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Old   February 17, 2009, 10:19
Default CD too high
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i am completing an analysis of a 2D aerofoil in Fluent, i have checked all my reference values and BC values such that the operating conditions are those found at a speed of 0.53 Mach at 20,000ft. i am using the k-epsilon viscous solver and the CL values calculated correlate well with documented data at around 0.6, however the CD values are in the region of 3*10^-2 which seems an order of magnitude too high??? especially when i compare it to other CFD runs i have done in other packages. my supervisor seems to think its something to do with the turbulent length scale, but im not sure what to do. any ideas??

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Old   February 21, 2009, 05:42
Default Re: CD too high
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are u setting Cd or Cl from the first run? if so dont do that..... run without drag settin for atlaest 400 iterations and then set the cd monitoring..

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