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-   -   SST turbulence model and transition (http://www.cfd-online.com/Forums/cfx/72461-sst-turbulence-model-transition.html)

TWaung February 5, 2010 23:51

SST turbulence model and transition
 
Hi,

I would just like to confirm that when one sets the SST transitional turbulence to 'fully turbulent', the boundary layer is set to be entirely a turbulent boundary layer. I don't see this stated explicitly in the manual, so I was just wondering if someone could confirm this is true.

Thanks

triple_r February 7, 2010 15:13

Hi,

If you select the fully turbulent option, CFX will not solve the two extra transport equations, intermittency and transition Re, and it will act like other turbulence models, assuming flow is turbulent everywhere (except laminar sub-layer, if you use enhanced wall treatment).

I hope this answers your question.

ttu004 March 12, 2014 20:45

Difference in default SST and SST fully turbulence model
 
Quote:

Originally Posted by triple_r (Post 245264)
Hi,

If you select the fully turbulent option, CFX will not solve the two extra transport equations, intermittency and transition Re, and it will act like other turbulence models, assuming flow is turbulent everywhere (except laminar sub-layer, if you use enhanced wall treatment).

I hope this answers your question.

Sorry to bring this old thread up again.
I have exactly the same question in mind.

So having fully turbulence turned on under transitional turbulence of SST model is same as having a default SST turbulence model (without activating transitional turbulence option) - the two-equation eddy-viscosity mode. Is this correct?

Cheers
Tom

ghorrocks March 12, 2014 22:57

That is certainly the intention. I would check the modelled equations in the documentation to see if there is any mathematical difference however.

ttu004 March 12, 2014 23:36

Quote:

Originally Posted by ghorrocks (Post 479659)
That is certainly the intention. I would check the modelled equations in the documentation to see if there is any mathematical difference however.

Thanks, Glenn


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