CN102708247B - Pressure compensation emitter design method based on fluid-solid interaction numerical calculation - Google Patents
Pressure compensation emitter design method based on fluid-solid interaction numerical calculation Download PDFInfo
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Abstract
The invention discloses a pressure compensation emitter design method based on fluid-solid interaction numerical calculation. The method includes: firstly, using CAD (computer aided design) software pro/e to set up a fluid region parameterized geometric model and an elastic diaphragm geometric model in an emitter according to the emitter design requirements; secondly, respectively leading the fluid and diaphragm CAD models into corresponding fluid and structural computing modules in ADINA of CAE (computer aided engineering) software, setting boundary conditions, solving control parameters, and performing fluid-solid interaction numerical calculation; thirdly, properly performing grid reconfiguration during numerical calculation to guarantee quality of calculation grids, fourthly, adjusting geometric model parameters according to calculation results and making a rapidly-formed test part for waterpower performance tests until the calculation results meet the requirement on design precision; and fifthly, comparing test results with the design requirement, correcting the models, or completing the design.
Description
Technical field
The present invention relates to a kind of method for designing of douche, particularly a kind of method of utilizing the solid Coupled Numerical computing technique of stream to realize pressure compensation douche rapid Design
Background technology
Pressure compensation douche can keep the constant of rate of discharge in certain working pressure range, thus make irrigation water stablizing, flow flows out uniformly, reaches the object of science, precision irrigation.Especially to significantly area of variation in water pressure in the aqueduct such as mountain region, hills, pressure compensation douche is used widely owing to having good pressure compensation.Mostly pressure compensation douche on market is to deform under hydraulic pressure by the flexible sheet in pressure compensation chamber now, and change runner flow section size plays the effect of adjust flux.Wherein between the distortion of flexible sheet and fluid motion, exist stronger Dynamics Coupling relation, use traditional CFD analytical approach to be difficult to obtain pressure compensation douche inner fluid dynamic flow characteristic.
Traditional pressure compensation douche design, the main CFD of employing calculates the method with experiment combination, the deflection of flexible sheet, the relation of pressure versus flow are not easy to arrive exactly, model pre-estimating resultant error is larger, model parameter mainly relies on experiment, by repeatedly testing finally product approval, designs and develops blindness large, construction cycle is long, and development cost is high.
Summary of the invention
Object of the present invention is mainly to overcome in traditional pressure compensation douche design, model parameter mainly relies on experiment repeatedly to determine, construction cycle is long, and the shortcoming that development cost is high has proposed a kind of pressure compensation douche method for designing of calculating based on the solid Coupled Numerical of stream.
For achieving the above object, the technical solution used in the present invention is:
1), first according to douche designing requirement, adopt CAD software pro/e to set up fluid mass Parametric geometric model and flexible sheet geometric model in douche;
2) then cad model is imported in CAE software ADINA, set the boundary condition identical with actual condition and solve and control after parameter, flow solid Coupled Numerical and calculate;
3) adjust geometric model parameter according to result of calculation, until result of calculation and designing requirement deviation are in design accuracy requires allowed band, produce rapid shaping testpieces, carry out hydraulic performance experiment;
4) contrast hydraulic performance experimental result and designing requirement, if experimental result and designing requirement deviation are in design accuracy requires allowed band, complete design, if do not meet and revise model.
