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How to define the values of k and epsilon in pimplefoam?

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Old   April 18, 2024, 09:42
Default How to define the values of k and epsilon in pimplefoam?
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mo magd
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Hi all,


I'm new to turbuluence modeling and not sure how I should specify the values of k and epsilon in zero directory for the problem I'm trying to simulate. I'm trying to simulate a mixing process in a micromixer device but when i put the values of k and epsilon close to zero ( since I initilize the flow field with zero velocity) the simulation crashes but when i put the values equal to 1, it converges. However, when I increase the value of velocity for analyzing higher Reynolds number, my simulation crashes again even with k and epsilon = 1. So I was wondering how I should define these values and whether I need to change them case by case if I change the velocity magnitude?


Thanks so much for your help.
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k-epsilon model, pimple. openfoam, turbule modelling

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