obtain stress and deformation data; and (4) carrying out ship structure strength analysis by utilizing the stress and deformation data analyzed by various different wave models to obtain a fluid-solid coupling analysis result. The simulation of the invention is more in line with the actual sea condition, the motion rule and the structural deformation effect of the ship under different slamming loads are researched, and the numerical analysis of the fluid-solid coupling of the air-sea water-ship in the process of simulating the real wave slamming is realized.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a simulation-based upper wave slamming lower ship fluid-solid coupling analysis method and system.
Background
Waves are an obvious natural phenomenon in the sea, and meanwhile, the waves are also important research objects in the design process of ships, and violent waves can cause violent impact on the ships, and the phenomenon is called wave slamming. Slamming is an impact type hydrodynamic load acting on a ship structure, and the slamming process is a complex hydrodynamic phenomenon, particularly relates to a coupling process of a gas-liquid-solid three-phase medium, and has the characteristics of instantaneity, nonlinearity, periodicity and the like. The hydrodynamic load problem in the sailing process of the ship is very complex, the hull, the appendage and the propeller of the ship are excited by hydrodynamic forces such as water flow, waves, shock waves and the like, the phenomenon of high-frequency vibration or low-frequency oscillation can occur, the flow field around the ship can change accordingly, and the stress of a structure is further influenced. The wave-raising slamming problem is increasingly emphasized from the perspective of hull structural strength design and the perspective of ship sailing operation safety, and model tests and numerical simulation methods are gradually the main means for researching the wave-raising slamming problem.
However, the existing analysis model has long test period, high cost, poor repeatability and certain limitation, is difficult to meet the analysis and research requirements of wave slamming, and numerical simulation gradually becomes a mainstream research means of slamming problems.
At present, numerical simulation means mainly perform numerical simulation aiming at still water slamming of a simplified structure and a local structure of a ship body, but results in the aspects of integral ship slamming coupling response and slamming research in wave sea conditions are relatively few, and the existing wave slamming research means is mainly based on wave slamming analysis of one-way regular waves, has larger difference with real sea conditions and is difficult to research the wave slamming problem encountered by the ship in the marine navigation process.
Based on the above, the prior art has the problem that the numerical simulation method is difficult to simulate the fluid-solid coupling of the air-seawater-ship in the real wave slamming process.
The above drawbacks are expected to be overcome by those skilled in the art.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the invention provides a simulation-based fluid-solid coupling analysis method and system for a wave-surfing slamming ship, which solves the problem that the numerical simulation method in the prior art is difficult to simulate the fluid-solid coupling of the air-sea water-ship in the real wave-surfing slamming process.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a simulation-based fluid-solid coupling analysis method for a wave-rising slamming ship, which comprises the following steps:
importing a ship model, setting an outer flow field calculation domain of a ship, and performing grid division on the outer flow field calculation domain to generate a calculation domain grid;
selecting a corresponding wave model according to the given navigation sea area of the ship in combination with wave classification;
calculating a flow field around the ship by combining the calculation domain grid according to the wave model to obtain the pressure distribution on the surface of the ship;
dividing the ship body grids aiming at the ship model to generate ship body grids;
combining the pressure distribution and introducing fluid load according to the hull grids, and performing static structure analysis to obtain stress and deformation data;
and (4) carrying out ship structure strength analysis by utilizing the stress and deformation data analyzed by various different wave models to obtain a fluid-solid coupling analysis result.
In an exemplary embodiment of the present invention, before importing the ship model, the method further includes:
and building a fluid-solid coupling analysis module.
In an exemplary embodiment of the present invention, the setting the out-flow field calculation domain of the ship comprises:
setting an upper boundary, a lower boundary, a left boundary, a right boundary, a front boundary, and a rear boundary of the out-flow field computation domain based on the size of the vessel;
the distance from the upper boundary to a ship deck is set to be 1 time of ship length, the distance from the lower boundary to the lowest position of the lower surface of the ship is 1 time of ship length, the distances from the left boundary and the right boundary to a ship board are both 1 time of ship length, the distance from the front boundary to a ship bow is 1.5 times of ship length, and the distance from the rear boundary to a ship stern is 1.5 times of ship length.
In an exemplary embodiment of the present invention, the gridding the computation domain of the external flow field, and the generating the computation domain grid includes:
and the same grid setting is adopted for the overlapped part of the foreground grid and the background grid, and the grids around the ship are encrypted.
