Hello everybody,
I have been trying for quite some time to run a compressible simulation of a NACA 0012 profile, using rhoSimplecFoam and kOmegaSST for turbulence modeling.
My mesh is unstructured, checkMesh indicates no problems.
Running a simulation at Mach 0.7 generates following output:
Starting time loop
Time = 0.1
GAMG: Solving for Ux, Initial residual = 1, Final residual = 0.0615838, No Iterations 1
GAMG: Solving for Uy, Initial residual = 1, Final residual = 0.0598451, No Iterations 1
GAMG: Solving for p, Initial residual = 1, Final residual = 27.4647, No Iterations 1000
time step continuity errors : sum local = 0.793546, global = 0.47889, cumulative = 0.47889
rho max/min : 0.1 0.1
GAMG: Solving for h, Initial residual = 0.627704, Final residual = 0.906171, No Iterations 1000
GAMG: Solving for omega, Initial residual = 0.00118687, Final residual = 5.36443e-06, No Iterations 1
smoothSolver: Solving for k, Initial residual = 1, Final residual = 0.0494026, No Iterations 2
ExecutionTime = 7.73 s ClockTime = 7 s
Time = 0.2
GAMG: Solving for Ux, Initial residual = 0.335287, Final residual = 0.00814846, No Iterations 2
GAMG: Solving for Uy, Initial residual = 0.0892067, Final residual = 0.00223789, No Iterations 2
#0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/libc.so.6"
(...
...)
in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/rhoSimplecFoam"
#10 __libc_start_main in "/lib/libc.so.6"
#11
in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/rhoSimplecFoam"
Floating point exception
I presume there's something off when calculating for p and h. I have no clue what the problem is though, an incompressible simulation, using simpleFoam and Spallart-Allmaras works fine.
Switching transonic off in fvSolution seems to stabilize the simulate at least so much to allow a minimal amount of postprocessing; every single variable diverges massively. Changing the relaxation factors has no significant effect.
I am quite new to OpenFoam, and have generated my files according to various threats in this forum as well as to the tutorial cases.
Here are my files fvSolution, fvSchemes, p and U.
Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
p0
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
p1
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
p
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
omega0
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
omega1
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 1;
tolerance 1e-10;
relTol 0.1;
}
omega
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
U0
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
U1
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 1;
tolerance 1e-10;
relTol 0.1;
}
U
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
h0
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
h1
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 1;
tolerance 1e-10;
relTol 0.1;
}
h
{
solver GAMG;
tolerance 1e-10;
relTol 0.1;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
k0
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
k1
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
k
{
solver smoothSolver;
smoother GaussSeidel;
tolerance 1e-10;
relTol 0.1;
nSweeps 1;
}
}
SIMPLE
{
nNonOrthogonalCorrectors 0;
rhoMin rhoMin [1 -3 0 0 0] 0.1;
rhoMax rhoMax [1 -3 0 0 0] 1.0;
transonic yes;
pRefPoint (100 0 0);
pRefValue 11000;
}
relaxationFactors
{
p 0.5;
U 0.7;
k 0.5;
omega 0.5;
rho 1;
h 0.95;
}
relaxationFactors0
{
p 0.3;
rho 0.4;
U 0.7;
h 0.7;
k 0.7;
omega 0.7;
}
// ************************************************************************* //
Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
default steadyState;
}
gradSchemes
{
default fourth;
grad(p) fourth;
grad(U) Gauss linear;
grad(omega) Gauss linear;
}
divSchemes
{
default none;
div(phi,U) Gauss upwind; //limitedLinearV 1; //upwind;
div((muEff*dev2(T(grad(U))))) Gauss linear;
div(phi,h) Gauss upwind; //limitedLinear 1; //upwind;
div(phi,k) Gauss upwind;
div(phi,omega) Gauss upwind;
div(phid,p) Gauss upwind;
div(U,p) Gauss linear;
}
laplacianSchemes
{
default Gauss linear limited 0.5;
}
interpolationSchemes
{
default none;
interpolate(rho) linear;
div(U,p) upwind phi;
interpolate((psi*U)) linear;
interpolate(U) linear;
UD upwind phid;
interpolate(p) linear;
interpolate(((rho|(A(U)-H(1)))-(rho|A(U)))) linear;
interpolate((rho*U)) linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default no;
p;
pCorr;
}
// ************************************************************************* //
Code:
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 11000;
boundaryField
{
NONE1 //Nearfield1
{
type empty;
}
NONE2 //Nearfield2
{
type empty;
}
NONE3 //Pressure Side
{
type zeroGradient;
}
NONE4 //Nearfield3
{
type empty;
}
NONE5 //Nearfield4
{
type empty;
}
NONE6 //Suction Side
{
type zeroGradient;
}
NONE7 //Wake resolution1
{
type empty;
}
NONE8 //Wake resolution2
{
type empty;
}
NONE9 //Trailing Edge
{
type zeroGradient;
}
NONE10 //Farfield1
{
type empty;
}
NONE11 //Farfield2
{
type empty;
}
NONE12 //Outer rim, lower half
{
type freestreamPressure;
//type fixedValue;
value uniform 11000;
}
NONE13 //Outer rim, upper half
{
type freestreamPressure;
//type fixedValue;
value uniform 11000;
}
}
// ************************************************************************* //
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (239.266 20.933 0);
boundaryField
{
NONE1 //Nearfield1
{
type empty;
}
NONE2 //Nearfield2
{
type empty;
}
NONE3 //Pressure Side
{
type fixedValue;
value uniform (0 0 0);
}
NONE4 //Nearfield3
{
type empty;
}
NONE5 //Nearfield4
{
type empty;
}
NONE6 //Suction Side
{
type fixedValue;
value uniform (0 0 0);
}
NONE7 //Wake resolution1
{
type empty;
}
NONE8 //Wake resolution2
{
type empty;
}
NONE9 //Trailing Edge
{
type fixedValue;
value uniform (0 0 0);
}
NONE10 //Farfield1
{
type empty;
}
NONE11 //Farfield2
{
type empty;
}
NONE12 //Outer rim, lower half
{
type freestream;
freestreamValue uniform (239.266 20.933 0);
}
NONE13 //Outer rim, upper half
{
type freestream;
freestreamValue uniform (239.266 20.933 0);
}
}
Thanks in advance for your help.
