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saran April 11, 2005 08:24

Fluent solver setup

In a fluid flow problem using k-e turb. model I get good convergence however my drag & force results are very large as compared to experiment. I have checked the grid scaling and corrected but still have large difference. Is there any other parameter(s) feed which I have missed? I will be obliged if any one can guide me through this.

Thanks in advance

A.S. April 11, 2005 08:31

Re: Fluent solver setup
Check your wall y+, bring it to range of 30-60.

zxaar April 11, 2005 22:22

Re: Fluent solver setup
check the reference values u have set, are they set properly, if they are not set to correct values, you might see arbit results.

saran April 12, 2005 07:25

Re: Fluent solver setup
Thanks A.S. & Xzaar, I will try your advise and see the results.

saran April 12, 2005 07:31

Re: Fluent solver setup

Could you pls guide me how do I adjust y+

Thanks a lot

A.S. April 12, 2005 09:59

Re: Fluent solver setup
Though y+ adaptation is not prefered, try it. Be careful y+ is based on Cell Centre Distance from wall, not distance of first grid point on the wall. Goto "Resource" section then "Calc" then "Misc". There is a viscous spacing calculator. Give good aprox. values for air foil. Make you near wallmesh based on it (double the value you get)

saran April 12, 2005 10:20

Re: Fluent solver setup
Thanks a lot AS.

s.elayanila May 2, 2005 04:40

Re: Fluent solver setup

Actually I did't get solution converged.I'm not sure about the meshing.Is anything impotant for mesh consideration?

Thank you very much.

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