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ERROR : Floating point exception (core dumped)

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Old   November 14, 2013, 02:27
Exclamation ERROR : Floating point exception (core dumped)
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Hi
I am simulating a overflow valve with simple foam.
Velocity of fluid is 0.27 m/s
Dynamic Viscosity = 8.26 X 10^-6 Kg/m.s
Density = 830 Kg / m3
Radius of the inlet = 6.9 mm

I am getting the error which is attached and also looked in to many discussions on this topic but not able to fix this issue..
Please help me
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File Type: jpg Screenshot from 2013-11-14 11:03:45.jpg (87.6 KB, 12 views)
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Old   November 14, 2013, 05:33
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Martin Beeger
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Your viscosity maybe too small. Try a bigger value and see if this fixes your error.
This shown error is a preconditioner failure, if increasing viscosity does not help try tuning preconditioner parameters.
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Old   November 14, 2013, 06:00
Post simpleFOAM SOLVER
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[FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

solvers
{
p
{
solver PCG;
preconditioner DIC;
tolerance 1e-06;
relTol 0.01;
}

U
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0.1;
}

k
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0.1;
}

epsilon
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0.1;
}

R
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0.1;
}

nuTilda
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-05;
relTol 0.1;
}
}

SIMPLE
{
nNonOrthogonalCorrectors 2;
pRefCell 101;
pRefCell 58;
pRefCell 767;
pRefCell 527;
pRefValue 0;
residualControl
{
p 1e-2;
U 1e-3;
"(k|epsilon|omega)" 1e-3;
}
}

relaxationFactors
{
fields
{
p 0.3;
}
equations
{
U 0.7;
k 0.7;
epsilon 0.7;
R 0.7;
nuTilda 0.7;
}
}


// ************************************************** *********************** //]

THis is the solver file... Please check let me know anything need to be changed ?
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Old   November 14, 2013, 06:40
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Martin Beeger
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Try setting the dynamic viscosity to a bigger value (like 8e-3 instead of 8e-6). I don't actually know which changes you have to make to get you preconditioner able to handle these viscosities.
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Old   November 14, 2013, 07:03
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Hi,
I should not change dynamic viscosity as these are defined values for my case ...
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