In an exemplary embodiment of the present invention, before the selecting the corresponding wave model according to the given sailing sea area of the ship, the method further includes:
and aiming at wave classification in different sea area ranges, establishing wave model databases of different sea areas according to different parameters of frequency, wave height, wave speed, phase and wave spectrum of sea conditions in the sea areas.
In an exemplary embodiment of the present invention, the selecting the corresponding wave model according to the given sailing sea area of the ship comprises:
determining a given navigation sea area, and acquiring wave data within the given navigation sea area;
classifying according to the wave data to obtain a classification result;
and according to the classification result, corresponding to the wave classification in the wave model database to obtain a wave model corresponding to the given navigation sea area.
In an exemplary embodiment of the present invention, the calculating a flow field around the ship according to the wave model and the computational domain grid, and obtaining the pressure distribution of the surface of the ship includes:
selecting an Euler multiphase flow model to establish an air phase and a water phase according to the wave model and the set parameters;
setting the boundary of the ship in a background area and a foreground area by combining the air phase and the water phase according to the computational domain grid;
simulating the wave raising slamming process of the ship according to the set boundary wave making to obtain an initial wave;
and updating the set parameters, and iterating according to the updated set parameters to carry out boundary wave generation to generate different waves so as to obtain the pressure distribution on the surface of the ship.
In an exemplary embodiment of the invention, the meshing the hull for the ship model, and the generating the hull mesh includes:
setting ship materials and material properties for the ship model;
calculating a field of the ship external flow field inhibition calculation according to the ship material and the material attribute, and only carrying out grid division on a ship body in a ship model;
and carrying out encryption processing on the underwater part of the ship body to obtain the ship body grid.
In an exemplary embodiment of the present invention, the performing structural strength analysis on the ship by using the stress and deformation data analyzed by the plurality of different wave models to obtain the analysis result of fluid-solid coupling includes:
carrying out tests and simulation by utilizing various different wave models to obtain various wave slamming scenes;
and carrying out ship structure strength analysis on the stress and deformation data in the various wave-rising slamming scenes, wherein the ship structure strength analysis comprises a free liquid level form distribution state, slamming pressure, structural deformation and a stress strain distribution state when the ship body slams, and analyzing the periodic change of the pressure and the speed according to the stress change of the ship body to obtain a fluid-solid coupling analysis result.
The invention also provides a simulation-based upper wave slamming ship fluid-solid coupling analysis system, which comprises:
the external flow field meshing module is used for importing a ship model, setting an external flow field calculation domain of a ship, and meshing the external flow field calculation domain to generate a calculation domain mesh;
the wave model module is used for selecting a corresponding wave model according to the given navigation sea area of the ship;
the flow field calculation module is used for calculating the flow field around the ship according to the wave model and the calculation domain grid to obtain the pressure distribution on the surface of the ship;
the ship body mesh division module is used for carrying out ship body mesh division on the ship model to generate ship body meshes;
the static structure analysis module is used for combining the pressure distribution and introducing fluid load according to the ship body grids, and performing static structure analysis to obtain stress and deformation data;
and the structural strength analysis module is used for analyzing the structural strength of the ship by utilizing the stress and deformation data analyzed by various different wave models to obtain the fluid-solid coupling analysis result.
(III) advantageous effects
The invention has the beneficial effects that: the simulation-based upper wave slamming and lower ship fluid-solid coupling analysis method and system provided by the embodiment of the invention generate upper wave slamming phenomena under various sea conditions by using a simulation technology, and are more in line with actual sea conditions; the method is used for simulating the wave-facing motion of the ship in irregular waves, and by changing wave parameters, the fluid-solid coupling analysis of the ship in different wave scenes is respectively carried out, the motion rule and the structural deformation effect of the ship under different slamming loads are researched, and the numerical analysis of the fluid-solid coupling of the air-sea water-ship in the real wave slamming process is simulated.
