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Freestream boundary condition confusion - k-epsilon

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Old   July 11, 2014, 06:13
Default Freestream boundary condition confusion - k-epsilon
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Hi all,

I have only been working with OpenFoam for the past few days but have worked with FLUENT before. The simulation is of 2D water flow past three pillars in a freestream with an absolute pressure of 50.27bar

I am confused what free stream boundary conditions I should be using, preferably for use with k-epsilon

My current BC are

inlet (note, internalField is (1 0 0))

U: type fixedValue;
freestreamValue $internalField;

P: type zeroGradient;

k: type fixedValue;
value uniform 18.375;

epsilon: type fixedValue;
value uniform 3.6975;

outlet
U: type zeroGradient;

P: type fixedValue;
value $internalField (set as 50.27e5)

k: type zeroGradient;

epsilon: type zeroGradient;

symmetry 1,2,3,4

type symmetryPlane for all

wall 1,2,3

U: type fixedValue;
value uniform (0 0 0);

P: type zeroGradient;

k: type zeroGradient

epsilon: type zeroGradient

I have been trying to adjust tutorials to fit my setup, but so far nothing is working. Please be as brutal and honest as necessary, I'm sure all of this is complete garbage... but I just want to start understanding where I'm going wrong.

Thanks,

Ed

Edit: the error message that I get now is:
PHP Code:
Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1  Foam::sigFpe::sigHandler(int) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2   in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4  
 
in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/simpleFoam"
#5  
 
in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/simpleFoam"
#6  
 
in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/simpleFoam"
#7  
 
in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/simpleFoam"
#8  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#9  
 
in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/simpleFoam" 
with no other error messages in the log file:

PHP Code:
Create time

Create mesh 
for time 0

Reading field p

Reading field U

Reading
/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model kEpsilon
kEpsilonCoeffs
{
    
Cmu             0.09;
    
C1              1.44;
    
C2              1.92;
    
C3              -0.33;
    
sigmak          1;
    
sigmaEps        1.44;
    
Prt             1;
}

No finite volume options present


SIMPLE
convergence criteria
    field p     tolerance 0.01
    field U     tolerance 0.001
    field k     tolerance 0.001


Starting time loop

Time 
0.5 
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File Type: jpg Screenshot from 2014-07-11 11:10:26.jpg (65.5 KB, 7 views)

Last edited by Jalued; July 11, 2014 at 08:45.
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