CN114757124A - CFD workflow modeling method and device based on XML, computer and storage medium - Google Patents
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Abstract
A CFD workflow modeling method, a device, a computer and a storage medium based on XML relate to the field of scientific computing. The problem that the existing scientific computing workflow is not suitable for hydromechanics is solved. The modeling method comprises the following steps: acquiring an input parameter file according to the analyzed XML file; performing geometric modeling according to the input parameter file to obtain a geometric model file, wherein the geometric model file is the output attribute of a geometric component node model; mesh generation is carried out according to the geometric model, and a mesh file is obtained, wherein the mesh file is the output attribute of a mesh component node model; performing solving calculation according to the input parameter file and the grid file to obtain a solving result, wherein the solving result is an output attribute of a node model of the solver component; acquiring a post-processing rendering image according to the solving result, and completing establishment of a CFD workflow model; and the post-processing rendering image is an output attribute of the post-processing component node model. The method is suitable for the field of scientific computing workflow of fluid mechanics.
Description
Technical Field
The invention relates to the technical field of fluid simulation in the technical field of fluid mechanics.
Background
The scientific computing workflow provides functions of flow definition and control, task management, job scheduling and execution, fault-tolerant processing and the like, shields underlying resources, helps scientific researchers reduce time cost of deployment operation and the like of the flow, and improves the efficiency of solving problems. Typical scientific workflow systems such as Kepler (Kepler) and the like take a lot of time to become familiar with the meanings of various active nodes in application, while other integration methods such as HSWAP (numerical simulation workflow management platform suitable for high-performance computing environment) do not analyze and summarize the data coupling mode thereof aiming at the field of CFD (computational fluid dynamics), and the integration method based on STEP (product model data interaction specification) and the integration method based on Agent (proxy) architecture have defects in expansibility.
At present, a scientific computing workflow applicable to the field of fluid mechanics, namely a fluid simulation modeling technology applicable to fluid mechanics, is lacked.
Disclosure of Invention
The invention solves the problem that the existing scientific computing workflow is not suitable for hydromechanics.
A CFD workflow modeling method based on XML, the modeling method comprising:
acquiring an input parameter file according to the analyzed XML file;
performing geometric modeling according to the input parameter file to obtain a geometric model file, wherein the geometric model file is the output attribute of a geometric component node model;
mesh generation is carried out according to the geometric model, and a mesh file is obtained, wherein the mesh file is the output attribute of a mesh component node model;
performing solving calculation according to the input parameter file and the grid file to obtain a solving result, wherein the solving result is an output attribute of a node model of a solver component;
acquiring a post-processing rendering image according to the solving result, and completing the establishment of a CFD workflow model; and the post-processing rendering image is an output attribute of the post-processing component node model.
Further, the geometric component node model, the grid component model, the solver node model and the post-processing component node model all include: object properties, execution actions, and object ports;
the object attribute is used for describing relevant parameters of the workflow node;
the execution action is used for describing a behavior action of the workflow node;
the object port is used for describing data input and data output of the workflow node, the data input represents that data required by the workflow node is input through the input port, and the data output represents that data generated by the workflow node is transmitted to the next node through the output port.
Further, the CFD workflow model includes a root element;
the root element includes three attributes: a name attribute, a desp attribute, and a type attribute;
the name attribute is used for describing the name of the workflow model;
the desp attribute is used for describing information of the workflow model and providing explanatory characters of the workflow model;
the type attribute is used to describe the type of the workflow model.
Further, the root element also includes four sub-elements: property, Step, relationship and Link;
the Property of the child element is used for describing the Property information of the workflow model;
the child element Step is used for describing node information in the workflow model, the workflow model at least comprises two child elements Step for describing workflow nodes, and the two child elements Step are respectively a start node and an end node;
the sub-element relationship is used for describing the connection information of each node in the workflow model and has no direction attribute;
the sub-element Link is used for associating input ports and output ports between nodes.
Further, the child element Property includes:
child element Author, child element CreateTime, child element Location;
the child element Author is used for explaining the Author of the workflow model;
the child element CreateTime is used for explaining the creation time of the workflow model;
the child element Location is used to specify the Location of the workflow model storage.
Further, the sub-element Step includes: attribute name, attribute desp, attribute id and attribute type;
the attribute name is used for explaining the name of the node corresponding to the child element Step, and in the whole workflow model, the name of the node is unique and can not be repeated;
the attribute desp is used for explaining the description information of the node corresponding to the sub-element Step and providing descriptive characters of the corresponding node;
the attribute id is used as an identifier to identify the node;
the attribute type is used for explaining the type of the workflow node and determining the work content of the workflow node.