Its concrete steps are as follows:
The first step, geometric model is set up
Tentatively determine pressure compensation douche structural parameters according to douche designing requirement, use CAD software pro/e to set up respectively douche fluid domain geometric model and flexible sheet geometric model;
When modeling, in fluid domain geometric model, diaphragm face of cylinder external position, adds Thin Film Flows volume geometric model, and thickness is no more than diaphragm diameter 1%;
Second step, model imports
Fluid domain and flexible sheet geometric model are imported respectively to the corresponding fluid of CAE software for calculation ADINA and structural calculation module, and the material parameter of fluid, diaphragm is set respectively, fluid parameter is incompressible viscous fluid, density 1000kg/m
3, laminar flow kinetic viscosity 1E-3Ns/m
2, turbulence model is selected K-ω low reynolds number turbulence model.Diaphragm adopts 2 parameter Mooney-Rivlin elastomeric material models, determines model parameter C according to elastomeric material uniaxial tensile test
1, C
2and Poisson ratio μ.Contact wall model adopts the surface how much setting up in ADINA software, and is made as rigid contact surfaces;
The 3rd step, model is discrete
In ADINA software, carry out geometry discrete, grid division, fluid model adopts 4 node tetrahedral grid mesh discretizations.Solid model adopts 8 node hexahedral mesh mesh discretizations, and contact wall model adopts 4 node surface grids discrete;
The 4th step, boundary condition setting
Fluid domain adopts pressure entrance 1 and static pressure exit condition, top hole pressure value is atmospheric pressure, reference value 0kPa, fluid-flexible sheet interface is for flowing the border that is admittedly coupled, the transient state method for solving that adopts process of iteration to combine with method of addition, porch pressure progressively increment loads, simultaneously controlled pressure heap(ed) capacity, to avoid the excessive mesh overlay that causes of diaphragm deformation, ensure computational convergence.Flexible sheet and compensated cavity wall surface of contact are Contact Boundary, and friction factor is recorded by experiment, and flexible sheet-fluid interface is for flowing the border that is admittedly coupled;
The 5th step, the solid Coupled Numerical of stream calculates
The solid coupling of stream adopts iteration coupling analytical method, governing equation solves the complete Newton iteration method that adopts, displacement and pressure convergence criterion---relative residual error is less than 0.001, fluid governing equation solves employing Finite Volume Method, form is selected second order spatial spreading, time integral adopts second order composite Integration Scheme, solve and adopt simple algorithm, variable convergence criterion---residual error is less than 0.001 relatively, solid analysis adopts implicit expression method of dynamic analysis, Finite Element Method is discrete, second order accuracy Bathe composite time integral form, Newton iteration method is calculated completely, displacement convergence criterion---residual error is less than 0.001 relatively, diaphragm and the analysis of wall Contact adopt constraint function algorithm,
The 6th step, adaptive mesh reconstruct
Distortion occurs grid can affect computational convergence, and in the time that coupling calculating can not restrain in 100 steps, termination of computations, carries out grid reconstruction;
The 7th step, restart analysis
On new grid model using the result before termination of computations after starting condition is applied to reconstruct, return to the 5th step and continue the solid Coupled Numerical calculating of stream, until the inlet pressure value loading reaches required pressure;
The 8th step, aftertreatment
Rate of discharge corresponding to the different inlet pressures of statistics after calculating completes, draw pressure-flow relation curve, and contrast with designing requirement: if result of calculation and designing requirement deviation are in design accuracy requires allowed band, complete calculating, carry out the 9th step work; Otherwise return to the first step, amendment model parameter recalculates until meet design requirement, and record completed model parameter and the result of calculation of calculating, for amendment model parameter provides foundation;
The 9th step, Quick formed part is made
According to stream, determined pressure compensation douche structural parameters are calculated in solid coupling, make its rapid shaping experimental piece, and complete experimental piece assembling;
The tenth step, hydraulic performance experiment
By the experimental piece access douche combination property bench of making, test, experimental result and designing requirement are contrasted, according to comparing result, douche model parameter is modified, turning back to the first step restarts to calculate, until experimental result and designing requirement deviation are in the time that design accuracy requires in allowed band, complete pressure compensation douche fast shaping.
The present invention, first according to douche designing requirement, adopts CAD software pro/e to set up fluid mass Parametric geometric model and flexible sheet geometric model in douche.Then fluid and diaphragm cad model are imported respectively to corresponding fluid and structural calculation module in CAE software ADINA, conditions setting and solving is controlled after parameter, flows solid Coupled Numerical and calculates.In numerical procedure, carry out grid reconstruction to ensure the quality of computing grid in good time.Adjust geometric model parameter according to result of calculation, until result of calculation meets after design accuracy requirement, produce rapid shaping testpieces, carry out hydraulic performance experiment.Contrast and experiment and designing requirement, or amendment model, or complete design.
