How do I know which solver

Marvin_Rauch · January 13, 2014, 06:08

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

Tobi · January 13, 2014, 06:37

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.

Regards
Tobi

Marvin_Rauch · January 13, 2014, 07:23

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

Tobi · January 13, 2014, 07:52

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.

Kaskade · January 13, 2014, 07:54

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?

Marvin_Rauch · January 13, 2014, 10:39

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.

January 13, 2014, 06:08	How do I know which solver	#1
Marvin_Rauch New Member Marvin Join Date: Jan 2014 Posts: 11 Rep Power: 12	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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January 13, 2014, 06:37		#2
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	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. Regards Tobi

January 13, 2014, 07:23		#3
Marvin_Rauch New Member Marvin Join Date: Jan 2014 Posts: 11 Rep Power: 12	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

January 13, 2014, 07:52		#4
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	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.

January 13, 2014, 07:54		#5
Kaskade Senior Member Onno Join Date: Jan 2012 Location: Germany Posts: 120 Rep Power: 15	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?

January 13, 2014, 10:39		#6
Marvin_Rauch New Member Marvin Join Date: Jan 2014 Posts: 11 Rep Power: 12	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.