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Flow regime for internal pipe flow

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Old   November 3, 2016, 07:21
Default Flow regime for internal pipe flow
Sebastian Trunk
Join Date: Mar 2015
Location: Erlangen, Germany
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Hello Foamers,

I am not 100% sure how I should proceed with my simulations. My case/simulation setup looks as follows:

I have a "zeolite-like" ( 3d structure inside a tube. The structure itself consists of 10x10x20 cells, which look similar to those from the picture.
I would like to investigate the effect of superficial gas velocity on the flow field. (0.5 - 7m/s)
I think that for the slow velocities, the flow should be laminar. For the higher velocities it will turn to a turbulent flow.

So, the questions which I could not answer myself are:

1) How do I calculate a Re number? Should I calculate a particle Re number instead of the overall tube Re number for estimating y+?

2) When I start laminar (simpleFoam), how can I find out if my flow is in the transition to turbulent flow?

3) Should I use the kklomega model to scan through all the different velocities with the same case setup? Can I use simpleFoam for every velocity or pimpleFoam for the higher velocities?

Any help is highly appreciated...Thank you for your thoughts!

Best regards,

sisetrun is offline   Reply With Quote


internal flow, re number, turbulence and laminar

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