two different turbulence models at same time, it is possible in Fluent?

Kyoto · July 10, 2013, 20:33

Hello guys!

Sorry for the new thread!

First, I'm a newbie in Ansys Fluent and I'm trying validate a flow passing throug a channel with a roughness pattern. My problem is: I need to use Low Reynolds K-epsilon model inside roughness pattern valley and RSM (Reynolds Stress Model) above is tip. It is possible in Ansys FLuent V13? if yes, how can I do that?

best regards

PS:

the roughness pattern is very similar to this, inside triangles valleys I need to use K-e and RSM above them

Far · July 11, 2013, 09:05

I don't think so.

Kyoto · July 11, 2013, 13:09

and if I use one at one time and another in a different time, would it be possible?

flotus1 · July 12, 2013, 03:39

I hardly think that such a procedure is possible because there are different/additional variables solved in the RSM model. There will be a lack of information at the interface (no matter if the interface is in space or time).

What is the reason for such an approach?

Far · July 12, 2013, 03:42

You have two options:

1. Use low Re RSM model (BSL RSM type)

2. SST model with curvature correction

July 10, 2013, 20:33	two different turbulence models at same time, it is possible in Fluent?	#1
Kyoto New Member Helder Parreiras Join Date: May 2013 Posts: 3 Rep Power: 12	Hello guys! Sorry for the new thread! First, I'm a newbie in Ansys Fluent and I'm trying validate a flow passing throug a channel with a roughness pattern. My problem is: I need to use Low Reynolds K-epsilon model inside roughness pattern valley and RSM (Reynolds Stress Model) above is tip. It is possible in Ansys FLuent V13? if yes, how can I do that? best regards PS: the roughness pattern is very similar to this, inside triangles valleys I need to use K-e and RSM above them

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July 11, 2013, 09:05		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	I don't think so.

July 11, 2013, 13:09		#3
Kyoto New Member Helder Parreiras Join Date: May 2013 Posts: 3 Rep Power: 12	and if I use one at one time and another in a different time, would it be possible?

July 12, 2013, 03:39		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,398 Rep Power: 46	I hardly think that such a procedure is possible because there are different/additional variables solved in the RSM model. There will be a lack of information at the interface (no matter if the interface is in space or time). What is the reason for such an approach?

July 12, 2013, 03:42		#5
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	You have two options: 1. Use low Re RSM model (BSL RSM type) 2. SST model with curvature correction