Brief description of the drawings
Fig. 1 is the technology of the present invention route map;
Fig. 2 is structure and the calculation of boundary conditions schematic diagram of pressure compensation douche example model of the present invention;
Fig. 3 is pressure compensation douche fluid domain geometric model figure of the present invention;
Fig. 4 is pressure compensation douche fluid domain grid model figure of the present invention;
Fig. 5 is device flexible sheet of the present invention and contact wall grid model figure;
Fig. 6 is grid chart after diaphragm deformation of the present invention;
Fig. 7 is the fluid deformation grid sections figure that compensated cavity of the present invention region is caused by diaphragm deformation;
Fig. 8 is that compensated cavity regional fluid grid of the present invention is heavily divided rear sectional view;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Referring to Fig. 1, process of the present invention is as follows:
1), first according to douche designing requirement, adopt CAD software pro/e to set up fluid mass Parametric geometric model and flexible sheet geometric model in douche;
2) then cad model is imported in CAE software ADINA, set the boundary condition identical with actual condition and solve and control after parameter, flow solid Coupled Numerical and calculate;
3) adjust geometric model parameter according to result of calculation, until result of calculation and designing requirement deviation are in design accuracy requires allowed band, produce rapid shaping testpieces, carry out hydraulic performance experiment;
4) contrast hydraulic performance experimental result and designing requirement, if experimental result and designing requirement deviation are in design accuracy requires allowed band, complete design, if do not meet and revise model.
Its detailed process is as follows:
The first step, geometric model is set up
Tentatively determine pressure compensation douche structural parameters according to douche designing requirement, use CAD software pro/e to set up respectively douche fluid domain geometric model and flexible sheet geometric model; Because flexible sheet distortion is larger on the impact of douche serviceability, distortion is caused by hydrodynamic pressure, for consistent with actual conditions, when the modeling of fluid domain geometric model, at diaphragm face of cylinder external position, add Thin Film Flows volume geometric model, thickness is no more than diaphragm diameter 1%; To avoid this segment fluid flow exert an influence excessive to whole flow field and do not conform to actual conditions.Douche shown in Fig. 2 is set up fluid model as shown in Figure 3.
Second step, model imports
Fluid domain and flexible sheet geometric model are imported respectively to corresponding fluid and structural calculation module in CAE software for calculation ADINA, and the material parameter of fluid, diaphragm is set respectively, fluid major parameter is incompressible viscous fluid, density 1000kg/m
3, laminar flow kinetic viscosity 1E-3Ns/m
2, turbulence model is selected K-ω low reynolds number turbulence model.Diaphragm adopts 2 parameter Mooney-Rivlin elastomeric material models, determines model parameter C according to elastomeric material uniaxial tensile test
1, C
2and Poisson ratio μ.Contact wall model adopts the surface how much setting up in ADINA software, and is made as rigid contact surfaces.
The 3rd step, model is discrete
In ADINA software, carry out geometry discrete, grid division.
Fluid model adopts 4 node tetrahedral grid mesh discretizations, and grid as shown in Figure 4.Diaphragm model adopts 8 node hexahedral mesh mesh discretizations, and contact wall model adopts 4 node surface grids, and diaphragm and contact wall grid are as shown in Figure 5;
The 4th step, boundary condition setting
Fluid analysis adopts position shown in 1 in pressure entrance 1(Fig. 2) and static pressure exit condition, top hole pressure value is atmospheric pressure, position shown in 4 in reference value 0kPa(Fig. 2), fluid-flexible sheet interface is for flowing the border (position shown in 2 in Fig. 2) that is admittedly coupled.The not intellectual of contact analysis in the non-linear and structure field of consideration elastomeric material analysis on Large Deformation, the transient state method for solving that adopts process of iteration to combine with method of addition, porch pressure progressively increment loads.Controlled pressure heap(ed) capacity simultaneously, to avoid the excessive mesh overlay that causes of diaphragm deformation, ensures computational convergence.Flexible sheet and compensated cavity wall surface of contact are Contact Boundary (position shown in 3 in Fig. 2), and friction factor is recorded by experiment, and flexible sheet-fluid interface is for flowing the border (position shown in 2 in Fig. 2) that is admittedly coupled.
