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Old   February 14, 2015, 11:04
Default Improve Orthogonal Quality within Fluent
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Peter Storey
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I've done some shape optimisation (with adjoint solver) and the orthogonal quality has dropped from higher than 0.9 down to 0.5, and I'm beginning to see signs that the solution is struggling to converge.

What is the best way to refine/ improve orthogonal quality of the mesh?
So far I have tried Mesh > Smooth/Swap which has made it better, but I don't really know what I'm doing.

Thanks!
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Old   February 15, 2015, 12:16
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Tanmay Inamdar
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It will be better if you can do it in your mesher.Using a finer mesh helps.
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Old   February 16, 2015, 03:37
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Hi,

Read mesh in Fluent mesher. Use mesh/tool/auto-node-move command.
You can give a try with various dihedral angles.

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Originally Posted by ptstorey View Post
I've done some shape optimisation (with adjoint solver) and the orthogonal quality has dropped from higher than 0.9 down to 0.5, and I'm beginning to see signs that the solution is struggling to converge.

What is the best way to refine/ improve orthogonal quality of the mesh?
So far I have tried Mesh > Smooth/Swap which has made it better, but I don't really know what I'm doing.

Thanks!
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Old   February 16, 2015, 09:51
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Peter Storey
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Quote:
Originally Posted by Tanmay95 View Post
It will be better if you can do it in your mesher.Using a finer mesh helps.
My mesh is pretty fine already. My problem is that I can't take my .msh file back across to ICEM-CFD... unless you know a way of doing it?

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Originally Posted by maverick123 View Post
Hi,

Read mesh in Fluent mesher. Use mesh/tool/auto-node-move command.
You can give a try with various dihedral angles.
I haven't used Fluent mesher before, is it accessible from the Fluent main window?


Thanks for you replies
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Old   February 17, 2015, 03:22
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Hi,

While launching Fluent standalone (not through WB) you can find toggle to launch in Meshing Mode.
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Old   February 17, 2015, 07:25
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Peter Storey
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Ah I see. I'm currently working in 2D, and meshing mode isn't an option when selecting 2D. Is there a way around this?

Thanks
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Old   February 19, 2015, 06:00
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Hi,

You can not modify 2D mesh in fluent meshing.

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Originally Posted by ptstorey View Post
Ah I see. I'm currently working in 2D, and meshing mode isn't an option when selecting 2D. Is there a way around this?

Thanks
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Old   June 24, 2015, 08:54
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I think the ortho quality (>0.1) is ok for CFD and Adjoint. After some optimization loops not only the mesh changed but the flow situation, too. That (could be) the reason for convergence issues. The question is, how does the "solution is struggling to converge"? Does it diverge, oscillate, do you see some instabilities, slow convergence, ... ?
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