Further, the sub-element Step further includes: the child element label Property of the node label, the child element label Actions of the node label and the child element label Ports of the node label;
the child element label Property of the node label is used for describing attribute information contained in the node class;
the child element tag Actions of the node tag are used to describe the set of all operations supported by the node;
the child element labels Ports of the node label are used to represent the path of the input data to the node, and the path of the output data from the node.
Based on the same conception, the invention also provides a CFD workflow modeling device based on XML, which comprises:
the analysis unit is used for acquiring an input parameter file according to the analysis XML file;
the geometric modeling unit is used for carrying out geometric modeling according to the input parameter file to obtain a geometric model file, and the geometric model file is the output attribute of the geometric component node model;
the grid file acquisition unit is used for carrying out grid subdivision according to the geometric model and acquiring a grid file, wherein the grid file is the output attribute of a grid component node model;
the solving result obtaining unit is used for carrying out solving calculation according to the input parameter file and the grid file to obtain a solving result, and the solving result is the output attribute of the node model of the solver component;
the post-processing unit is used for acquiring a post-processing rendering image according to the solving result and completing the establishment of a CFD workflow model; and the post-processing rendering image is an output attribute of the post-processing component node model.
The invention also provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the method for modeling the CFD workflow based on the XML.
The present invention also provides a computer readable storage medium for storing a computer program, which executes the above-mentioned CFD workflow modeling method based on XML.
The invention has the advantages that:
(1) the invention defines a set of semantic grammar specifications based on XML extensible markup language, constructs scientific computing workflow facing the technical field of fluid mechanics, and forms a set of formalized CFD model establishing and describing methods.
(2) The nodes of a typical scientific workflow formal description language are complex, a large amount of time is spent on familiarizing the meanings of various active nodes, and the semantic grammar specification based on the XML focuses on a model for describing the space physical characteristics of fluid motion and the space-time physical characteristics of unsteady fluid motion, and the model is more suitable for operation and use.
(3) The invention provides a special component oriented to the technical field of fluid mechanics, which comprises business nodes such as geometry, grids, a solver, post-processing and the like, wherein the established CFD workflow model can integrate the existing scientific calculation tasks developed by multiple languages; the method supports integrity, logic and consistency check, realizes static check of the workflow, finds errors in advance and reduces error checking time during the operation of the workflow.
(4) The modeling method constructed based on the invention can develop the user-defined workflow component, expand and encapsulate the logic of the user, and the whole workflow can be well compatible and support the calling of the user-defined component, thereby being convenient for the user to use.
The method is suitable for the field of scientific computing workflow of fluid mechanics.
Drawings
Fig. 1 is a flowchart of a CFD workflow modeling method based on XML according to the present invention.
Fig. 2 is a flowchart of a determining component according to a sixth embodiment of the present invention.
Fig. 3 is a flowchart of a loop component according to a sixth embodiment of the present invention.
Fig. 4 is a schematic diagram of a workflow model description file according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
First embodiment this embodiment is described with reference to fig. 1. The CFD workflow modeling method based on XML according to this embodiment includes:
acquiring an input parameter file according to the analyzed XML file;
performing geometric modeling according to the input parameter file to obtain a geometric model file, wherein the geometric model file is an output attribute of a geometric component node model;
mesh generation is carried out according to the geometric model, and a mesh file is obtained, wherein the mesh file is the output attribute of a mesh component node model;
performing solving calculation according to the input parameter file and the grid file to obtain a solving result, wherein the solving result is an output attribute of a node model of a solver component;
acquiring a post-processing rendering image according to the solving result, and completing establishment of a CFD workflow model; and the post-processing rendering image is an output attribute of the post-processing component node model.
In practical application, the geometric component node model is internally packaged with operation and data configuration items which are common in the geometric modeling stage in the scientific computing field, so that input data and output data related to geometric modeling are conveniently operated; common operation and data configuration items in a mesh generation stage in the field of scientific computing are packaged in the mesh component node model, and mesh generation operation on a geometric model can be provided; common operation and data configuration items in a finite element solution computing stage in the field of scientific computing are packaged in the solver node model, and a solution computing process aiming at an input parameter file and a grid file can be provided; the post-processing component node model encapsulates common operation and data configuration items in a post-processing visualization stage in the field of scientific computing, and common post-processing rendering images such as cloud pictures, vector diagrams, isosurfaces and the like can be presented on a computing result file output by a solver through a visualization technical means (calling of common software).
