Help with basics, Full potential solver

jasonbot · May 29, 2013, 11:21

Good day,

I'm busy with a masters with a strong focus on CFD. At the moment I am validating some current results (airfoil polars) with a program called MSES written by Mark Drela. The software generates a grid and solves with a Euler solver or a Full Potential Solver or a combination of the two.

When running in inviscid mode I get failure to converge the solution when using the full potential or combined solvers near the stall angle.

Can someone point me to a good source (mind the pun) of where to get info about why this would be the case, or alternatively explain what is going on?

Thanks,
Jasonbot

duri · June 3, 2013, 09:57

Hi,

MISES is a euler solver along the stream lines. i.e., mesh lines are represented by streamlines. But still a Euler solver and not irrotational. Near the stall there could be possiblity of wake behind the airfoil. In this case, as mesh was constructed by streamline distribution, near wake mesh can rotate and creates negative volume.
To check this stop solver before divergence or crash iteration and check the new mesh, you can see twist or something like that.

Thanks

May 29, 2013, 11:21	Help with basics, Full potential solver	#1
jasonbot Member Jason Join Date: May 2013 Location: South Africa Posts: 32 Rep Power: 13	Good day, I'm busy with a masters with a strong focus on CFD. At the moment I am validating some current results (airfoil polars) with a program called MSES written by Mark Drela. The software generates a grid and solves with a Euler solver or a Full Potential Solver or a combination of the two. When running in inviscid mode I get failure to converge the solution when using the full potential or combined solvers near the stall angle. Can someone point me to a good source (mind the pun) of where to get info about why this would be the case, or alternatively explain what is going on? Thanks, Jasonbot

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June 3, 2013, 09:57		#2
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 17	Hi, MISES is a euler solver along the stream lines. i.e., mesh lines are represented by streamlines. But still a Euler solver and not irrotational. Near the stall there could be possiblity of wake behind the airfoil. In this case, as mesh was constructed by streamline distribution, near wake mesh can rotate and creates negative volume. To check this stop solver before divergence or crash iteration and check the new mesh, you can see twist or something like that. Thanks