Sustaining terms to prevent decay: SST k-w

Adithya_11 · January 13, 2022, 03:31

Hi
I have been reading some literature by Spalart, Rumsey, and others who developed the CFD codes.
They talk about the importance of having sustaining terms in the SST k-w model to prevent decay of turbulence and reducing the grid dependence on transition behaviour.

In my own Fluent simulations, I do not see a drop in the value of TKE and omega from the inlet to the wing. I have a distance of approximately 50 chord lengths from the inlet to the leading edge.

Does Fluent have sustaining terms defined in it?
Or is the drop just too small to numerically visualise?
Or is the best way to check its decay is by plotting post-processing the boundary layer and finding the point where it goes fully turbulent, i.e mu_t/mu >=1?
Should I be defining source terms into my fluid domain to sustain the turbulence?

AlexanderZ · January 13, 2022, 06:58

did you turn on intermittency transition model?

you may also try to use Transition SST model (4equtions)

January 13, 2022, 03:31	Sustaining terms to prevent decay: SST k-w	#1
Adithya_11 Member Adithya Join Date: May 2021 Posts: 73 Rep Power: 4	Hi I have been reading some literature by Spalart, Rumsey, and others who developed the CFD codes. They talk about the importance of having sustaining terms in the SST k-w model to prevent decay of turbulence and reducing the grid dependence on transition behaviour. In my own Fluent simulations, I do not see a drop in the value of TKE and omega from the inlet to the wing. I have a distance of approximately 50 chord lengths from the inlet to the leading edge. Does Fluent have sustaining terms defined in it? Or is the drop just too small to numerically visualise? Or is the best way to check its decay is by plotting post-processing the boundary layer and finding the point where it goes fully turbulent, i.e mu_t/mu >=1? Should I be defining source terms into my fluid domain to sustain the turbulence?

January 13, 2022, 06:58		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	did you turn on intermittency transition model? you may also try to use Transition SST model (4equtions) __________________ best regards ****************************** press LIKE if this message was helpful

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