The solid Coupled Numerical of the 5th step stream calculates
The solid coupling of stream adopts iteration coupling analytical method, and governing equation solves and adopts complete Newton iteration method, and displacement and pressure convergence criterion---relative residual error is less than 0.001.Fluid governing equation solves employing Finite Volume Method, and form is selected second order spatial spreading, and time integral adopts second order composite Integration Scheme, solves and adopts simple algorithm, variable convergence criterion---and residual error is less than 0.001 relatively.Solid analysis adopts implicit expression method of dynamic analysis, Finite Element Method is discrete, second order accuracy Bathe composite time integral form, Newton iteration method is calculated completely, displacement convergence criterion---residual error is less than 0.001 relatively, and diaphragm and the analysis of wall Contact adopt constraint function algorithm.
The 6th step, adaptive mesh reconstruct
Flexible sheet deforms (as Fig. 6) under fluid pressure action, thereby causes the change of fluid geometric configuration and cause fluid mesh distortion (as Fig. 7).Distortion occurs fluid grid can affect computational convergence, and in the time that mesh distortion causes coupling calculating not restrain in 100 steps, termination of computations, carries out fluid domain grid reconstruction, and after reconstruct, fluid grid as shown in Figure 8.
The 7th step, restart analysis
On new grid model using the result before termination of computations after starting condition is applied to reconstruct, return to the 5th step and continue the solid Coupled Numerical calculating of stream, until the inlet pressure value loading reaches required pressure.
The 8th step, aftertreatment
Rate of discharge corresponding to the different inlet pressures of statistics after calculating completes, draw pressure-flow relation curve, and contrast with designing requirement: if result of calculation and designing requirement deviation are in design accuracy requires allowed band, complete calculating, carry out the 9th step work; Otherwise return to the first step, amendment model parameter recalculates until meet design requirement, and record completed model parameter and the result of calculation of calculating, for amendment model parameter provides foundation.
The 9th step, Quick formed part is made
According to stream, determined pressure compensation douche structural parameters are calculated in solid coupling, make its rapid shaping experimental piece, and complete experimental piece assembling.
The tenth step, hydraulic performance experiment
By the experimental piece access douche combination property bench of making, test.Experimental result and designing requirement are contrasted, according to comparing result, douche model parameter is modified, turn back to the first step and restart to calculate, until experimental result and designing requirement deviation are in design accuracy requires allowed band, complete pressure compensation douche fast shaping.
Claims (1)
1. a pressure compensation douche method for designing of calculating based on the solid Coupled Numerical of stream, is characterized in that comprising the following steps:
The first step, geometric model is set up
Tentatively determine pressure compensation douche structural parameters according to douche designing requirement, use CAD software pro/e to set up respectively douche fluid domain geometric model and flexible sheet geometric model;
When modeling, in fluid domain geometric model, diaphragm face of cylinder external position, adds Thin Film Flows volume geometric model, and thickness is no more than diaphragm diameter 1%;
Second step, model imports
Fluid domain and flexible sheet geometric model are imported respectively to the corresponding fluid of CAE software for calculation ADINA and structural calculation module, and the material parameter of fluid, diaphragm is set respectively, fluid parameter is incompressible viscous fluid, density 1000kg/m
3, laminar flow kinetic viscosity 1E-3Ns/m
2, turbulence model is selected K-ω low reynolds number turbulence model; Diaphragm adopts 2 parameter Mooney-Rivlin elastomeric material models, determines model parameter C according to elastomeric material uniaxial tensile test
1, C
2and Poisson ratio μ; Contact wall model adopts the surface how much setting up in ADINA software, and is made as rigid contact surfaces;
The 3rd step, model is discrete
In ADINA software, carry out geometry discrete, grid division, fluid model adopts 4 node tetrahedral grid mesh discretizations; Flexible sheet geometric model adopts 8 node hexahedral mesh mesh discretizations, and contact wall model adopts 4 node surface grids discrete;
