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-   -   Turbulent viscosity ratio limited to 1.10^5 in boundary layer ingestion (http://www.cfd-online.com/Forums/fluent/102529-turbulent-viscosity-ratio-limited-1-10-5-boundary-layer-ingestion.html)

loicflouriot May 27, 2012 07:31

Turbulent viscosity ratio limited to 1.10^5 in boundary layer ingestion
 
Hello,

I'm trying to do a simulation about boundary layer ingestion by a S-duct.
I've done my meshing quite well I'll say (4% of cells are below 0,3 quality) and I've no errors and my coarse model I want to run on Fluent is a 1 million cells model.

Then I put my mesh on Fluent and run a 12000 iterations. I chose the k-w SST turbulence model where I've calculated the parameters (turbulent dissipation rate....).

But after a few iterations (200) I've this posted message "turbulent viscosity ratio limited to 1.10^5 in XXX cells"

I've red on the forum to change the turbulence model to the k-epsilon RNG. But the k-w SST model is very well adapted for boundary layer simulate right?

So what other option do I have.

For information I should obtain a strong separation of the boundary layer at the duct bend, and even a back flow in the area close to the inner surface of my duct. My Reynolds number is 6,26*10^6 by unit length


Thanks for your help


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