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Old   January 13, 2014, 07:08
Question How do I know which solver
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Marvin
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Hello,

I'm a student and my task is to compile some openFOAM cases.

I've done the basic examples of the tutorial on the OpenFOAM homepage, but I'm still newbie.

My question is:

How do I know which solver I have to use?
SimpleFoam, nonEulerianPolyFoam, icoFoam etc.
Can I find a hint in any of the documents, which to use?

The problem is that all solvers I have tried randomly, there are always undefined keywords in "transport properties" like nu.

Thanks for your help

Marvin
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Old   January 13, 2014, 07:37
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Dear Marvin,

you can have a look at the following site to check which solver you have to use for your Problem.

http://www.openfoam.org/features/standard-solvers.php


What is the Problem with "nu" ? it is the kinematic viscosity (laminar) - you can have a look into the source code of the thermodynamics. You will find comments which give you the Information about a variable.

Additionally you can use doxygen http://www.openfoam.org/docs/cpp/


Normally you have mu in the navier-stokes-equation but in the incompressilbe solvers everything is divided with the density so mu/rho = nu.

Therefor you Need nu in the transportProperties.
In other solvers you will have to define mu.

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Tobi
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Old   January 13, 2014, 08:23
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Dear Tobi,

thanks for your fast advice. Indeed rho is defined in transport properties. But not mu.

My advisor told me now I should try viscoelasticinterFoam. I can't find such a solver, nor in your link neither is it implemented in my OpenFoam.

Instead I tried interFoam. There I received the following mistake.

FOAM FATAL IO ERROR:
keyword PIMPLE is undefined in dictionary "/home/marvin/OpenFOAM/marvin-2.2.1/run/Test/system/fvSolution"

file: /home/marvin/OpenFOAM/marvin-2.2.1/run/Test/system/fvSolution at line 27.

Already changed PICO in PIMPLE but didn't work.
Do you have any clue what I can try?

Thanks Marvin
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Old   January 13, 2014, 08:52
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I only know the solver - viscoelasticFluidFoam - but that is included in the extend version.

The solver is telling you how variable it needs if there is some missing.
The best way is, copying a tutorial case and Change the necessary files.


In your case with the tutorial:

1. wrong tutorial Version
2. damaged tutorial (but I think that is not the case)
3. you did something wrong


I am not able to help you because I dont know which steps you are doing.
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Old   January 13, 2014, 08:54
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If you can't find a solver in the mainline OF-version, it is usually part of the extend-project.

Regarding PIMPLE. Are all the brackets closed?
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Old   January 13, 2014, 11:39
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Thanks for your help. Now I've seen there are also some libaries I have to extract from the extended project. I hope this works.
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