Each basic component node model is defined in the form of C + + class and is used as a basic component node object. The workflow model frame part supports the extension of the basic component model, is embodied as inheritance of the basic component class in actual operation, writes out the finally needed subclass type by integrating different types of basic component classes, and can be displayed together with the basic component after being loaded in the frame.
The basic component model and the extension component model based on the basic component model can be realized by packaging a Widget interface, and the Widget interface part mainly realizes the collection work of the node attribute information.
In a second embodiment, the present embodiment is further limited to the method for modeling a CFD workflow based on XML according to the first embodiment, where the geometric component node model, the grid component node model, the solver node model, and the post-processing component node model all include: object properties, execution actions, and object ports;
the object attribute is used for describing relevant parameters of the workflow node;
the execution action is used for describing a behavior action of the workflow node;
the object port is used for describing data input and data output of the workflow node, the data input represents that data required by the workflow node is input through the input port, and the data output represents that data generated by the workflow node is transmitted to the next node through the output port.
In practical applications, the relevant parameters may be node state information, input parameter information, output parameter information, intermediate result data, and the like.
The execution animals are specifically front-mounted actions before entering the workflow nodes, node actions after entering the workflow nodes, rear-mounted actions after leaving the workflow nodes and the like; the three types of actions can be expressed in a python script or a Shell script, and are specifically executed and processed in an execution engine.
The object port can access the data required by the node through the input port, and can also transmit the data generated by the node to the next node through the output port. A port is a data transmission channel between nodes, wherein transmitted data is realized by binding node object properties.
The third embodiment is a further limitation on the CFD workflow modeling method based on XML according to the second embodiment, where the CFD workflow model includes a root element;
the root element includes three attributes: a name attribute, a desp attribute, and a type attribute;
the name attribute is used for describing the name of the workflow model;
the desp attribute is used for describing information of the workflow model and providing explanatory characters of the workflow model;
the type attribute is used to describe the type of the workflow model.
The details of the 3 attributes are shown in table 1:
TABLE 1
In practical applications, the workflow node description file is embodied in the form of XML.
In a fourth embodiment, the present embodiment is a further limitation on the CFD workflow modeling method based on XML according to the third embodiment, and the root element further includes four sub-elements: property, Step, relationship and Link;
the Property of the child element is used for describing the Property information of the workflow model;
the child element Step is used for describing node information in the workflow model, the workflow model at least comprises two child element steps for describing workflow nodes, and the two child element steps are respectively a starting node and an ending node;
the sub-element relationship is used for describing the connection information of each node in the workflow model and has no direction attribute;
the sub-element Link is used to associate input and output ports between nodes.
The details of the sub-element relationship are shown in Table 2:
TABLE 2
The sub-element Link can reflect the association relationship of the input port and the output port of each other among the nodes having the connection relationship. Generally, a connection line is associated with two nodes, one of which is an input port of one node and the other of which is an output port of the other node.
The detailed description of the sub-element Link is shown in table 3:
TABLE 3
Example five this example is illustrated with reference to fig. 4. This embodiment is a further limitation to the CFD workflow modeling method based on XML according to the fourth embodiment, where the child element Property includes:
child element Author, child element CreateTime, child element Location;
the child element Author is used for explaining the Author of the workflow model;
the child element CreateTime is used for explaining the workflow model creation time;
the child element Location is used to specify the Location of the workflow model storage.
In practical use, the detailed description of the child element Property is shown in table 4:
TABLE 4
Sixth embodiment this embodiment is described with reference to fig. 2, 3 and 4. This embodiment is a further limitation to the CFD workflow modeling method based on XML according to the fourth embodiment, where the child element Step includes: attribute name, attribute desp, attribute id and attribute type;
the attribute name is used for explaining the name of the node corresponding to the child element Step, and in the whole workflow model, the name of the node is unique and can not be repeated;
the attribute desp is used for explaining the description information of the node corresponding to the sub-element Step and providing descriptive characters of the corresponding node;
the attribute id is used as an identifier to identify the node;
the attribute type is used for explaining the type of the workflow node and determining the work content of the workflow node.
