pimpleFoam - lower nonzero limit for the production term in k transport equation

cyln · April 12, 2018, 04:27

Hello,

I am running a transient turbulent simulation using pimpleFoam. The turbulence model is k-omega-SST.

I am trying to make sure the solver does not impose a lower nonzero limit for the production term in k transport equation. When I set k to machine zero (meaning eddy viscosity = 0), the production term should go to zero.

I do this to obtain a laminar boundary layer development in a specific region of my computational domain.

Can anybody illuminate me on this issue?

Cheers,
Cyln

TobM · April 12, 2018, 05:34

In the omega equation in kOmega.C one term is devided by k.
This is the reason why the minimum of k is SMALL.

April 12, 2018, 04:27	pimpleFoam - lower nonzero limit for the production term in k transport equation	#1
cyln Senior Member cyln Join Date: Jul 2016 Posts: 102 Rep Power: 10	Hello, I am running a transient turbulent simulation using pimpleFoam. The turbulence model is k-omega-SST. I am trying to make sure the solver does not impose a lower nonzero limit for the production term in k transport equation. When I set k to machine zero (meaning eddy viscosity = 0), the production term should go to zero. I do this to obtain a laminar boundary layer development in a specific region of my computational domain. Can anybody illuminate me on this issue? Cheers, Cyln

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April 12, 2018, 05:34		#2
TobM Member Join Date: Sep 2014 Location: Germany Posts: 88 Rep Power: 12	In the omega equation in kOmega.C one term is devided by k. This is the reason why the minimum of k is SMALL.