Drawings
Fig. 1 is a flowchart of a simulation-based fluid-solid coupling analysis method for a ship slamming on waves and crashing down according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating step S130 of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating step S140 of FIG. 1 according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a ship fluid-solid coupling analysis process for implementing the method on a workbench simulation platform in an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the structure and data flow of the fluid-solid coupling module according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a ship model according to an embodiment of the invention;
FIG. 7 is a diagram illustrating an outer flow field computational domain after meshing in accordance with an embodiment of the present invention;
fig. 8 is a schematic diagram of a simulation-based upper wave slamming ship fluid-solid coupling analysis system according to another embodiment of the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Aiming at the problem that the numerical simulation method in the prior art is difficult to simulate the fluid-solid coupling of air-sea water-ship in the real wave slamming process, the invention provides a simulation-based upper wave slamming lower ship fluid-solid coupling analysis method, which can simulate various upper wave slamming scenes, and analyze the structural slamming load characteristic and the structural stress strain distribution characteristic according to the analysis result of fluid-solid coupling of ship body slamming load and ship body slamming motion response on the basis of different wave scenes.
Fig. 1 is a flowchart of a simulation-based fluid-solid coupling analysis method for a ship slamming on a wave, according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
as shown in fig. 1, in step S110, a ship model is imported, an external flow field calculation domain of a ship is set, and a calculation domain mesh is generated by performing mesh division on the external flow field calculation domain;
as shown in fig. 1, in step S120, a corresponding wave model is selected according to a given navigation sea area of the ship;
as shown in fig. 1, in step S130, performing a ship surrounding flow field calculation by combining the computation domain grid according to the wave model to obtain a pressure distribution on the surface of the ship;
as shown in fig. 1, in step S140, hull meshes are generated by performing hull mesh division on the ship model;
as shown in fig. 1, in step S150, performing static structure analysis according to the pressure distribution and the fluid load introduced by the hull mesh, and obtaining stress and deformation data;
as shown in fig. 1, in step S160, the structural strength of the ship is analyzed by using the stress and deformation data analyzed by the plurality of different wave models, so as to obtain the analysis result of fluid-solid coupling.
Based on the method, the wave-raising slamming phenomenon under various sea conditions is generated by utilizing a simulation technology, and the method is more in line with the actual sea conditions; the method is used for simulating the wave-facing motion of the ship in irregular waves, and by changing wave parameters, the fluid-solid coupling analysis of the ship in different wave scenes is respectively carried out, the motion rule and the structural deformation effect of the ship under different slamming loads are researched, and the numerical analysis of the fluid-solid coupling of the air-sea water-ship in the real wave slamming process is simulated.
In step S110, a ship model is imported, an external flow field calculation domain of the ship is set, and a calculation domain mesh is generated by performing mesh division on the external flow field calculation domain.
In an embodiment of the present invention, before importing the ship model, the method further includes: and establishing a fluid-solid coupling analysis module.
In an exemplary embodiment of the present invention, the step of setting the out-flow field calculation domain of the ship comprises: setting an upper boundary, a lower boundary, a left boundary, a right boundary, a front boundary and a rear boundary of the out-flowing field calculation domain based on the size of the ship, specifically:
the distance from the upper boundary to a ship deck is set to be 1 time of ship length, the distance from the lower boundary to the lowest position of the lower surface of the ship is 1 time of ship length, the distances from the left boundary and the right boundary to a ship board are both 1 time of ship length, the distance from the front boundary to a ship bow is 1.5 times of ship length, and the distance from the rear boundary to a ship stern is 1.5 times of ship length.
In an exemplary embodiment of the present invention, the step of meshing the computation domain of the external flow field, and generating the computation domain mesh includes:
and the same grid setting is adopted for the overlapped part of the foreground grid and the background grid, and the grids around the ship are encrypted.
In step S120, a corresponding wave model is selected according to a given navigation sea area of the ship.
In an exemplary embodiment of the present invention, before the step of selecting the corresponding wave model according to the given sailing sea area of the ship, the method further includes:
and aiming at wave classification in different sea area ranges, establishing wave model databases of different sea areas according to different parameters of frequency, wave height, wave speed, phase and wave spectrum of sea conditions in the sea areas.
After a wave model database is obtained, firstly, determining a given navigation sea area, and acquiring wave data within the range of the given navigation sea area; then, classifying according to the wave data to obtain a classification result; and finally, corresponding to the classification result and the wave classification in the wave model database to obtain a wave model corresponding to the given navigation sea area.
Based on the above, in step S120, the navigation sea area of the ship is determined, the wave data of the sea area is classified and sorted according to the navigation sea area, and an appropriate wave model is further selected for wave slamming analysis.
