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Parallel running stops when sample point sets z=(0,0) using LES |
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May 31, 2023, 11:57
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Parallel running stops when sample point sets z=(0,0) using LES
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#1 |
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New Member
Teresa Sun
Join Date: Jun 2021
Posts: 21
Rep Power: 5  |
Dear Foamer,
Can anyone tell me what's going on? Simulation case: circular cylinder at Re=3900 using LES with the customized model (minimum-dissipation model). The problem happened when sampling along the central line in a streamwise direction, i.e., y=(0,0) and z=(0,0) It works with no problem while running on a single core. But the simulation stops while running in parallel on 128, 64 and 32 cores using simple or scotch decomposition methods. There is no error message and the simulation doesn't exit. This problem can be solved by changing z=(0,0) to z=(0,1e-5), (using a small non-zero value). Why this problem occurs and why it is solved in this way? Code:
controlDict
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 6 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
application RKSymLESFoam;
//startFrom startTime;
startFrom latestTime;
startTime 0;
stopAt endTime;
endTime 500;
deltaT 0.002;
writeControl adjustableRunTime;
writeInterval 20;
purgeWrite 50;
writeFormat ascii;
writePrecision 8;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable yes;
//Not implemented in PISO
adjustTimeStep yes;
maxCo 0.5;
maxDeltaT 0.1;
// ************************************************************************* //
functions
{
inMassFlow
{
type surfaceFieldValue;
libs ("libfieldFunctionObjects.so");
enabled true;
timeStart 100;
writeControl outputTime;
writeInterval 1;
log true;
writeFields false;
regionType patch;
name in;
operation sum;
fields
(
phi
);
}
outMassFlow
{
type surfaceFieldValue;
libs ("libfieldFunctionObjects.so");
enabled true;
timeStart 100;
writeControl outputTime;
writeInterval 1;
log yes;
writeFields false;
regionType patch;
name out;
operation sum;
fields
(
phi
);
}
fieldAverage
{
type fieldAverage;
libs ("libfieldFunctionObjects.so");
enabled true;
timeStart 100;
writeControl timeStep;
//writeInterval 100;
fields
(
U
{
mean on;
prime2Mean on;
base time;
}
p
{
mean on;
prime2Mean on;
base time;
}
);
}
forceCoeffs_object
{
// rhoInf - reference density
// CofR - Centre of rotation
// dragDir - Direction of drag coefficient
// liftDir - Direction of lift coefficient
// pitchAxis - Pitching moment axis
// magUinf - free stream velocity magnitude
// lRef - reference length
// Aref - reference area
type forceCoeffs;
libs ("libforces.so");
//patches ("body1" "body2" "body3");
patches ("cylinder");
pName p;
Uname U;
rho rhoInf;
rhoInf 1.0;
//// Dump to file
log true;
CofR (0.0 0 0);
liftDir (0 0.5 0);
dragDir (0.5 0 0);
pitchAxis (0 0 0.5);
magUInf 1.0;
lRef 1.0; // reference lenght
Aref 3.1415926; // reference area 1 for 2d
writeControl timeStep;
timeStart 100;
writeInterval 1;
}
minmaxdomain
{
type fieldMinMax;
libs ("libfieldFunctionObjects.so");
enabled true;
mode component;
timeStart 100;
writeControl timeStep;
writeInterval 1;
log true;
fields (p U nut);
}
turbulenceFields1
{
type turbulenceFields;
libs (fieldFunctionObjects);
fields (I devReff nut nuEff L);
//fields ( k R I devReff nut nuEff L);
executeControl writeTime;
timeStart 100; // approx 2x flow-throughs
writeControl writeTime;
}
Q1
{
type Q;
libs (fieldFunctionObjects);
timeStart 100; // approx 2x flow-throughs
writeControl writeTime;
}
momErr
{
type momentumError;
libs (fieldFunctionObjects);
timeStart 100; // approx 2x flow-throughs
writeControl writeTime;
}
vorticity1
{
type vorticity;
