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-   -   Piso /transient does not work (http://www.cfd-online.com/Forums/openfoam-solving/94649-piso-transient-does-not-work.html)

aan555 November 22, 2011 05:25

Piso /transient does not work
 
Hello OpenFoamers,

Iam calculating a 3D unstructed mesh. The solver runs through, if I calculate steady state. Now ive tried to switch it to Piso and changed the ControlDict file like below:

*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: http://www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object controlDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
application pisoFoam;

startFrom startTime;

startTime 0;

stopAt endTime;

deltaT 0.005;

endTime 300;

writeControl timeStep;

writeInterval 100;

purgeWrite 1;

writeFormat ascii;

writePrecision 6;

writeCompression uncompressed;

timeFormat general;

timePrecision 6;

runTimeModifiable yes;

adjustTimeStep yes;

maxCo 0.2;

maxDeltaT 1;

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

One Question is:
1) Do I need a moving wall if my contolvolume is already initialised with a velocity?
and i get with piso now the following error message:

Fatal error: face xy area does not match neighbour by 200% -- possible face ordering problem.

i tried to find a solution here, but the threads didnt help me :(

2) Has someone a hint what the problem could be?

Iam pleased about every opinion and thx for now!

Miriam

nimasam November 22, 2011 05:38

it doesn't seem about solver problem! it is about mesh!
do you use the same mesh with other solvers????
could you please upload your mesh

aan555 November 22, 2011 05:51

i use exactly the same mesh, i used before, i already get a solution with this mesh, but with steady state.
what file do you want to see, if you wanna see the mesh?

darai November 22, 2011 08:45

Mesh
 
To post the mesh you should probably zip the whole constant/polyMesh subdirectory... if it isn't too large.

aan555 November 24, 2011 10:13

sorry, its not possible to upload my mesh. Could you please give me some hints youre looking especially at, when youre using the PISO Solver?

Thanks!

Chris Lucas November 25, 2011 03:51

Hi,

could you upload the checkMesh result. What steady state and what transient solver do you use. Could you upload the fvSolution and fvScheme files for both cases

Best Regards,
Christian

wiedangel November 29, 2011 17:41

Quote:

Originally Posted by aan555 (Post 333034)

Fatal error: face xy area does not match neighbour by 200% -- possible face ordering problem.


i think the problem with "Fatal error: face xy area does not match neighbour by 200% -- possible face ordering problem." comes from the cyclic boundary conditions being applied, if it is the case just increase the tolerance in the file constant/polymesh/boundary where your cyclic patch is. I hope it will help

Which time scheme did you use with piso?

aan555 November 30, 2011 06:12

I used Euler for the time scheme.
You were right, the problem were a mesh with a bad resolution at a cyclic patch. Well, i solved that with a new mesh, but now i got a new error message, which i dont understand:

incorrect first token, expected '(', found on line x the punctation token ')'
From function operator>>(Istream&, List<T>&)
in file .../ListIO.C

i just put it in here, maybe some know where that come from?

Thx!

wiedangel November 30, 2011 06:35

Quote:

Originally Posted by aan555 (Post 334096)
I used Euler for the time scheme.
You were right, the problem were a mesh with a bad resolution at a cyclic patch. Well, i solved that with a new mesh, but now i got a new error message, which i dont understand:

incorrect first token, expected '(', found on line x the punctation token ')'
From function operator>>(Istream&, List<T>&)
in file .../ListIO.C

i just put it in here, maybe some know where that come from?

Thx!

when do you get this error? when you execute blockMesh or the solver?

aan555 November 30, 2011 06:41

when i excecute the solver


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