Associate geometry /hard geometry

When I associate a curve with a surface, I would expect that for the meshing, the mesh would consider the complete line for the meshconnection. But it seems only the outer points are considered for the mesh, see attached picture.

I want to have a connection between 2 surfaces and this should be the way to do this?

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0 Darrel Sinclair over 6 years ago

Which mesher are you using? Paver should follow the mesh on the complete edge, but Hybrid will only consider the end points.
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0 ron.kunz over 6 years ago

Thanks Darrel,

That is indeed a solution for my current problem. However I was told hybrid mesher is more robust and for this situation I would prefer Hybrid mesh.

Is it possible that hybrid mesh also considers the complete line?
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0 Arthur Hickson over 6 years ago

Sorry I wrote this before seeing Darrels.

Yes, I would consider the mesh should follow the hard curve so if it does not then there must be some reason.

a) are you using the Paver mesher , the iso mesher can not handle internal hard geometry? I think you are but just checking.

b) does the "hard" curve truly lie on the surface. If the hard curve deviates by more than tolerance away from the associated surface then the surface mesh will pass underneath at that location. A "hard" curve can follow, lift off, follow etc and where it is within tolerance the surface mesh should follow and when it is outside tolerance it is ignored. does the surface need extending to meet the other one? Increase the global tolerance?

cheers

Arthur
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0 ron.kunz over 6 years ago

a.Isomesh is not possible because it is not biparametric (you only see part of the surface)

b. The line is created in Patran by project line on surface, so the hard surface should lie on the surface?

I projected a line, created a surface in between and afterwards combine two surfaces. But not the intersecting surfaces. But with Paver this is meshed like I want to have it.
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0 Darrel Sinclair over 6 years ago

The Hybrid mesher can be better than Paver in a lot of situations, but one limitation is that it only considers associated points.

A possible workaround could be to create points on the nodes, then associate the points. But this is messy and may not work as expected.

Another alternative might be to split the surface, then use mesh seeding on the new edge to enforce mesh continuity. Using the Tabular option for the mesh seed, you can select existing nodes and create a mesh seed that matches their positions:
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0 Darrel Sinclair over 6 years ago

Some extra info on Hybrid mesher attached.

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Meshing.pdf
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0 ron.kunz over 6 years ago

Thanks all for the information.
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0 ron.kunz over 6 years ago

Regarding this same topic, the markers for the hard geometry can be set to a bigger format? Just for my overview, would be handy, cause I have a lot of hard geometry.

Thanks.
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0 Darrel Sinclair over 6 years ago

You can change the size of the markers under Preferences/Graphics - move the Marker Size slider. Note that this seems to behave slightly inconsistently: markers on associated points change in size interactively, but markers on curves seem to only ever use the size that was set when they were created.
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0 Arthur Hickson over 6 years ago

Yes, I found switching between entity Coloring and Labeling = Entity type or Group did a redraw of them using the current set size.
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