Re: [deal.II] Strategy to snap the boundary of a triangulation to a manifold

2020-06-09 Thread heena patel
Dear Bruno,
   I am not expert, but OpenFoam has Snappyhex mesh
feature that might help you. Check the link below.
http://www.wolfdynamics.com/wiki/meshing_OF_SHM.pdf

Regards,
Heena

On Mon, Jun 8, 2020 at 6:22 PM Bruno Blais  wrote:

> Dear all,
> I hope you are doing well.
>
> In my endless quest for robust mesh generation of hex meshes using GMSH, I
> have managed to come up with a very robust strategy to generate hex-only
> meshes
> My only issue (which is a major one) is that this implies that my
> decomposition from tet to hex adds nodes that are not "snapped" to the
> boundary, but that are only linear interpolation of the other node on the
> triangular faces.
> Consequently, my quest remains unfulfilled.
>
> Meshing through high-order and snapping the additional node to a
> high-order mesh from within GMSH is very troublesome and not very robust
> (and also very time consuming). However, an idea came to mind.
> I was wondering if there could be an easy way to "snap" my faces to the
> manifold to which they belong.
>
> My problem is thus the following:
> - Given a triangulation and a manifold
> - Some nodes are exactly on the manifolds (the original nodes of the tets)
> and some are not (the added nodes in the subdivision)
> - What would be the best way to deform mesh so that the non-conforming
> node get deformed to the position which would be implied by the manifold? I
> think I could also make the process more robust by solving an additional
> elasticity equation during the deformation to deform the entire mesh
> instead of just the nodes close to the manifold.
>
>
> Would any of you have a suggestion on how best to achieve the deformation
> of the nodes to match the manifold?
>
>
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> .
>

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Re: [deal.II] Strategy to snap the boundary of a triangulation to a manifold

2020-06-08 Thread Wolfgang Bangerth

On 6/8/20 10:22 AM, Bruno Blais wrote:



Would any of you have a suggestion on how best to achieve the deformation of 
the nodes to match the manifold?


I suspect that this depends a lot on how exactly your manifold is given. You 
need some projection onto the manifold. If you used IGES CAD files, such 
projections are built-in with OpenCASCADE. For constructive solid geometry 
cases, it may be possible to build the project from known normal vectors. I 
expect that the situation becomes complicated in the "creases" where two 
boundary patches come together.


Best
 W.


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Wolfgang Bangerth  email: bange...@colostate.edu
   www: http://www.math.colostate.edu/~bangerth/

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