The 4th step, boundary condition setting
Fluid domain adopts pressure entrance (1) and static pressure exit condition, top hole pressure value is atmospheric pressure, reference value 0kPa, fluid-flexible sheet interface is for flowing the border that is admittedly coupled, the transient state method for solving that adopts process of iteration to combine with method of addition, porch pressure progressively increment loads, simultaneously controlled pressure heap(ed) capacity, to avoid the excessive mesh overlay that causes of diaphragm deformation, ensure computational convergence; Flexible sheet and compensated cavity wall surface of contact are Contact Boundary, and friction factor is recorded by experiment, and flexible sheet-fluid interface is for flowing the border that is admittedly coupled;
The 5th step, the solid Coupled Numerical of stream calculates
The solid coupling of stream adopts iteration coupling analytical method, governing equation solves the complete Newton iteration method that adopts, displacement and pressure convergence criterion---relative residual error is less than 0.001, fluid governing equation solves employing Finite Volume Method, form is selected second order spatial spreading, time integral adopts second order composite Integration Scheme, solve and adopt simple algorithm, variable convergence criterion---residual error is less than 0.001 relatively, solid analysis adopts implicit expression method of dynamic analysis, Finite Element Method is discrete, second order accuracy Bathe composite time integral form, Newton iteration method is calculated completely, displacement convergence criterion---residual error is less than 0.001 relatively, diaphragm and the analysis of wall Contact adopt constraint function algorithm,
The 6th step, adaptive mesh reconstruct
Distortion occurs grid can affect computational convergence, and in the time that coupling calculating can not restrain in 100 steps, termination of computations, carries out grid reconstruction;
The 7th step, restart analysis
On new grid model using the result before termination of computations after starting condition is applied to reconstruct, return to the 5th step and continue the solid Coupled Numerical calculating of stream, until the inlet pressure value loading reaches required pressure;
The 8th step, aftertreatment
Rate of discharge corresponding to the different inlet pressures of statistics after calculating completes, draw pressure-flow relation curve, and contrast with designing requirement: if result of calculation and designing requirement deviation are in design accuracy requires allowed band, complete calculating, carry out the 9th step work; Otherwise return to the first step, amendment model parameter recalculates until meet design requirement, and record completed model parameter and the result of calculation of calculating, for amendment model parameter provides foundation;
The 9th step, Quick formed part is made
According to stream, determined pressure compensation douche structural parameters are calculated in solid coupling, make its rapid shaping experimental piece, and complete experimental piece assembling;
The tenth step, hydraulic performance experiment
By the experimental piece access douche combination property bench of making, test, experimental result and designing requirement are contrasted, according to comparing result, douche model parameter is modified, turning back to the first step restarts to calculate, until experimental result and designing requirement deviation are in the time that design accuracy requires in allowed band, complete pressure compensation douche fast shaping.
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| CN106396078A (en) * | 2016-06-24 | 2017-02-15 | 中国科学院重庆绿色智能技术研究院 | A constructing method of a biological process system concentration field |
| CN108109206B (en) * | 2017-12-18 | 2021-05-25 | 中航锂电技术研究院有限公司 | Finite element modeling method for opening pressure of lithium battery safety valve |
| CN109241690B (en) * | 2018-11-12 | 2023-01-03 | 扬州大学 | CFD-based sluice over-current flow calculation method |
| CN110020487B (en) * | 2019-04-12 | 2023-06-20 | 上汽大众汽车有限公司 | Deflection deformation compensation method for blank holder of drawing die |
| CN111912590B (en) * | 2020-06-17 | 2022-05-10 | 成都飞机工业（集团）有限责任公司 | Method for judging structural rigidity of part based on static load deformation |
| CN112287622B (en) * | 2020-12-28 | 2021-03-09 | 中国人民解放军国防科技大学 | Quick turbulence numerical simulation method and device based on link direction manual compression |
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