[smhk]

Hi.
How is it possible to use different turbulence models for each domain? (eg Shear Stress Transport for one part and k-ε for the other. I have tried disabling constant domain physics form options but, it gives me errors about interfaces or some quantities related to turbulence models:

 +--------------------------------------------------------------------+
 | ERROR #001100279 has occurred in subroutine ErrAction.             |
 | Message:                                                           |
 | Equation subsystem: "Wall Scale" has not been found on both sides  |
 | of interface "P1 to P2". Check that you have set consistent phys-  |
 | ics across all domains that use this interface.                    |
 |                                                                    |
 |                                                                    |
 |                                                                    |
 +--------------------------------------------------------------------+
 
 +--------------------------------------------------------------------+
 | ERROR #001100279 has occurred in subroutine ErrAction.             |
 | Message:                                                           |
 | Stopped in routine DEF_ALGM_SUBSYS_ZIF

I wanted to know if it is possible to do a simulation with different turbulence models for different domains using Ansys CFX. If yes, then how can I do it? (Are there any resources like videos or books?) If not, is there another option, like coupling different domains with different models somehow?
Or using other packages like OpenFOAM?

Kind Regards.

[Gert-Jan]

I know it should be possible. I used it in a system with 3 different domains. I had 1) a laminar gas domain, 2) a turbulent water channel, and 3) a metal conducting solid in between. Here the 2 fluid volumes are physically separated.

Is this also the case in your geometry?

[smhk]

Originally Posted by Gert-Jan

I know it should be possible. I used it in a system with 3 different domains. I had 1) a laminar gas domain, 2) a turbulent water channel, and 3) a metal conducting solid in between. Here the 2 fluid volumes are physically separated.

Is this also the case in your geometry?

Thank you for your response.
No, it is just water that goes through different domains. Fluid domains are not separated by solid parts.

[Gert-Jan]

Then I expect it is not possible.

Main question is: Why would you like to do this? Any reason to not use SST all over?

I never use k-e. I only deviate from SST when the application requires this. Then I end up at to RSM, DES, LES, etc.

[smhk]

Originally Posted by Gert-Jan

Then I expect it is not possible.

Main question is: Why would you like to do this? Any reason to not use SST all over?

I never use k-e. I only deviate from SST when the application requires this. Then I end up at to RSM, DES, LES, etc.

I wanted to explore the possibility and effects of using multiple turbulence models. I don't intend to use the k-epsilon model specifically; I'm just mentioning it as an example.

[Opaque]

Originally Posted by smhk

I wanted to explore the possibility and effects of using multiple turbulence models. I don't intend to use the k-epsilon model specifically; I'm just mentioning it as an example.

If there is no goal ahead, you will probably spend useful time with no benefit.

Do you understand the differences between the two models? Based on those initial differences, you may be able to predict if the simulation will be worth doing.

My 2c