Problem extruding Boundary Mesh
 

Hello,

I don't know if there is something wrong with my geometry or if this is a bug in engrid, but I have been trying to create a mesh around a simple strut, and when I extrude the boundary layer some points do not get extruded and/or the boundary layer mesh shows "holes" in it. I think that this is causing NETGEN to crash if I try to continue with the process. Has anybody else experienced this problem? Is there an easy solution?

Thank you,

Francisco

Greetings Francisco,

Can you share any images of the problematic locations? Because from the description you've given, I'm not managing to picture it in my mind :(

Best regards,
Bruno

These are a few pictures of the BL mesh and the surface below it. Thanks

Hi Francisco,

The fourth image is showing some reasons of concern about the surface mesh. The triangles on the right are very thin and that darker part of the mesh, where it seems to sink into the volume, is a very big reason of concern.

A few questions:

1. Is that darker region implying that there are some surfaces that are not being meshed?
2. Are you keeping each curved and flat surfaces on their own boundary code, or are you leaving them together in a single item?
3. When the boundary layer finished, does it give any warning or error messages?

Best regards,
Bruno

Hi Bruno,

The darker region is the part in which the BL mesh is not being extruded properly. It shows as a "hole" and that is why it looks darker. Right now, every surface on the strut has their own boundary code, with the leading edge separated into another so that it can be assigned a finer mesh. I have found that this also prevents the smoother to do funny things because of the change in curvature. No error messages appeared. I was having problems with overlapping faces, but those are solved now.

Thanks,

Francisco

Hi Francisco,

On that problem location, what does the original geometry look like?

Best regards,
Bruno

Hi,

This is how the blender import looks like. It is like this for the whole leading edge.

Thanks for the help,

Francisco

Hi Francisco,

Are you sure that is the right image/location? I was asking about the original geometry on the location for the 4th image, namely this one:
http://www.cfd-online.com/Forums/att...ary-mesh-4.jpg

If it is the correct location, do you have at least 3 boundary codes for describing this region? On on the top, another on the bottom and another for the curved edge.

Best regards,
Bruno

EnGrid crashes when creating boundary layer
 

[post deleted]

Hi Richard,
Prism layers generated without any problem. See the file showing the boundary layer mesh over the sphere.