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February 26, 2013, 07:40 |
Is Bulid Topology necessary
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#1 |
Member
Sujay
Join Date: Apr 2010
Location: Karnataka, India
Posts: 41
Rep Power: 16 |
Dear All,
I am creating geometry from the vertices. The circles which are inlet and outlet get segmented when build topology is done. Is i necessary to carry build topology operation ? Thanks Sujay Patil |
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February 26, 2013, 07:48 |
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#2 |
Senior Member
AB
Join Date: Sep 2009
Location: France
Posts: 323
Rep Power: 21 |
Do you want to go for blocking or tetra mesh ?
For tetra mesh, it's highly recommanded, and even compulsory when you used the option patch dependent. By the way, I think you can play with the option of the bluid topology to avoid the curves to be splitted. |
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February 27, 2013, 00:52 |
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#3 | |
Member
Sujay
Join Date: Apr 2010
Location: Karnataka, India
Posts: 41
Rep Power: 16 |
Quote:
Thanks. Blocking is not used. Meshing Details : Shell Meshing: Patch dependent with Quad dominant Mesh Volume Meshing : Tetra/mixed with Robust(Octree) With use of build topology surface created from circle (which were created from three vertices and used as inlet and outlet) get segmented along circumference with addition of few more vertices on circumference after topology. That's why i want to avoid build topology. Will it OK Sujay Patil |
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February 28, 2013, 14:20 |
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#4 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
You should not be surface meshing and then running PI tetra, just skip the surface meshing and run PI tetra directly. It is a top down method that will generate the surface mesh for you.
Patch conforming methods require you to build topology and require you to set the sizes on the curves. These methods start from the curves and then generate the surface mesh and then you could fill with a delaunay or advancing front algorithm.
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February 28, 2013, 14:26 |
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#5 | |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Sorry, reading thru a private email on the side and I got a bit more info... here is the side email...
Quote:
Those defaults are in place to fill gaps if you don't provide enough info. For instance, if you asked it to compute a volume mesh using delaunay, it would first need a surface mesh, so it would check to see what settings you have there. In your case, you just need to go to Mesh => Compute Mesh => Volume mesh. Set the mesh type to "Tetra/Mixed" and the Mesh Method to "Robust (Octree)" and hit the compute button at the bottom. You may still get multiple edges, but those are expected if you have t connections in your model. Single edges may indicate a hole or they may simply be the edges of baffle surfaces. Delaunay violations are issues such as tight corners where delaunay may have trouble placing tetras, but they don't matter if you are using the Octree method.
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----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey |
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