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Old   December 15, 2017, 09:22
Default Turbulence model
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Farid Farid
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I have to simulate a flow in 2.5m pipe with a diametre of 6mm.

I'm currently using K epsilon turbulence model, but the simulation keeps crashing for different mass flows of air. We're talking here of 2g/s, 1g/s and 0.66 g/s.

The goal is to calculate the pressure drop in the system.

Is there a specific turbulence model to use for small diametre pipes ?

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Old   December 19, 2017, 07:52
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Marco Riedel
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Hello Farid,
k-eps should work. I think you have to look on your mesh. Try to calculate the distance of the first layer with that tool and apply the wall distance of the first cell to your mesh.
If you consider y+ as 1 or smaller, then you should switch to the standard k-eps Model with Low y+ Wall Treatment. Generally you should avoid y+ Values between 1 and 30.
Best regard
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cras, pressure and velocity, starccm+, turbulence

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