Different turbulence models in different volumes (2)

Gert-Jan · April 25, 2018, 09:09

Hi all,

I have a case with two separated volumes A&B. I want to use k-omega-SST in volume A and RSM in volume B. Is that possible in Fluent? If so, can someone tell me how to do that?

Regs, Gert-Jan

LuckyTran · April 25, 2018, 12:17

Are your volumes disjoint or connected? If they are disjoint, just run them separately.

The short answer is no, at least not within the same .case file. You'd have to connect them across simulations, which is similar to running them separately. The reason this is not allowed, is because the algorithm to chop up the mesh when you run in parallel doesn't know which physics belongs to each region. Assuming you could chop up the mesh, then you have a load balancing problem that is better avoided.

Gert-Jan · April 25, 2018, 17:17

It concerns a case with hot gas and cold water separated by a conducting metal wall.

Fluent allows to run a certain region in Laminar. Also it knows which domain is solid or fluid. Or gas with varying properties versus water with constant properties. Therefore, physics are varying throughout my case anyway.

It is possible to setup domains with different physics in CFX via a beta function. I was hoping something similar was available in Fluent.

April 25, 2018, 09:09	Different turbulence models in different volumes (2)	#1
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Hi all, I have a case with two separated volumes A&B. I want to use k-omega-SST in volume A and RSM in volume B. Is that possible in Fluent? If so, can someone tell me how to do that? Regs, Gert-Jan

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April 25, 2018, 12:17		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Are your volumes disjoint or connected? If they are disjoint, just run them separately. The short answer is no, at least not within the same .case file. You'd have to connect them across simulations, which is similar to running them separately. The reason this is not allowed, is because the algorithm to chop up the mesh when you run in parallel doesn't know which physics belongs to each region. Assuming you could chop up the mesh, then you have a load balancing problem that is better avoided.

April 25, 2018, 17:17		#3
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	It concerns a case with hot gas and cold water separated by a conducting metal wall. Fluent allows to run a certain region in Laminar. Also it knows which domain is solid or fluid. Or gas with varying properties versus water with constant properties. Therefore, physics are varying throughout my case anyway. It is possible to setup domains with different physics in CFX via a beta function. I was hoping something similar was available in Fluent.