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-   -   when,Ma=0.95,problems of airfoil compution in cfx (http://www.cfd-online.com/Forums/cfx/21285-when-ma-0-95-problems-airfoil-compution-cfx.html)

zuozicheng May 24, 2005 11:04

when,Ma=0.95,problems of airfoil compution in cfx
 
hi all

when Ma=0.95, I am computing an airfoil with a gap , Phiscal time scale=0.005, farfield rule=30 meters , the normal pressure force result is not converging , the transonic computing is so hard in cfx ,and how do I deal with it, my friends, help me!!!

Glenn Horrocks May 24, 2005 18:27

Re: when,Ma=0.95,problems of airfoil compution in
 
Hi,

Start off with a simpler simulation using possibly upwind differencing, a zero equation turbulence model and double precision numbers. Use that simulation as an initial condition for your final run to convergence with high res differencing and a better turbulence model.

Transonic simulations are always tricky to converge. There area a few other suggestions in the documentation.

Regards, Glenn

zuozicheng May 25, 2005 07:18

Re: when,Ma=0.95,problems of airfoil compution in
 
than you very much !


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