libs (fieldFunctionObjects);
timeStart 100; // approx 2x flow-throughs
writeControl writeTime;
}
sample
{
type sets;
libs (sampling);
interpolationScheme cellPoint;
setFormat raw;
executeControl writeTime;
writeControl writeTime;
//extract the profile along y axi x=constant,z=0m
Ymin -3;
Ymax 3;
Z 0;
D 1;
yPoints 80;
sets
(
X_by_D_1_06
{
type face;
axis y;
start (#eval{1.06 * $D} $Ymin $Z);
end (#eval{1.06 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_1_54
{
type face;
axis y;
start (#eval{1.54 * $D} $Ymin $Z);
end (#eval{1.54 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_2_02
{
type face;
axis y;
start (#eval{2.02 * $D} $Ymin $Z);
end (#eval{2.02 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_6
{
type face;
axis y;
start (#eval{6.0 * $D} $Ymin $Z);
end (#eval{6.0 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_7
{
type face;
axis y;
start (#eval{7.0 * $D} $Ymin $Z);
end (#eval{7.0 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_10
{
type face;
axis y;
start (#eval{10.0 * $D} $Ymin $Z);
end (#eval{10.0 * $D} $Ymax $Z);
nPoints $yPoints;
}
X_by_D_centralLine
{
type midPoint;
axis x;
start (-1 0 0);
end (20.0 0 0.00001);
nPoints 200;
}
);
fields
(
k nut p pPrime2Mean R I devReff Q
vorticity
U UMean UPrime2Mean grad(U)
);
}
};
Code:
fvSchemes
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 6 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
//default Euler;
default backward;
//default CrankNicolson 0.0;
}
gradSchemes
{
default Gauss linear;
grad(p) Gauss linear;
//default leastSquares;
//default cellMDLimited leastSquares 0.5;
//default cellMDLimited Gauss linear 1;
//grad(U) cellMDLimited Gauss linear 1;
}
divSchemes
{
default none;
div(phi,U) Gauss linear;
//div(phi,U) Gauss filteredLinear;
//div(phi,U) Gauss limitedLinearV 1;
//div(phi,U) Gauss LUST unlimitedGrad(U);
//div(phi,U) Gauss linearUpwind grad(U);
//div(phi,U) Gauss linearUpwindV default;
//div(phi,U) Gauss linearUpwindV grad(U);
div((nuEff*dev2(T(grad(U))))) Gauss linear;
//div(phi,k) Gauss linearUpwind default;
//div(phi,omega) Gauss linearUpwind default;
//div(phi,k) Gauss linear;
//div(phi,omega) Gauss linear;
//div(phi,k) Gauss upwind;
//div(phi,omega) Gauss upwind;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default limited 1;
}
// ************************************************************************* //
Code:
fvSolution
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 6 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
/*
p
{
solver PCG;
preconditioner DIC;
tolerance 1e-06;
relTol 0;
minIter 2;
}
*/
p
{
solver GAMG;
tolerance 1e-6;
relTol 0.01;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
cacheAgglomeration on;
agglomerator faceAreaPair;
nCellsInCoarsestLevel 100;
mergeLevels 1;
minIter 2;
}
pFinal
{
solver PCG;
preconditioner DIC;
tolerance 1e-06;
relTol 0;
minIter 3;
}
U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-08;
relTol 0;
minIter 3;
}
/*
U
{
type coupled;
solver PBiCCCG;
preconditioner DILU;
tolerance (1e-08 1e-08 1e-08);
relTol (0 0 0);
}
*/
UFinal
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-08;
relTol 0;
minIter 3;
}
}
PISO
{
nCorrectors 2;
nNonOrthogonalCorrectors 1;
pRefCell 0;
pRefValue 0;
}
// ************************************************************************* //
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May 31, 2023, 12:06
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#2 |
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New Member
Teresa Sun
Join Date: Jun 2021
Posts: 21
Rep Power: 5 |
Intended to post this in the sub-forum OpenFOAM Running, Solving & CFD.
How to edit it or delete |
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| Tags |
| les, parallel running, sample |
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