Step-54 Initial mesh

[Tim Braun]

Hello,

Forgive me if I missed something obvious.I'm having trouble understanding the function of the initial mesh file and how to create one that is suitable for a custom NURBS geometry. It looks like the mesh file in the Step-54 tutorial contains two facets that are very small compared to the iges geometry and the latter is also translated a few meters away from the origin (perhaps the original geometry had the stern of the ship at 0).

So could one just use the same initial mesh file for all other surfaces? Or what information is extracted from this file and used in subsequent triangulation steps?

Best regards to everyone,

Tim

[Timothy Braun]

It's now too late to edit my question, but I already realized that the size and location difference between the geometry and mesh is because I didn't scale the geometry by 0.001 as is done in the tutorial. And I know you can generate an initial mesh from gmsh or another tool.

My final questions are still open regarding the what to consider in order to generate a "good" initial mesh element file.

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[Wolfgang Bangerth]

Tim:
I'm not sure I understand your question, but in short: A mesh is a good
initial mesh for a curved geometry if it adequately resolves the curvature of
the surface you want to mesh. For example, if the surface oscillates with a
vertical deformation like
sin(2*pi*x/lambda)
then you can't expect that a mesh with mesh size h=lambda is good because it
does not approximate the surface at all. You will need h=lambda/4 or smaller.

Best
W.

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