[yassepid]

I want to Run supersonic flow of air over a cylinder at Knudsen number Kn=.01
And therefore, I must to use Maxwell’s velocity slip and Smoluwski temperature
jump conditions at the wall boundary.

I see these condition in openFoam classes as :

Foam::maxwellSlipUFvPatchVectorField
Foam::smoluchowskiJumpTFvPatchScalarField

i use these boundary as follow:

type maxwellSlipU;
accommodationCoeff .5;
Uwall uniform (0 0 0);
thermalCreep on;
curvature on;
value uniform (0 0 0);
refValue uniform (0 0 0);
valueFraction .5

but i encounter this error

#0 Foam::error:rintStack(Foam::Ostream&) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#2 in "/lib/libc.so.6"
#3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#4 Foam:perator/(Foam::UList<double> const&, Foam::UList<double> const&) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so"
#5 Foam::smoluchowskiJumpTFvPatchScalarField::updateC oeffs() in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/librhoCentralFoam.so"
#6 Foam::mixedFvPatchField<double>::evaluate(Foam::Ps tream::commsTypes) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libfiniteVolume.so"
#7 Foam::mixedInternalEnergyFvPatchScalarField::updat eCoeffs() in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libbasicThermophysicalModels.so"
#8 Foam::mixedFvPatchField<double>::evaluate(Foam::Ps tream::commsTypes) in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libfiniteVolume.so"
#9 Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::GeometricBoundaryField::evaluate() in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/rhoCentralFoam"
#10
in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/rhoCentralFoam"
#11 __libc_start_main in "/lib/libc.so.6"
#12
in "/home/aminiyasser/OpenFOAM/OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/rhoCentralFoam"
Floating point exception



for solve this error what i must do ?

[e.ahmadiyan]

I have same problem as you nowadays Could you help me to implement this boundary conditions ? Thanks a lot in advance. Best regards.

[Quasar_89]

Originally Posted by yassepid

I want to Run supersonic flow of air over a cylinder at Knudsen number Kn=.01
And therefore, I must to use Maxwell’s velocity slip and Smoluwski temperature
jump conditions at the wall boundary.

I am sure, i have read enough papers on the Kn number to comfortably say that your assumption about slip velocity at Kn < 0.01 is not correct. This is true for an order higher which is Kn approx equal to 0.1.