In practical applications, the attribute type includes 12 basic component types, which are: the start node WFBeginStep, the geometry node WFGeoStep, the grid node WFMeshStep, the solution node WFSolverStep, the post-processing node WFPostStep, the conditional branch node WFCondidionStep, the loop node WFLoopStep, the parallel start node WFParalBeginStep, the parallel end node WFParalEndStep, the custom node WFCustometep, and the end node WFEndStep.
The geometric node WFGeoStep, the grid node WFMeshStep, the solving node WFSolverStep and the post-processing node WFPostStep are service nodes.
In actual use, at least one start node WFBeginStep and an end node WFEndStep are contained in a workflow description file to describe the workflow nodes.
The parallel start node WFParalBeginStep and the parallel end node WFParalEndStep are used for improving the calculation efficiency by two branch flows in the optimized design flow service and performing calculation by starting n sub-flows in parallel (n is an integer greater than or equal to 1). The calculation process of each sub-process is the same, and the calculation data of each sub-process are not interfered with each other; the flow defined between the parallel start node and the parallel end node is a sub-flow which needs to be started in parallel, and the parallel start node and the parallel end node need to be in one-to-one correspondence.
The details of the parallel-initiated sub-process are shown in table 5:
TABLE 5
The CFD scientific calculation only allows one start node and one end node, when a plurality of branches appear in the operation process, all branch flows need to be collected to a main flow before ending, and the node for collecting the branch flows is a convergence node WFAndOrStep which is also called an AND node; the details of the sink node WFAndOrStep are shown in table 6:
TABLE 6
In the operation process, which branch flow is taken is determined according to the operation result. The conditional branch node has one more condition judgment action than other nodes, a Result attribute is returned after a program/script executed in the condition judgment action is executed, the system judges which branch is taken according to the Result attribute, and the judgment node is a WFConditionStep conditional branch node; the WFConditionStep conditional branch node specification is shown in table 7:
TABLE 7
In practical applications, a loop node WFLoopStep is used to execute an operation loop n times (n is an integer greater than or equal to 1) according to traffic needs, and the details of the loop node WFLoopStep are shown in table 8:
TABLE 8
When the system allows a user to develop self-defined components by himself, the functional components of the system are expanded. After the user-defined component is loaded into the system, a user can configure a workflow by using the user-defined component to generate a user-defined node WFCustomizeStep; the details of the custom node wfcustomezetep are shown in table 9:
TABLE 9
Seventh embodiment this embodiment is described with reference to fig. 4. This embodiment is a further limitation to the CFD workflow modeling method based on XML according to the fourth embodiment, where the child element Step further includes: the child element label Property of the node label, the child element label Actions of the node label and the child element label Ports of the node label;
the child element label Property of the node label is used for describing the attribute information contained in the node class;
the child element tag Actions of the node tag are used to describe the set of all operations supported by the node;
the child element labels Ports of the node label are used to represent the path of the input data to the node, and the path of the output data from the node.
In actual use, the child element tag Property currently supports two types of child element tags: one is a Param tag, and the Param tag is used for identifying variable data used in the node class; the other is a File tag, which is used to identify the files used in the node class.
The individual attributes of the Param tag are specified as shown in table 10:
TABLE 10
The individual attributes of the File tag are specified in Table 11:
TABLE 11
The Action tag contains a plurality of attribute and sub-element tags, and the detailed description is shown in table 12:
TABLE 12
The child element tag Ports are a collection of node data channels, the child element tag Ports are specified as shown in Table 13:
watch 13
Eighth embodiment, the CFD workflow modeling apparatus based on XML according to the present embodiment includes:
the analysis unit is used for acquiring an input parameter file according to the analysis XML file;
the geometric modeling unit is used for carrying out geometric modeling according to the input parameter file to obtain a geometric model file, and the geometric model file is the output attribute of the geometric component node model;
the grid file acquisition unit is used for carrying out grid subdivision according to the geometric model and acquiring a grid file, wherein the grid file is the output attribute of a grid component node model;
the solving result obtaining unit is used for carrying out solving calculation according to the input parameter file and the grid file to obtain a solving result, and the solving result is the output attribute of the node model of the solver component;
the post-processing unit is used for acquiring a post-processing rendering image according to the solving result and completing the establishment of a CFD workflow model; and the post-processing rendering image is an output attribute of the post-processing component node model.
Ninth embodiment a computer device according to the present embodiment includes a memory and a processor, the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes an XML-based CFD workflow modeling method according to any one of the first to seventh embodiments.