In step S130, the flow field around the ship is calculated by combining the calculation domain grid according to the wave model, so as to obtain the pressure distribution on the surface of the ship.
Fig. 2 is a flowchart of step S130 in fig. 1 according to an embodiment of the present invention, which is as follows:
as shown in fig. 2, in step S210, an euler multiphase flow model is selected to establish an air phase and a water phase according to the wave model and the set parameters;
as shown in fig. 2, in step S220, the boundary of the ship is set in the background region and the foreground region according to the computational domain grid and by combining the air phase and the water phase;
as shown in fig. 2, in step S230, a simulation of the wave-raising slamming process of the ship is implemented according to the set boundary wave-making, so as to obtain an initial wave condition;
as shown in fig. 2, in step S240, the setting parameters are updated, and boundary wave generation is performed iteratively according to the updated setting parameters, so as to generate different waves and obtain the pressure distribution on the surface of the ship.
Based on the steps shown in fig. 2, the pressure distribution of the surface of the ship is obtained and used for the user to perform the subsequent static structure analysis.
In step S140, hull meshes are generated by performing hull mesh division on the ship model.
Fig. 3 is a flowchart of step S140 in fig. 1 according to an embodiment of the present invention, which is as follows:
as shown in fig. 3, in step S310, a ship material and a material property are set for the ship model;
as shown in fig. 3, in step S320, the outer flow field calculation domain is suppressed, and only the hull in the ship model is gridded;
as shown in fig. 3, in step S330, the underwater part of the hull is encrypted to obtain the hull mesh.
In step S150, a fluid load is introduced according to the pressure distribution of the hull mesh, and a static structural analysis is performed to obtain stress and deformation data.
In step S160, the structural strength of the ship is analyzed by using the stress and deformation data analyzed by the various wave models, so as to obtain the analysis result of fluid-solid coupling.
In an exemplary embodiment of the invention, this step is first tested and simulated using a variety of different wave models, resulting in a variety of wave slamming scenarios; and then, carrying out ship structure strength analysis on the stress and deformation data in the various wave-rising slamming scenes, wherein the ship structure strength analysis comprises a free liquid level form distribution state, slamming pressure, structural deformation and a stress strain distribution state when the ship body slams, and analyzing the periodic change of the pressure and the speed according to the stress change of the ship body to obtain a fluid-solid coupling analysis result.
The following describes in detail the specific implementation of each step of the embodiment shown in fig. 1, taking as an example the implementation of the above method on a workbench simulation platform:
fig. 4 is a schematic diagram of a ship fluid-solid coupling analysis process for implementing the method on a workbench simulation platform in an embodiment of the present invention, and as shown in fig. 4, the following description is provided:
(1) and establishing a Fluid Solid Interface (FSI) module in the workbench.
In the embodiment, the hull of the whole ship is taken as a research object, the influence of an appendage and a propeller on a surrounding flow field is ignored according to research needs, after a ship three-dimensional model is established, a fluid-solid coupling module is established in a workbench, namely, pressure is transmitted to a solid computer by fluid computer, and node displacement is returned to the fluid program by the solid computer to update the flow field. Fig. 5 is a schematic diagram illustrating the structure and data flow of the fluid-solid coupling module according to an embodiment of the present invention, and as shown in fig. 5, after each step is completed, the file does not need to be stored and opened, and the data of the previous module is automatically transmitted to the next module for processing.
Then, a ship model is introduced into the Geometry shown in fig. 5, and fig. 6 is a schematic diagram of the ship model in an embodiment of the present invention. After the ship model is imported, firstly, an external flow field calculation domain is set, the size of the external flow field calculation domain is related to the size of a ship, and in order to reduce the influence of the boundary of the flow field calculation domain on the flow field around the ship, the distance from the upper boundary of the flow field to a deck of the ship is set to be 1 time of ship length, the distance from the lower boundary of the flow field to the lowest part of the lower surface of a ship body is set to be 1 time of ship length, the distance from the left boundary to the ship board is set to be 1 time of ship length, the distance from the right boundary to the ship board is set to be 1.5 times of ship length. The origin of the coordinate system is positioned at the intersection point of the vertical line of the stern and the bottom of the ship, the X axis points to the bow along the ship length, the Z axis is vertically upward, and the right-hand rectangular coordinate system is met.
