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Why Prism Layers appear on inlet, outlet and symmetry planes?

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Old   June 8, 2020, 13:20
Default Why Prism Layers appear on inlet, outlet and symmetry planes?
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Hi,

I have generated a mesh using Surface Remesher/Polyhedral/Prism Layer Mesher in STARCCM+. I have defined the correct boundary conditions for inlet, outlet and symmetry planes in the regions, but I see that prism layers appear on these boundary types rather than wall-type boundaries. Why is that happening?

After seeing this, I disabled the prism layer on inlet and outlet as for symmetry plane there is no any option to disable the prism layer, and then ran the surface remesher first and then volume mesher. But it didn't work.

Again, I deleted the Regions and assigned the parts to regions, specified the BCs and ran the mesher, still the problem exists.

Thanks for your time.
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Old   June 8, 2020, 16:15
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Are you using an automated mesh operation or a manual one in continua? The first doesn't recognize BC's because it's a predecessor in the pipeline.
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Old   June 8, 2020, 16:18
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Quote:
Originally Posted by LuckyTran View Post
Are you using an automated mesh operation or a manual one in continua? The first doesn't recognize BC's because it's a predecessor in the pipeline.
Yes. I am using automated one, since it is recommended by CCM+ so what's the solution?
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Old   June 9, 2020, 01:59
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Add custom controls and turn off prism layers on those surfaces. Do this in the automated mesher operation, not in region.
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Old   June 9, 2020, 05:15
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Quote:
Originally Posted by LuckyTran View Post
Add custom controls and turn off prism layers on those surfaces. Do this in the automated mesher operation, not in region.
Did that already. It doesn't work
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Old   June 9, 2020, 06:44
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I doubt it. Post a pic of your tree.


Any BC's you apply are irrelevant to the automated mesher operation pipeline because it is a predecessor. If you use a prism layer mesher and do not use any custom surface controls, it will put prism layers on every surface because that's the default parent behavior.
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Old   June 9, 2020, 08:27
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Dear Mazhar:

You need to manually disable prism cells on the boundaries that don't need them. Look for mesh setting under each boundary, and there you should be able to enable and disable prism cells for that boundary.

On mine (it's old) its under:

[Name of your region] > Boundaries > [Name of your Boundary] > Mesh conditions > Customize Prism Mesh

In the Properties window (usually below your tree) you can choose among using default values, using custom values, or disabling it.

Gerry.
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Old   June 9, 2020, 09:04
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Thanks for your kind inputs. I tried this all once it did not work so I deleted the regions and continua models. Assigned the parts to regions, specified boundary types, generated mesh, chose models and generated the mesh again now it works fine.
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