Problem with boundary condictions in an airfoil

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 September 22, 2010, 05:56 Problem with boundary condictions in an airfoil #1 New Member   Begoņa Join Date: Oct 2009 Posts: 28 Rep Power: 9 Sponsored Links Hello all, I'm new using OpenFoam, and I'm doing a project with it. I'm trying to calculate p and U for an airfoil using pisoFoam, with kepsilon realizable.I have free flow arround the profile. I have the mesh ok, and I have some files in 0 directory, this files are p, U, epsilon, k and nut. For p I have a fixedValue at the outlet and the other patch are type zeroGradient uniform 0. For U I have a fixedValue in the inlet and type zeroGradient;value uniform (0 0 0) for the other patches, internalField is uniform (0 0 0) too. For epsilon I'm not sure, becouse I tryied with zeroGradient and an uniformValue (the value calculated for epsilon) in the boundary patches and in the fixedWalls type epsilonWallFunction; value uniform 58; For k i put kqRWallFunction with intensity 0.05 and value uniform 0.8, and as epsilon I tryied diferents values, now I have zeroGradient inlet, outlet, up and down with value uniform 0. For nut I have nutWallFunction with value uniform 0.00098 for fixedWalls, and zeroGradient with value uniform 0 for the other patch. I have the following error when I run pisoFoam in the terminal: Courant Number mean: 395.235 max: 3522.91 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 2.2568e-06, No Iterations 60 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 3.28351e-06, No Iterations 59 DICPCG: Solving for p, Initial residual = 0.525457, Final residual = 0.0255011, No Iterations 91 time step continuity errors : sum local = 4.35501e+16, global = 5.60967e+14, cumulative = 5.60967e+14 DICPCG: Solving for p, Initial residual = 0.604277, Final residual = 2.91837e-07, No Iterations 106 time step continuity errors : sum local = 4.12262e+14, global = 1.28006e+12, cumulative = 5.62247e+14 DILUPBiCG: Solving for epsilon, Initial residual = 0.99879, Final residual = 149318, No Iterations 1001 bounding epsilon, min: -8.04946e+31 max: 2.25381e+32 average: 4.01452e+29 #0 Foam::error:rintStack(Foam::Ostream&) in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: #3 Foam::divide(Foam::Field&, Foam::UList const&, Foam::UList const&) in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libOpenFOAM.so" #4 void Foam::divide(Foam::GeometricField&, Foam::GeometricField const&, Foam::GeometricField const&) in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libincompressibleRASModels.so" #5 Foam::tmp > Foam:perator/(Foam::GeometricField const&, Foam::GeometricField const&) in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libincompressibleRASModels.so" #6 Foam::incompressible::RASModels::realizableKE::cor rect() in "/home/bego/OpenFOAM/OpenFOAM-1.6/lib/linuxGccDPOpt/libincompressibleRASModels.so" #7 main in "/home/bego/OpenFOAM/OpenFOAM-1.6/applications/bin/linuxGccDPOpt/pisoFoam" #8 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6" #9 _start at /usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/i386/elf/start.S:122 Thanks Bego Last edited by bego; September 22, 2010 at 06:51.

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