A computer-readable storage medium according to a tenth embodiment of the present invention is a computer-readable storage medium for storing a computer program, the computer program executing the method for modeling a CFD workflow based on XML according to any one of the first to seventh embodiments.
Claims (10)
1. An XML-based CFD workflow modeling method, the modeling method comprising:
acquiring an input parameter file according to the analyzed XML file;
performing geometric modeling according to the input parameter file to obtain a geometric model file, wherein the geometric model file is an output attribute of a geometric component node model;
mesh generation is carried out according to the geometric model, and a mesh file is obtained, wherein the mesh file is the output attribute of a mesh component node model;
performing solving calculation according to the input parameter file and the grid file to obtain a solving result, wherein the solving result is an output attribute of a node model of a solver component;
acquiring a post-processing rendering image according to the solving result, and completing CFD workflow modeling; and the post-processing rendering image is an output attribute of the post-processing component node model.
2. The method of claim 1, wherein the geometric component node model, the mesh component model, the solver node model, and the post-processing component node model each comprise: object attributes, execution actions and object ports;
the object attribute is used for describing relevant parameters of the workflow node;
the execution action is used for describing a behavior action of the workflow node;
the object port is used for describing data input and data output of the workflow node, the data input represents that data required by the workflow node is input through the input port, and the data output represents that data generated by the workflow node is transmitted to the next node through the output port.
3. The method of claim 1, wherein the CFD workflow model comprises a root element;
the root element includes three attributes: a name attribute, a desp attribute, and a type attribute;
the name attribute is used for describing the name of the workflow model;
the desp attribute is used for describing information of the workflow model and providing explanatory characters of the workflow model;
the type attribute is used to describe the type of the workflow model.
4. An XML-based CFD workflow modeling method according to claim 3, wherein said root element further comprises four child elements: property, Step, relationship and Link;
the Property of the child element is used for describing the Property information of the workflow model;
the child element Step is used for describing node information in the workflow model, the workflow model at least comprises two child elements Step for describing workflow nodes, and the two child elements Step are respectively a start node and an end node;
the sub-element relationship is used for describing the connection information of each node in the workflow model and has no direction attribute;
the sub-element Link is used for associating input ports and output ports between nodes.
5. The method of claim 4, wherein the sub-element Property comprises:
child element Author, child element CreateTime, child element Location;
the child element Author is used for explaining the Author of the workflow model;
the child element CreateTime is used for explaining the workflow model creation time;
the child element Location is used to specify the Location of the workflow model storage.
6. The method of claim 4, wherein the child element Step comprises: attribute name, attribute desp, attribute id and attribute type;
the attribute name is used for explaining the name of the node corresponding to the child element Step, and in the whole workflow model, the name of the node is unique and can not be repeated;
the attribute desp is used for explaining the description information of the node corresponding to the sub-element Step and providing descriptive characters of the corresponding node;
the attribute id is used as an identifier to identify the node;
the attribute type is used for explaining the type of the workflow node and determining the work content of the workflow node.
7. The method of claim 4, wherein the child element Step further comprises: the child element label Property of the node label, the child element label Actions of the node label and the child element label Ports of the node label;
the child element label Property of the node label is used for describing the attribute information contained in the node class;
the child element tag Actions of the node tag are used to describe the set of all operations supported by the node;
the child element labels Ports of the node label are used to represent the path of the input data to the node, and the path of the output data from the node.
8. An apparatus for modeling a CFD workflow based on XML, the apparatus comprising:
the analysis unit is used for acquiring an input parameter file according to the analysis XML file;
the geometric modeling unit is used for carrying out geometric modeling according to the input parameter file to obtain a geometric model file, and the geometric model file is the output attribute of the geometric component node model;
mesh division is carried out according to the geometric model, and a mesh file is obtained, wherein the mesh file is the output attribute of a mesh component node model;
performing solving calculation according to the input parameter file and the grid file to obtain a solving result, wherein the solving result is an output attribute of a node model of a solver component;
acquiring a post-processing rendering image according to the solving result, and completing CFD workflow modeling; and the post-processing rendering image is an output attribute of the post-processing component node model.
9. A computer device, characterized by: comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, performs an XML-based CFD workflow modeling method according to any one of claims 1-7.
10. A computer-readable storage medium for storing a computer program for performing an XML-based CFD workflow modeling method according to any one of claims 1 to 7.
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