Conjugate Heat Transfer in OpenFOAM: Solver Comparison & Optimization

Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Study of conjugate heat transfer in OpenFOAM Turo Välikangas Mechanical Engineering and Industrial Systems, Tampere University of Technology, Tampere, Finland 2016-12-05 Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 1 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Outline Get the files and unpack Download the file named oneFluidOneSolid2D.tgz Unpack the files and enter the case directory: tar xzf oneFluidOneSolid2D.tgz rm oneFluidOneSolid2D.tgz cd oneFluidOneSolid2D Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 2 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Outline Conjugated heat transfer in OpenFOAM foundation and extended In this presentation we look through the interesting bits of the case setups for chtMultiRegionSimpleFoam in OpenFOAM foundation 4.0, chtMultiRegionSimpleFoam in FOAM extend 4.0 and conjugateHeatSimpleFoam in FOAM extend 4.0. We look what boundary conditions needs to be specified in the patches that connect the regions together, where thermal properties needs to be defined for every solver and go through some solver specific tips for solving cases. Then we modify the chtMultiRegionSimpleFoam in OpenFOAM foundation 4.0 to make it converge faster. Compare the convergence speed of all the solvers For extra content a uniformExternalWallHeatFlux boundary condition is introduced Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 3 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Outline Illustration of the tutorial case Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 4 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe Run the case with chtMultiRegionSimpleFoam in OpenFOAM foundation 4.0 cd oneFluidOneWall2DOF401Loop/ ./Allrun >& log & tree Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 5 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe tree structure for 0/ 0 cellToRegion fluid p p_rgh T U p p_rgh solid p T T U Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 6 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe 0/fluid/T/ boundaryField { fluid_top { type value } leftLet { type value } rightLet { type value } frontAndBack { type } fluid_to_solid { type value Tnbr kappaMethod kappaName } } Turo Välikangas symmetryPlane; uniform 300; fixedValue; uniform 300; zeroGradient; uniform 300; empty; compressible::turbulentTemperatureCoupledBaffleMixed; uniform 300; T; fluidThermo; none; fasterChtMultiRegionSimpleFoam 2016-12-05 7 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe 0/solid/T/ boundaryField { solid_bottom { type value } leftLet { type value } rightLet { type value } frontAndBack { type } solid_to_fluid { type value kappaMethod kappaName Tnbr } } Turo Välikangas symmetryPlane; uniform 350; zeroGradient; uniform 350; zeroGradient; uniform 350; empty; compressible::turbulentTemperatureCoupledBaffleMixed; uniform 350; solidThermo; none; T; fasterChtMultiRegionSimpleFoam 2016-12-05 8 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe tree structure for constant/ constant fluid fvOptions g polyMesh boundary faces neighbour owner points radiationProperties RASProperties thermophysicalProperties turbulenceProperties regionProperties Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 9 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe limitTemperature fvOptions limitT { type limitTemperature; region fluid; active yes; limitTemperatureCoeffs { selectionMode all; Tmin 200; Tmax 400; } } Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 10 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe constant/fluid/polyMesh/boundary fluid_to_solid { type nFaces startFace inGroups sampleMode sampleRegion samplePatch } Turo Välikangas mappedWall; 100; 19900; 1 ( wall ); nearestPatchFace(AMI); solid; solid_to_fluid; fasterChtMultiRegionSimpleFoam 2016-12-05 11 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe tree structure for constant/ solid fvOptions polyMesh boundary faces neighbour owner points thermophysicalProperties Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 12 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe constant/solid/polyMesh/boundary solid_to_fluid { type nFaces startFace inGroups sampleMode sampleRegion samplePatch } Turo Välikangas mappedWall; 100; 19800; 1 ( solid ); nearestPatchFace(AMI); fluid; fluid_to_solid; fasterChtMultiRegionSimpleFoam 2016-12-05 13 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe tree structure for system/ system controlDict customRegexp decomposeParDict fluid blockMeshDict changeDictionaryDict fvOptions fvSchemes fvSolution fvSchemes fvSolution Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 14 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe tree structure for system/ solid blockMeshDict changeDictionaryDict decomposeParDict fvOptions fvSchemes fvSolution Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 15 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory,run and observe fieldMinMax for comparing results fieldMinMaxFluid { type fieldMinMax; functionObjectLibs ("libfieldFunctionObjects.so"); region fluid; write yes; log yes; location no; mode magnitude; fields ( T ); } Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 16 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe Run the case with chtMultiRegionSimpleFoam in FOAM Extend 4.0 cd.. cd oneFluidOneSolid2DFE40/ ./Allrun >& log & tree Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 17 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for 0/ . 