# Entries for March 2013

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## about polyDualMesh "Try something smaller than 90"

Posted March 28, 2013 at 02:06 by skeptik (CFD notes)

Quote:
Originally Posted by lillberg
Try something smaller than 90 deg feature angle since it represents the maximum angle between two neighboring surface normals on a surface without corners. That is, the mesh will consider your surface shape a corner if the angel is larger than this value. I typically use something between 45 and 80 depending on the tet mesh resolution on highly curved surfaces. This might be the root of your problem. Looking at my picture the curved surface in the middle would (wrongly) be treated as a corner if
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Posted March 26, 2013 at 05:39 by skeptik (CFD notes)

Quote:
Originally Posted by chegdan
Nick,

There are some strategies that I would try to get these residuals down to something you would like.
1. Lower your pressure relTol by an order of magnitude compared to U i.e. relTol = 0.001 for P and relTol = 0.01 for U.
2. Without knowing the mesh you are using you may need to increase the nonorthogonal corrector by 1 or 2. if you are using a tet mesh...then there are many things you can do.
3. Use first order schemes to start with (you will move to higher order ones
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## My cfd learning starts

Posted March 24, 2013 at 23:44 by vijaiaeroastro

Hello fellow cfd fans,
I am starting my deep cfd learning today. i found a material published on finite difference methods and i am going to start from a very simple fluid dynamic problem from today onwards. wish me luck!!
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## Forgotten post about airfoilmesh. Domain shape

Posted March 22, 2013 at 05:00 by skeptik (CFD notes)

First time i tried domain like this

And i got no good results cause pressure distribution shown problems with BC

I tried to make a circular domain like in this work shown in the next figure

and only with circular domain i get physically reasonable results.

other figures about mesh i used to

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## PISO's last results

Posted March 14, 2013 at 07:39 by skeptik (CFD notes)

SIMPLE showed better results.

May be it was caused by mesh. Tetra mesh with lower y+ shows similar results. Quad+tri 3D extruded mesh did not demonstrate good Cx, Cy.

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