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Old   March 24, 2017, 13:36
Default Unexpected restart solutions
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Oliver V
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Hello all,

I'm using SU2/5.0.0 and I'm trying to get a wing polar at different AoAs. I assumed that once a calculation for a given AoA1 (say 8) was finished I could accelerate the calculation for AoA2 = 9 by simply restarting the solution and changing the angle in the cfg file from 8 to 9.

However this leads to a very quickly convergence .... to the values of AoA = 8!

I tried running AoA = 9 from ground zero and it yields very different results than when I try restarting based on AoA = 8.

I was able to do this kind of procedure before but now I can't.

I'm thinking that it has to do with my convergence criteria (which is relatively strict). It makes me think that starting from a previously converged state makes it so that it takes too long for the new information (change of AoA) on the farfield to reach the cells around the wing... which "converge" faster than the new information can arrive.

btw, I use a Cauchy criteria on the CL for 4000k iterations

Has anybody come across this? Any advice?

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