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-   -   y+ in a turbulent flow (http://www.cfd-online.com/Forums/fluent/120500-y-turbulent-flow.html)

zacfranki July 8, 2013 11:31

y+ in a turbulent flow
 
Hi everyone,
i'm trying to model the turbulence in a free convective flow. What is an adequate value of y+ (so i can see if the dimension of the grid that i've generated is correct?). Now i'm using k epsilon model with standard wall functions.
David

Thanks

delaneyluke July 10, 2013 12:31

Hi David,
First you decide which turbulence model is best suited for what you're trying to simulate.
Then you decide on the wall treatment you want to use.
You Y+ value will depend on both these things.
For example, the k epsilon model with standard wall functions requires a high value of Y+. generally between 100-300

Thanks & Regards
Luke


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