Tetrahedral meshing algorithm failed
Tetrahedral meshing algorithm failed
(OP)
Hi
What on earth does this mean. The faces are all meshed (tet), then once abaqus contructs the tetrahedral elements it gives an error "tetrahedral meshing algorithm failed". Can someone please help. I have a very twisty object that needs meshing and nothing is working
Zhirayr
What on earth does this mean. The faces are all meshed (tet), then once abaqus contructs the tetrahedral elements it gives an error "tetrahedral meshing algorithm failed". Can someone please help. I have a very twisty object that needs meshing and nothing is working
Zhirayr





RE: Tetrahedral meshing algorithm failed
corus
RE: Tetrahedral meshing algorithm failed
RE: Tetrahedral meshing algorithm failed
I'd advise that you send the drawing back and ask them to draw it properly instead of leaving gaps everywhere. You could also partition the part into regions and then mesh each region separately. This will tell you where the problem lies. If you continually zoom into edges you'll probably find double lines or double points undicating that the part was drawn imprecisely. Try the Virtual gemoetry option in the mesh module to renove unwanted edges. This will make the mesh smooth over edges and make the geometry jagged with the deges of the elements. It's not a good result but if they couldn't be bothered to draw it properly in the first place what can they expect.
corus
RE: Tetrahedral meshing algorithm failed
Yours
Zhirayr
RE: Tetrahedral meshing algorithm failed
Now, back to CAE. An imprecise part may cause problem with certain boolean operations, typically when you are doing extensive partitioning for structured meshing. Tet meshing is **specifically designed** to handle tolerant (imprecise) parts.
Finally, CAE provides (in the Tools-Query menu) a whole bunch of geometry diagnostics tools. You should use these to interrogate the model to find: short edges, sliver faces, free edges, shell faces etc etc etc. If you are using 6.5-1 then you'll be able to do a whole lot more now to repair bad geometry: repair small edges to collapse tiny edges, also try the merge edges to join a whole bunch of edges into one. This last comman works really well even if you drag select the whole model... Nice if you've imported a CATIA model with the typical problem of having multiple edges along curved faces. Another great query tool is Mesh Gaps/Intersections. Once you have a boundary mesh you should run this check to see if there are any overlapping triangles. Rather than try and make the tet mesher do something with this bad boundary, you can go back and add seeds, use geometry repair, use virtual topology...