(2) Mesh partitioning
Based on the steps, the outer flow field calculation domain is subjected to mesh division, and the ship body is restrained in a mesh division module (Meshing). The grid division adopts an overlapped grid method without grid reconstruction to set an external flow field calculation domain, and the grid generation is carried out in the external flow field calculation domain by adopting shell grid generation, prism grid stretching, boundary layer grids and a mixed grid method. In order to reduce the influence of the overlapped grid part on the calculation result, the overlapped parts of the foreground grid and the background grid adopt the same grid arrangement, and the grids around the ship are encrypted in order to accurately capture the flow field information of the flow field around the ship, and fig. 7 is a schematic diagram of the outer flow field calculation domain grid division in one embodiment of the invention.
(3) Creating a wave model database
In this embodiment, sea areas are used as a classification standard, and on the basis of collecting a large amount of wave actual measurement data, data are classified and counted to determine the frequency, wave height, wave velocity, phase and parameters required by different wave spectrums of sea conditions in different sea areas, and the parameters are compiled into a User Defined Function (UDF) available to Fluent. Each sea state of each sea area corresponds to one UDF file, a programming tool is utilized to establish wave model databases of different sea areas, and wave model data corresponding to the sea areas can be selected according to a key-value table look-up form. After the corresponding wave model is selected according to the given navigation sea area of the ship, the wave model can be automatically compiled into a Fluent readable UDF file through a programming tool for wave making processing in Fluent.
(4) Flow field calculation around ship in Fluent
After compiling of a user-defined function of the wave model is completed, modeling and necessary parameter setting are carried out on a calculation model, an air phase and a water phase are established by using a multi-phase flow model based on a VOF (volume of fluid) method, an initial free liquid level is set according to ship design draft, the fluid and the gravity action of a ship are considered by using a gravity model, and an RNG k-epsilon model is adopted by a turbulence model.
In this embodiment, according to the research purpose, the boundaries of the background area are respectively set as follows: the boundary of the ship bow is set as a velocity-entrance (velocity-entrance), the boundary of the ship stern and the boundary of the ship deck are set as free outflow (outflow), the rest outer boundary is set as a non-slip wall (wall), and the inner boundary is set as an overlapping surface (overlay-interface). The boundary of the foreground region is set as follows: the outer boundaries are all set to be overlapped surfaces (overjet-interface), and the surface of the ship body is set to be a non-slip wall surface (wall). The process of wave slamming is implemented using boundary wave making, loading UDF files directly derived from the wave model database at the velocity entry for initial wave input. And setting the calculation step length to be 0.01s, setting the iteration times to be 1000 steps, and calculating after the setting is finished. After the calculation is finished, Fluent can obtain the pressure distribution of the ship surface, does not need to output data, and can directly transmit the pressure distribution to a Static Structural analysis (Static Structural) module for Static Structural analysis.
(5) Hull meshing
After the calculation of the outflowing field is finished, ship materials are set, material attributes are set, materials can be added from a material library or new materials can be customized, the calculation domain of the outflowing field is restrained in the meshing process, only the ship body is meshed, the meshing is carried out in a meshing module, the maximum mesh size and the mesh type are set, meshes adaptive to the ship body can be automatically generated, and the underwater part of the ship body is encrypted according to actual conditions.
(6) Static Structural analysis (Static Structural)
In the embodiment, in the Pressure distribution condition obtained by inserting Static Structural into Fluent, a load (imported load) is clicked, insert-Pressure is right clicked, a ship is selected, a surface corresponding to a ship body is selected from CFD surface options, solution is clicked to load the surface Pressure generated by Fluent, and a constraint Point Fixed Point is inserted to constrain the bottom surface of the ship. After the analysis conditions are loaded, inserting a result item, right clicking solution, selecting a string-Equivalent (Equivalent stress), and selecting all the hulls. Then, the equivalent stress of the specified mechanism is inserted by the same steps; right-clicking solution, selecting the Deformation-Total (structural Deformation), and selecting all the ship hulls; click on the solve and start the calculation. And after calculation, outputting data such as the whole ship equivalent stress, partial structure equivalent stress, structural deformation and the like for carrying out single ship structural strength analysis.
