| silviliril |
May 18, 2018 03:31 |
alpha value negative
Hi,
I am trying to simulate condensation problem using phaseChangeHeatFoam using Dynamic Mesh. But, I am getting following error. Where Value of alpha is going -751. WHich is non physical.
Quote:
Create time
Create mesh for time = 0.001
Selecting dynamicFvMesh dynamicRefineFvMesh
Reading field p_rgh
Reading field T
Reading field alpha1
Reading field U
Reading/calculating face flux field phi
Creating phaseChangeTwoPhaseMixture
Selecting phaseChange model Hardt
Selecting incompressible transport model Newtonian
Selecting incompressible transport model Newtonian
Selecting turbulence model type laminar
Reading g
Reading hRef
Calculating field g.h
No finite volume options present
Creating field kinetic energy K
PIMPLE: Operating solver in PISO mode
time step continuity errors : sum local = 0, global = 0, cumulative = 0
GAMGPCG: Solving for pcorr, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
Courant Number mean: 0 max: 0
Starting time loop
Interface Courant Number mean: 0 max: 0
Courant Number mean: 0 max: 0
deltaT = 0.001
Time = 0.002
Selected 20000 cells for refinement out of 1285000.
Refined from 1285000 to 1425000 cells.
Selected 0 split points out of a possible 20000.
Execution time for mesh.update() = 9.29 s
time step continuity errors : sum local = 0.63639, global = 6.51141e-17, cumulative = 6.51141e-17
GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 7.59271e-05, No Iterations 4
time step continuity errors : sum local = 4.83193e-05, global = -1.52192e-06, cumulative = -1.52192e-06
MULES: Solving for alpha1
Liquid phase volume fraction = 0.495664 Min(alpha1) = -751.483 Max(alpha1) = 616.829
MULES: Solving for alpha1
Liquid phase volume fraction = 0.746649 Min(alpha1) = -562573 Max(alpha1) = 570996
MULES: Solving for alpha1
Liquid phase volume fraction = -79.9499 Min(alpha1) = -1.04484e+09 Max(alpha1) = 4.82987e+08
DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 911.698, No Iterations 1001
DILUPBiCG: Solving for Uy, Initial residual = 0.918964, Final residual = 5515.72, No Iterations 1001
DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 49428.4, No Iterations 1001
#0 Foam::error::printStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMa trix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6 Foam::fvMatrix<double>::solveSegregated(Foam::dict ionary const&) at ??:?
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
#8
at ??:?
#9 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#10
at ??:?
Floating point exception (core dumped)
|
fvschemes:
Code:
Code:
ddtSchemes
{
default Euler;
}
gradSchemes
{
default Gauss linear;
}
divSchemes
{
div(rho*phi,U) Gauss upwind;
div(rhoPhi,U) Gauss vanLeerV;
div(phi,T) Gauss vanLeer;
div(rhoPhi,T) Gauss vanLeer;
div(phi,alpha) Gauss vanLeer01;
div(phirb,alpha) Gauss interfaceCompression;
div((muEff*dev(T(grad(U))))) Gauss linear;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default no;
p_rgh;
pcorr;
alpha;
}
fvsolution:
Code:
solvers
{
alpha1
{
maxUnboundedness 1e-5;
CoCoeff 2;
maxIter 5;
nLimiterIter 2;
solver PBiCG;
preconditioner DILU;
tolerance 1e-12;
relTol 0.01;
};
"(U|UFinal|T|TFinal)"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-06;
relTol 0;
};
"(p_rgh|p)"
{
solver PCG;
preconditioner
{
preconditioner GAMG;
tolerance 1e-08;
relTol 0;
nVcycles 2;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
tolerance 1e-08;
relTol 0.001;
maxIter 20;
};
pcorr
{
solver PCG;
preconditioner
{
preconditioner GAMG;
tolerance 0.001;
relTol 0;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration false;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
tolerance 0.0001;
relTol 0;
maxIter 100;
};
"(p_rghFinal|pFinal)"
{
solver PCG;
preconditioner
{
preconditioner GAMG;
tolerance 1e-08;
relTol 0;
nVcycles 2;
smoother GaussSeidel;
nPreSweeps 2;
nPostSweeps 0;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
tolerance 1e-08;
relTol 0;
};
p_rgh
{
solver GAMG;
tolerance 1e-08;
relTol 0.05;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
p_rghFinal
{
solver PCG;
preconditioner
{
preconditioner GAMG;
tolerance 1e-08;
relTol 0;
nVcycles 2;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
nFinestSweeps 2;
cacheAgglomeration true;
nCellsInCoarsestLevel 10;
agglomerator faceAreaPair;
mergeLevels 1;
}
tolerance 1e-08;
relTol 0;
maxIter 20;
}
U
{
solver smoothSolver;
smoother GaussSeidel;
tolerance 1e-06;
relTol 0;
nSweeps 1;
}
"(k|B|nuTilda)"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-08;
relTol 0;
}
/* T //add
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0;
};
/*TFinal //added
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0;
}; */
"(T|TFinal)"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0;
};
rho //add
{
solver Diagonal;
tolerance 1e-8;
relTol 0;
};
}
relaxationFactors
{
T 0.3
U 0.3
p 0.3;
}
"(PISO|PIMPLE)"
{
momentumPredictor yes;
nCorrectors 3;
nNonOrthogonalCorrectors 0;
nAlphaCorr 1;
nAlphaSubCycles 3;
cAlpha 1;
pRefPoint (0.51 0.51 0.51);
pRefValue 0;
smoothItr 2;
kSmoothItr 0;
}
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