want to create a volume tetra mesh with a inner surface trimesh as a constrain

Altair Forum User

I want to gnenerate volume tetrahedron mesh based on surface meshes. Let's say I creat a cube and a surface inside the cube, I first mesh the surface with tri mesh and then I want to mesh the whole volme base on the surface mesh I just create. Is there a way to do that in hypermesh. I tried to use 3D tetra volume mesh but it seems not wokring. Can someone give me some hints?

tinh

Hi Avirlcop

after meshing the surface, you mesh the outer of cube (tria elems)

and then enter 3D>>Tetramesh>>tetra mesh (not 'volume tetra')

change option to 'fixed trias/quads' and select all tria elems (on surfs and on cube)

then tetra elems will be mapped to the elems

Altair Forum User

Thanks for your help. But when I try to mesh it, it says the mesh is not enclosed. In my problem the inner surface is not intersect with the cube.

tinh

Hi

Try checking free edges on cube. If there is any free edge, tetra mesh cannot be performed

Altair Forum User

Hi,

what should work is this: First, tetramesh your volume without taking into account the tria mesh on the inner surface. Next, go to 'Tetra Remesh' select the tetraelements AND select the tria elements of the inner surface as '2D baffle elements' and remesh the volume.

Regards

Altair Forum User

Additional comment:

Having recent HM11.0 updates installed, this should work also directly with 'Tetra mesh'. If you select all tria elements (including the ones on your inner surface) the inner trai elements are automatically taken into account in your tetramesh. (I recall that this was not possible previously, so checking for updates and corresponding release notes may really solve the issue in this case)

Regards,

Altair Forum User

Same problem here. Additionally, after checking free edges with Tools>edges, it says that there are no free edges.. So what now?...

Altair Forum User

Sorry i have understood it wrong, So i have deleted the post

Altair Forum User

Can you please share the example model,,..  for our understanding,,.

Altair Forum User

hi,

I am having the same problem. as I am trying tetramesh, it says mesh is not enclosed.

What could be the possible solution? any help would be great as I am a beginner in hypermesh and I am trying to learn from online tutorials.

Thanks.

Altair Forum User

Hi 

I have volume with baffle inside, I am not able to get a proper boundary layer on the baffle , please see the figure

 

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Altair Forum User

mesh all surfaces then used cfd tetra mesh but boundary layer is not good on baffle, any tutorial or guidance shows how to use model baffles

 

Altair Forum User

Dear Raul 

attached the hypermesh file.

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