(7) Structural strength analysis of ships
After the primary simulation is completed, the free liquid level form change can be obtained through Fluent, and the output whole-ship equivalent stress, partial structure equivalent stress and structural deformation of the ship body under the wave condition are obtained through static structural. By selecting different wave models in the wave database and performing the test in the same procedure, results under a variety of wave slamming conditions can be obtained. And establishing a ship performance database with the wave condition as an independent variable according to multiple simulation results, analyzing the free liquid level form distribution condition, slamming pressure, structural deformation and stress strain distribution state when the ship body slams, observing the stress change of the ship body, and analyzing the periodic change of the pressure and the speed.
(8) Saving engineering documents
The engineering file is saved to generate a fixed upper wave slamming and lower ship fluid-solid coupling analysis flow model which can be used for upper wave slamming and fluid-solid coupling analysis of other ships, so that the simulation and analysis efficiency is improved, and the possibility of simulation errors caused by misoperation in the analysis process is reduced.
In summary, the simulation-based flow-solid coupling analysis method for the ship under the wave slamming provided by the embodiment of the invention establishes the wave model database for Fluent wave generation according to the wave statistical data of different sea areas, can directly generate different waves according to the given navigation sea area of the ship, is used for wave slamming simulation under various scenes, better accords with actual sea conditions, simplifies the process and improves the simulation efficiency. The digital simulation technology is utilized to simulate the wave-facing motion condition of the ship in irregular waves, the fluid-solid coupling analysis of the ship under different wave scenes is respectively carried out by changing wave parameters, the motion rule and the structural deformation effect of the ship under different slamming loads are researched, so that the fluid-solid coupling simulation is carried out on the whole ship, the safety is high, the test period is short, the repeatability is strong, and the speed of research and development and the optimization period of the ship are accelerated.
Corresponding to the above method, the present invention further provides a simulation-based upper wave slamming and lower ship fluid-solid coupling analysis system, and fig. 8 is a schematic diagram of a simulation-based upper wave slamming and lower ship fluid-solid coupling analysis system provided in another embodiment of the present invention, as shown in fig. 8, the system 800 includes: an external flow field meshing module 810, a wave model module 820, a flow field calculation module 830, a hull meshing module 840, a static structure analysis module 850, and a structural strength analysis module 860.
The external flow field meshing module 810 is used for importing a ship model, setting an external flow field calculation domain of a ship, and meshing the external flow field calculation domain to generate a calculation domain mesh; the wave model module 820 is used for selecting a corresponding wave model according to a given navigation sea area of the ship; the flow field calculation module 830 is configured to perform flow field calculation around the ship according to the wave model in combination with the computational domain grid to obtain pressure distribution on the surface of the ship; the hull meshing module 840 is configured to perform hull meshing on the ship model to generate hull meshes; the static structure analysis module 850 is used for analyzing a static structure according to the pressure distribution and the introduced fluid load of the hull grids to obtain stress and deformation data; the structural strength analysis module 860 is configured to perform ship structural strength analysis by using the stress and deformation data analyzed by the multiple different wave models to obtain an analysis result of fluid-solid coupling.
For details which are not disclosed in the embodiments of the apparatus of the present disclosure, reference is made to the embodiments of the method of the present disclosure for details which are not disclosed in the embodiments of the apparatus of the present disclosure, since the functional modules of the system of the exemplary embodiment of the present disclosure correspond to the steps of the exemplary embodiment of the method illustrated in fig. 1 described above.
In summary, the technical effects of the simulation-based ship fluid-solid coupling analysis system provided by the embodiment of the present disclosure refer to the technical effects of the above method, and are not described herein again.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiment of the present invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A simulation-based flow-solid coupling analysis method and system for a ship slamming on wave is characterized by comprising the following steps:
importing a ship model, setting an outer flow field calculation domain of a ship, and performing grid division on the outer flow field calculation domain to generate a calculation domain grid;
selecting a corresponding wave model according to a given navigation sea area of the ship;
calculating a flow field around the ship by combining the calculation domain grid according to the wave model to obtain the pressure distribution on the surface of the ship;
dividing the ship body grids aiming at the ship model to generate ship body grids;
combining the pressure distribution and introducing fluid load according to the hull grids, and performing static structure analysis to obtain stress and deformation data;
and (4) carrying out ship structure strength analysis by utilizing the stress and deformation data analyzed by various different wave models to obtain a fluid-solid coupling analysis result.
2. The simulation-based up-wave slamming ship fluid-solid coupling analysis method of claim 1, wherein before introducing the ship model, further comprising:
and building a fluid-solid coupling analysis module.