0 cellToRegion fluid p T U p solid cp Kappa rho T T U Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 18 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for constant/ constant fluid fvOptions g radiationProperties RASProperties thermophysicalProperties turbulenceProperties regionProperties solid fvOptions Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 19 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for system/ fluid.setSet faceSet fluid_to_solidZone new patchToFace fluid_to_solid solid.setSet faceSet solid_to_fluidZone new patchToFace solid_to_fluid Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 20 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for constant/ system controlDict customRegexp decomposeParDict fluid blockMeshDict changeDictionaryDict decomposeParDict fvSchemes fvSolution fvSchemes fvSolution solid blockMeshDict changeDictionaryDict decomposeParDict fvSchemes fvSolution Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 21 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe constant/fluid/polyMesh/boundary fluid_to_solid { type nFaces startFace sampleMode sampleRegion samplePatch offset } Turo Välikangas directMappedWall; 100; 19900; nearestPatchFace; solid; solid_to_fluid; ( 0 0 0 ); fasterChtMultiRegionSimpleFoam 2016-12-05 22 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe constant/solid/polyMesh/boundary solid_to_fluid { type nFaces startFace sampleMode sampleRegion samplePatch offset } Turo Välikangas directMappedWall; 100; 19800; nearestPatchFace; fluid; fluid_to_solid; ( 0 0 0 ); fasterChtMultiRegionSimpleFoam 2016-12-05 23 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for system/ system controlDict decomposeParDict fluid blockMeshDict changeDictionaryDict decomposeParDict fvSchemes fvSolution fvSchemes fvSolution solid blockMeshDict changeDictionaryDict decomposeParDict fvSchemes fvSolution Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 24 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe Run the case with conjugateHeatSimpleFoam in FOAM Extend 4.0 cd.. cd oneFluidOneWall2DFE40Coupled/ ./Allrun >& log & tree Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 25 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for 0/ . 0 kappaEff p p_rgh solid k T T U Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 26 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for constant/ constant g polyMesh boundary boundaryRegionAddressing faces faceZones neighbour owner points sets fluid_to_solidZone radiationProperties RASProperties transportProperties turbulenceProperties Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 27 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe Coupling boundary condition for fluid fluid_to_solid { type nFaces startFace shadowRegion shadowPatch zone attached master isWall bridgeOverlap } Turo Välikangas regionCouple; 100; 19900; solid; solid_to_fluid; fluid_to_solidZone; off; on; on; false; fasterChtMultiRegionSimpleFoam 2016-12-05 28 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for constant/ solid fvOptions polyMesh boundary faces faceZones neighbour owner points sets solid_to_fluidZone thermalProperties Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 29 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe Coupling boundary condition solid_to_fluid { type nFaces startFace shadowRegion shadowPatch zone attached master isWall bridgeOverlap } Turo Välikangas regionCouple; 100; 19800; region0; fluid_to_solid; solid_to_fluidZone; off; off; on; false; fasterChtMultiRegionSimpleFoam 2016-12-05 30 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe decomposeBug with conjugateHeatFoam If you have to use bridgeOverlap true; When you decompose, Foam-extend changes all true:s to false. Then use: find -name "boundary" -exec sed -i ’s/false/true/g’ {} + Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 31 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion Go to the case directory, run and observe tree structure for system/ system blockMeshDict changeDictionaryDict controlDict decomposeParDict fvSchemes fvSolution solid blockMeshDict changeDictionaryDict decomposeParDict fvSchemes fvSolution Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 