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Old   March 7, 2010, 12:51
Default What an idiot I have been.
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Jonny
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Hi, I just thought I'd write and say how much of an idiot I have been this morning, plus it might help some people on here.

I have been looking at wing profiles and this morning was going to run a few cases to evaluate some ideas.
So I drew the profiles in CATIA and meshed them in Gambit ready for Fluent.

I then set the case up in Fluent but the solution would be all over the place and no chance of converging. There seemed to be a turbulent viscosity ratio issue so I looked at the contours and the whole area behind the wing was the problem area.

I then ran adaptions every 100 itterations to try and help things, relaxed URFs. Then as a final option I completely change viscosity model just to see if I could get any sort of convergence. Spent most of this morning on this.

I have now just realized I forgot to scale down the grid!!

Now I get a converged solution after less than 2000 itts.

Anyway, just thought it was a bit of a funny story. I suppose you can get caught up in all kind of technical problems sometimes rather than look at the most basic thing.
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Old   March 7, 2010, 15:24
Default Got that T-short already
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Charles
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Ah yes, been there, done that. Amazing how nasty airfoils become at a Re-number of 3 billion
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