[Gmsh] separate boundary layer settings

Felix Salazar felix.salazar at polymtl.ca
Mon May 20 17:26:11 CEST 2019

Based on the .geo file, what you're seeing on the top and bottom surfaces
is due to the extrusions. The combination of these plus the BL fields
creates more layers than the 5 specified in the extrusions.

Try disabling (commenting) either the extrude or the BL field and remesh.

Around the cylinder, there's a BL. You have smaller quads there. If you
want finer control, try using an O-grid mesh
similar to the one on the previous link.

*Félix Salazar**felix.salazar at polymtl.ca <felix.salazar at polymtl.ca>*

On Sun, May 19, 2019 at 11:11 AM Ziad Boutanios <ziad at binkz.ca> wrote:

> Hi,
> The geometry I'm meshing is that of a cylinder in a straight rectangular
> channel in 2D. The geo file is attached, as well as a screenshot of the
> result. I would like to use separate settings for the boundary layer
> around the cylinder and at the top and bottom surfaces. To do this I
> implemented two BoundaryLayer Field sections (lines 40-48 and 53-61).
> Unfortunately only the boundary layer corresponding to the last section
> is produced. Can that be fixed using BoundaryLayer?
> Thanks,
> Ziad
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> gmsh at onelab.info
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