3. The simulation-based wave slamming vessel fluid-solid coupling analysis method of claim 1, wherein setting the out-flow field computation domain of the vessel comprises:
setting an upper boundary, a lower boundary, a left boundary, a right boundary, a front boundary, and a rear boundary of the out-flow field computation domain based on the size of the vessel;
the distance from the upper boundary to a ship deck is set to be 1 time of ship length, the distance from the lower boundary to the lowest position of the lower surface of the ship is 1 time of ship length, the distances from the left boundary and the right boundary to a ship board are both 1 time of ship length, the distance from the front boundary to a ship bow is 1.5 times of ship length, and the distance from the rear boundary to a ship stern is 1.5 times of ship length.
4. The simulation-based up-wave slamming ship fluid-solid coupling analysis method of claim 1, wherein the gridding the outer flow field computation domain to generate a computation domain grid comprises:
and the same grid setting is adopted for the overlapped part of the foreground grid and the background grid, and the grids around the ship are encrypted.
5. The method of claim 1, wherein before selecting the corresponding wave model based on the given sailing sea of the ship, the method further comprises:
and aiming at wave classification in different sea area ranges, establishing wave model databases of different sea areas according to different parameters of frequency, wave height, wave speed, phase and wave spectrum of sea conditions in the sea areas.
6. The simulation-based up-wave slamming ship fluid-solid coupling analysis method of claim 5, wherein the selecting the corresponding wave model according to the given sailing sea area of the ship comprises:
determining a given navigation sea area, and acquiring wave data within the given navigation sea area;
classifying according to the wave data to obtain a classification result;
and according to the classification result, corresponding to the wave classification in the wave model database to obtain a wave model corresponding to the given navigation sea area.
7. The simulation-based up-wave slamming ship fluid-solid coupling analysis method of claim 3, wherein the calculating the flow field around the ship according to the wave model and the computational domain grid to obtain the pressure distribution of the surface of the ship comprises:
selecting an Euler multiphase flow model to establish an air phase and a water phase according to the wave model and the set parameters;
setting the boundary of the ship in a background area and a foreground area by combining the air phase and the water phase according to the computational domain grid;
simulating the wave raising slamming process of the ship according to the set boundary wave making to obtain an initial wave;
and updating the set parameters, and iterating according to the updated set parameters to carry out boundary wave generation to generate different waves so as to obtain the pressure distribution on the surface of the ship.
8. The simulation-based up-wave slamming ship fluid-solid coupling analysis method of claim 1, wherein the meshing the ship hull for the ship model, generating the ship hull mesh comprises:
setting ship materials and material properties for the ship model;
calculating a field of the ship external flow field inhibition calculation according to the ship material and the material attribute, and only carrying out grid division on a ship body in a ship model;
and carrying out encryption processing on the underwater part of the ship body to obtain the ship body grid.
9. The method according to claim 8, wherein the analyzing the structural strength of the ship using the stress and deformation data of the plurality of different wave model analyses to obtain the fluid-solid coupling analysis result comprises:
carrying out tests and simulation by utilizing various different wave models to obtain various wave slamming scenes;
and carrying out ship structure strength analysis on the stress and deformation data in the various wave-rising slamming scenes, wherein the ship structure strength analysis comprises a free liquid level form distribution state, slamming pressure, structural deformation and a stress strain distribution state when the ship body slams, and analyzing the periodic change of the pressure and the speed according to the stress change of the ship body to obtain a fluid-solid coupling analysis result.
10. A simulation-based up-wave slamming ship fluid-solid coupling analysis system is characterized by comprising:
the external flow field meshing module is used for importing a ship model, setting an external flow field calculation domain of a ship, and meshing the external flow field calculation domain to generate a calculation domain mesh;
the wave model module is used for selecting a corresponding wave model according to the given navigation sea area of the ship;
the flow field calculation module is used for calculating the flow field around the ship according to the wave model and the calculation domain grid to obtain the pressure distribution on the surface of the ship;
the ship body mesh division module is used for carrying out ship body mesh division on the ship model to generate ship body meshes;
the static structure analysis module is used for combining the pressure distribution and introducing fluid load according to the ship body grids, and performing static structure analysis to obtain stress and deformation data;
and the structural strength analysis module is used for analyzing the structural strength of the ship by utilizing the stress and deformation data analyzed by various different wave models to obtain the fluid-solid coupling analysis result.
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