Drag is too much high
Hello ,
I am analysing 2D NACA0012 airfoil . My solver is pimpleFoam . Reynold number is 1500000 and yplus value is 1 ( probably this can be wrong). Turbulence model is k-omega SST but also tried other models (spalartallmaras and k-epsilon) .My mesh type is hybrid triangle mesh I also tried c-mesh. Unfortunateley , I always get high drag coefficient value in every different attemp at 0 degree angle of attack. Experimental result is 0.01 but I always get the value of 0.1. When I increase my yplus value , I get faster solution but there is no change in drag coefficient as always. What are your advices ? I am amateur in openfoam , maybe there is a huge fault but I didnt find yet. these are my system files ; FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default CrankNicolson 0.5; } gradSchemes { default Gauss linear; grad(U) cellLimited Gauss linear 1; } divSchemes { default none; div(phi,U) Gauss limitedLinearV 1; div(phi,k) Gauss limitedLinear 1; div(phi,omega) Gauss limitedLinear 1; div((nuEff*dev2(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear corrected 0.5; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; } ------------------------------------ solvers { "pcorr.*" { solver GAMG; tolerance 0.02; relTol 0; smoother GaussSeidel; } p { $pcorr; tolerance 1e-7; relTol 0.01; } pFinal { $p; tolerance 1e-7; relTol 0; } "(U|k|omega)" { solver smoothSolver; smoother symGaussSeidel; tolerance 1e-06; relTol 0.1; } "(U|k|omega)Final" { $U; tolerance 1e-06; relTol 0; } cellDisplacement { solver GAMG; tolerance 1e-5; relTol 0; smoother GaussSeidel; } } PIMPLE { nCorrectors 2; nNonOrthogonalCorrectors 1; nOuterCorrectors 1; pMinFactor 0.1; pMaxFactor 2; pRefCell 0; pRefValue 0; } relaxationFactors { fields { p 0.3; } equations { "(U|k|omega)" 0.7; "(U|k|omega)Final" 1.0; } } cache { grad(U); } ---------------------------------------------- application pimpleDyMFoam; startFrom latestTime; startTime 0; stopAt endTime; endTime 0.15; deltaT 2e-5; writeControl adjustableRunTime; writeInterval 0.001; purgeWrite 0; writeFormat ascii; writePrecision 8; writeCompression off; timeFormat general; timePrecision 6; runTimeModifiable true; maxCo 0.9; functions { sixDoFRigidBodyState { type sixDoFRigidBodyState; libs ("libsixDoFRigidBodyState.so"); angleFormat degrees; } } functions { forces { type forces; functionObjectLibs ("libforces.so"); patches (airfoil); rho rhoInf; rhoInf 1000; CofR ( 0 0 0 ); magUInf 1.5; } forceCoeffs { type forceCoeffs; functionObjectLibs ("libforces.so"); patches (airfoil); rho rhoInf; rhoInf 1000; liftDir (0 1 0); dragDir (1 0 0); pitchAxis (0 0 1); magUInf 1.5; lRef 1; Aref 1; CofR ( 0 0 0 ); } } |
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