32 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion How to create the files and edit the solver loop chtCustomMultiRegionSimpleFoam Create the basic files in your user directory and edit them: (These can be found in the copyPaste file) cd $WM_PROJECT_USER_DIR mkdir -p applications/solvers/heatTransfer/ cd applications/solvers/heatTransfer/ cp -rf $FOAM_SOLVERS/heatTransfer/chtMultiRegionFoam/ ./ mv chtMultiRegionFoam/ chtCustomMultiRegionFoam cd chtCustomMultiRegionFoam mv chtMultiRegionSimpleFoam/ chtCustomMultiRegionSimpleFoam cd chtCustomMultiRegionSimpleFoam mv chtMultiRegionSimpleFoam.C chtCustomMultiRegionSimpleFoam.C sed -i s/chtMultiRegionSimpleFoam/chtCustomMultiRegionSimpleFoam/g chtCustomMultiRegionSimpleFoam.C sed -i s/chtMultiRegionSimpleFoam/chtCustomMultiRegionSimpleFoam/g Make/files sed -i s/FOAM_APPBIN/FOAM_USER_APPBIN/g Make/files Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 33 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion How to create the files and edit the solver loop chtCustomMultiRegionSimpleFoam Edit the solver loop: sed -i ’57i int numberOfFluidLoops =runTime.controlDict().lookupOrDefault<int>("numberOfFluidLoops", 1); \n’ ch sed -i ’58i int numberOfSolidLoops =runTime.controlDict().lookupOrDefault<int>("numberOfSolidLoops", 1);\n’ cht sed -i ’59i Info<< "The number of Fluid region loops per iteration step "<< numberOfFluidLoops<< endl;\n’ chtCu sed -i ’60i Info<< "The number of Solid region loops per iteration step "<< numberOfSolidLoops << endl;\n’ chtC sed -i ’69i for(int iFluid =1 ; iFluid <= numberOfFluidLoops; iFluid++){’ chtCustomMultiRegionSimpleFoam.C sed -i ’79i }\nfor(int iSolid =1 ; iSolid <= numberOfSolidLoops; iSolid++){ ’ chtCustomMultiRegionSimpleFoam.C sed -i ’90i }’ chtCustomMultiRegionSimpleFoam.C Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 34 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion How to create the files and edit the solver loop chtCustomMultiRegionSimpleFoam wmake . /home/turo/OpenFOAM/OpenFOAM-4.x/etc/bashrc run cd oneFluidOneWall2D/oneFluidOneWall2DOF402Loop/ vim system/controlDict ./Allrun >& log& cd .. cd oneFluidOneWall2DOF405Loops/ ./Allrun >& log& cd .. Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 35 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion How to create the files and edit the solver loop Plot results with spyder In the Allrun a sed command collects the execution times in to a file: sed -n -e ’/ExecutionTime/p’ log.conjugateHeatSimpleFoam > ExecutionTime Then the minimum temperature in the solid is plotted against the ExecutionTime to see which solver converges fastest. Lets also compare the temperature fields. Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 36 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion What have we learned, future work and extra content Figure: Extra content Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 37 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion What have we learned, future work and extra content What modifications were done Add to the private side on the .H file //- Time varying ambient temperature autoPtr<Function1<scalar> > uniformAmbientTemperature_; Then in the code where the heat transfer coefficient is calculated add: const scalar t = this->db().time().timeOutputValue(); Ta_ = uniformAmbientTemperature_->value(t); Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 38 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion What have we learned, future work and extra content An example of uniformExternalWallHeatFluxTemperature wallWarm { type uniformExternalWallHeatFluxTemperature; h uniform 25; //heat transfer coeff. kappaMethod solidThermo; kappaName default; value uniform 293.15; // initial temp. Ta uniform 500; // ambient temperature /[K] h uniform 25.0; // heat transfer coeff /[W/K/m2] thicknessLayers (0); // thickness of layer [m] kappaLayers (0); // thermal conductivity of // layer [W/m/K] value uniform 500; // initial temperature / [K] kappaName none; uniformAmbientTemperature table ((0 293.15) (20 487.82) (40 622.36) (60 717.65)); } Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 39 / 40 Introduction cht in OF40 cht in FE40 conjugateHeatSimpleFoam in FE40 chtCustom Conclusion What have we learned, future work and extra content An example of uniformExternalWallHeatFluxTemperature All the conjugated heat transfer solvers need a special case setup With a small modification the chtMultiRegionSimpleFoam can be a bit faster conjugateHeatSimpleFoam is superior compared to others uniformExternalWallHeatFlux was created I will use only coupled solvers in the future for conjugated heat transfer problems! Turo Välikangas fasterChtMultiRegionSimpleFoam 2016-12-05 40 / 40

Conjugate Heat Transfer in OpenFOAM: Solver Comparison & Optimization

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