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Initialisation of Reynolds Stress Model (RSM) in elsA software

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Old   July 24, 2017, 09:40
Exclamation Initialisation of Reynolds Stress Model (RSM) in elsA software
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Hidir ABAY
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Hello everybody

First, excuse me for my poor English I am french so I am limited..

I am trying to solve a nozzle flow with the RSM model and I am blocked with the initialisation.

I have to calculate rho*u*u, rho*u*v, [...] and the other components of Reynolds Stress tensor for the boundary conditions. But I don't know how to calculate them.

The previous model I used was k-eps and the data was different.

I Hope you could help me.

Thanks a lot,

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Old   July 25, 2017, 10:28
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Originally Posted by HidirAbay View Post
First, excuse me for my poor English I am french so I am limited..
Don't be so hard on yourself

Jokes apart, if what you need is boundary conditions (which are different from initialization) and your inlet can ideally be assimilated to a section of a long pipe, you can try solving the RSM in a periodic pipe with that cross section. You can then use that solution as inlet profile for your actual case.

I used this approach to produce inlet for LES computations (which, in turn, need the Reynolds stresses). However, this is not specifically related to elsA, and you need to verify the feasibility of the approach with it. Also, your inlet might not be assimilated to a section of along pipe, in which case I have no specific answer (i guess your only chance then is to specify k and resort to the isotropy condition).
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boundary conditions, elsa, reynolds stress model, rsm, turbulence

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