Hello- Why the continuity residual never decreases below 1e-3?

Jorg · August 28, 2012, 17:26

Hi, im performing a set of simulations on an subsonic elliptical airfoil and i´ve noted that the only residual that is not reaching the desired tolerance is the continuity one, it never goes below 1e-3? can there be a reason for it, does it means that the simulation setup is wrong?

siara817 · August 29, 2012, 04:21

I think it is nice to stop other solvers and let the continuity solver work lonely. Then see if it converges very well or not. If again it did not converge well, you need to check your mesh quality.

mali28 · August 29, 2012, 07:51

Quote:

Originally Posted by Jorg

Hi, im performing a set of simulations on an subsonic elliptical airfoil and i´ve noted that the only residual that is not reaching the desired tolerance is the continuity one, it never goes below 1e-3? can there be a reason for it, does it means that the simulation setup is wrong?

See below for guidelines on converging a solution:

http://cape-forum.com/index.php/topic,17.0.html

Jorg · August 29, 2012, 08:01

Ok; abut the mesh quality I am focusing on three indicators, this are element quality, aspect ratio and element skewness, besides my mesh is elliptical and structured, so ill try to check that continuiti solver.

August 28, 2012, 17:26	Hello- Why the continuity residual never decreases below 1e-3?	#1
Jorg New Member Jorge Join Date: Jul 2012 Posts: 16 Rep Power: 2	Hi, im performing a set of simulations on an subsonic elliptical airfoil and i´ve noted that the only residual that is not reaching the desired tolerance is the continuity one, it never goes below 1e-3? can there be a reason for it, does it means that the simulation setup is wrong?

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August 29, 2012, 04:21		#2
siara817 Senior Member siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 172 Rep Power: 5	I think it is nice to stop other solvers and let the continuity solver work lonely. Then see if it converges very well or not. If again it did not converge well, you need to check your mesh quality.

August 29, 2012, 08:01		#4
Jorg New Member Jorge Join Date: Jul 2012 Posts: 16 Rep Power: 2	Ok; abut the mesh quality I am focusing on three indicators, this are element quality, aspect ratio and element skewness, besides my mesh is elliptical and structured, so ill try to check that continuiti solver.