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-   -   Modelling flow separation over airfoil at stall (http://www.cfd-online.com/Forums/main/13450-modelling-flow-separation-over-airfoil-stall.html)

Kelvin May 13, 2007 01:59

Modelling flow separation over airfoil at stall
 
Hi, I'm very new to Fluent and Gambit and CFD but I have worked the examples in the Cornell tutorials. My question is, what type of turbulence model I should use to model the flow separation of an airfoil and how fine should the C-grid be to accurately obtain the section lift coefficient at that particular angle of attack (AOA) or higher AOA?

Previously I've used the SST k-w model with the grid being the same as the one in the Fluent tutorial by Cornell for the NACA 0012 airfoil. It has 12150 elements. The stall angle was off by about 2 degrees and the Cl obtained above it does not even approximate the experimental data. Any help in resolving this is greatly appreciated. Comments and extra readings please tell me about it. Really like to know more.

Thanks.

ztdep May 13, 2007 02:15

Re: Modelling flow separation over airfoil at stal
 
Generally, we decide the grid by try experiments.


to May 13, 2007 12:10

Re: Modelling flow separation over airfoil at stal
 
Hi,

The precise stall angle prediction is still an open research topic.

Just forget to find it, especially using rough tools.

You may someday finally find it for a given airfoil with a given turbulence model, but most probably your recipe will fail for another case.

Regards

to

adham May 24, 2007 12:12

Re: Modelling flow separation over airfoil at stal
 
I went any thing in separation flow over airfoil

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