CFD Online Discussion Forums - Turbulence models

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- OpenFOAM Running, Solving & CFD (https://www.cfd-online.com/Forums/openfoam-solving/)

- - Turbulence models (https://www.cfd-online.com/Forums/openfoam-solving/191889-turbulence-models.html)

Turbulence models

Dear Respected members,

Since I am new to CFD simulations, I got a problem:-
1. When I run my case [k-epsilon turbulence model], I got a warning message, see the attached photo. What could be the possible mistake I made? I can not post process it (I can’t see any thing on the para-view).
2.What is the distinction that I get on the velocity profile after using turbulence model and the velocity profile I get with out using the turbulence model?

Kind regards,
Gerie

Hi Gerie,

1. Seems like you are trying to link dynamically a library (swak4Foam) which you do not have installed. If you do not need swak4Foam, just remove the libs entry in system/controlDict which should look something like this:

Code:

    

libs 

    ( 

      "libOpenFOAM.so"

      "libsimpleSwakFunctionObjects.so"

      "libswakFunctionObjects.so"

      "libgroovyBC.so"

    );

2. If the turbulence model that you are using is perfect (it is not), then the velocity profiles should look the same. Otherwise, the difference is the modeling error induced by the turbulence model. Obviously, I assume that you are doing things right so for instance you have adequate mesh resolution for the simulation without turbulence model (DNS).

Regards, Mikko

Dear Mikko,
Thank you so much, it works!
Kind regards,
Gerie