| Clau.77 |
May 8, 2021 13:39 |
Floating Point Exception Error for p_rgh in chtMRF
Hey guys!
i have a multi region case in OF8 and i am having trouble with my fluid.
To keep it simple i am using steadyState and laminar flow.
The solver log looks like this:
Code:
/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 8
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
Build : 8
Exec : chtMultiRegionFoam
Date : May 08 2021
Time : 19:20:03
Host : "login02.css.lan"
PID : 51958
I/O : uncollated
Case : /bigwork/nhkfclan/Test_Merci
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create fluid mesh for region Luft for time = 0
Create solid mesh for region Form for time = 0
Create solid mesh for region Schokolade for time = 0
*** Reading fluid mesh thermophysical properties for region Luft
Adding to thermoFluid
Selecting thermodynamics package
{
type heRhoThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState perfectGas;
specie specie;
energy sensibleEnthalpy;
}
Adding to rhoFluid
Adding to UFluid
Adding to phiFluid
Adding to gFluid
Adding to hRefFluid
Adding to pRefFluid
Adding to ghFluid
Adding to ghfFluid
Adding to turbulenceFluid
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
Adding to thermophysicalTransport
Selecting thermophysical transport type laminar
Selecting default laminar thermophysical transport model Fourier
Adding to reactionFluid
Combustion model not active: combustionProperties not found
Selecting combustion model none
Adding to radiationFluid
Radiation model not active: radiationProperties not found
Selecting radiationModel none
Adding to KFluid
Adding to dpdtFluid
Adding to fieldsFluid
Adding MRF
No MRF models present
Adding fvOptions
*** Reading solid mesh thermophysical properties for region Form
Adding to thermos
Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIso;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}
Adding to radiations
Radiation model not active: radiationProperties not found
Selecting radiationModel none
Adding fvOptions
*** Reading solid mesh thermophysical properties for region Schokolade
Adding to thermos
Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIso;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}
Adding to radiations
Radiation model not active: radiationProperties not found
Selecting radiationModel none
Adding fvOptions
PIMPLE: Region Luft
PIMPLE: No convergence criteria found
PIMPLE: Region Form
PIMPLE: No convergence criteria found
PIMPLE: Region Schokolade
PIMPLE: No convergence criteria found
PIMPLE: Operating solver in steady-state mode with 1 outer corrector
PIMPLE: Operating solver in SIMPLE mode
Region: Luft Courant Number mean: 314.33656 max: 7014.9304
Region: Form Diffusion Number mean: 0.10103954 max: 261.63834
Region: Schokolade Diffusion Number mean: 101.25719 max: 251280.78
deltaT = 3.979466e-05
Region: Luft Courant Number mean: 0.012508916 max: 0.27915677
Region: Form Diffusion Number mean: 4.0208341e-06 max: 0.010411809
Region: Schokolade Diffusion Number mean: 0.0040294954 max: 9.9996333
deltaT = 3.979466e-05
Time = 3.97947e-05
Solving for fluid region Luft
DILUPBiCGStab: Solving for Ux, Initial residual = 1, Final residual = 4.1108316e-09, No Iterations 2
DILUPBiCGStab: Solving for Uy, Initial residual = 1, Final residual = 2.4053866e-08, No Iterations 2
DILUPBiCGStab: Solving for Uz, Initial residual = 1, Final residual = 7.1445854e-08, No Iterations 2
DILUPBiCGStab: Solving for h, Initial residual = 1, Final residual = 5.3058713e-08, No Iterations 3
Min/max T:284.67219 291.08218
I know that after that step something with p_rgh should be next, but then i am just getting a long error message which says floating point exception at the end. So I guess there is a problem with p_rgh or could it be something else? I know that it means, that something is devided by zero.
In the 0 directory for the fluid (air) i use fixedFluxPressure (and fixedValue at the outlet) for p_rgh and calculate for p. Both internalFields are 1e5.
the fluid is standard air, here the thermophysical properties:
Code:
thermoType
{
type heRhoThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState perfectGas;
specie specie;
energy sensibleEnthalpy;
}
mixture
{
specie
{
//nMoles 1;
molWeight 28.9;
}
thermodynamics
{
Cp 1000;
Hf 0;
}
transport
{
mu 1.8e-05;
Pr 0.7;
}
}
fvSchemes:
Code:
ddtSchemes
{
default steadyState;
}
gradSchemes
{
default Gauss linear;
}
divSchemes
{
default none;
div(phi,U) Gauss upwind;
div(phi,K) Gauss linear;
div(phi,h) Gauss upwind;
div(phi,k) Gauss upwind;
div(phi,epsilon) Gauss upwind;
div(phi,omega) Gauss upwind;
div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default corrected;
}
wallDist
{
method meshWave;
}
Code:
solvers
{
rho
{
solver diagonal;
}
rhoFinal
{
$rho;
}
p_rgh
{
solver GAMG;
smoother symGaussSeidel;
tolerance 1e-7;
relTol 0.01;
}
p_rghFinal
{
$p_rgh;
relTol 0;
}
p
{
solver GAMG;
smoother symGaussSeidel;
tolerance 1e-3;
relTol 0.01;
}
p_Final
{
$p;
relTol 0;
}
"(U|h|epsilon|omega)"
{
solver PBiCGStab;
preconditioner DILU;
tolerance 1e-7;
relTol 0.1;
}
"(U|epsilon|omega|h)Final"
{
$U;
relTol 0;
}
}
PIMPLE
{
momentumPredictor yes;
}
relaxationFactors
{
fields
{
p_rgh 0.7;
p_rghFinal 0.3;
rho 1;
rhoFinal 0.1;
}
equations
{
h 0.3;
hFinal 0.3;
U 0.1;
UFinal 0.1;
k 0.1;
//omega 0.1;
//epsilon 0.1;
}
}
I played around with the fvSolution and fvSchemes but the error doesn't go away.
Does somebody have an idea where this error might come from and how to fix it? I would appreciate some help, I have been stuck with this error for days.
Also, let me know if I forgot to give important information.
Thanks! |
