[ANSYS Meshing] Help with Structured Hexahedral Mesh in ANSYS Meshing for Open Ring GeometryAnsys, Me

PEGM10_ · November 9, 2024, 06:22

Hello everyone,

I am working in ANSYS Meshing and need to generate a structured hexahedral mesh for a 3D model shaped like an open ring, as shown in the attached image. The geometry resembles a "C" in cross-section.

My goal is to achieve a fully structured hexahedral mesh, but I'm having difficulty due to the open shape of the solid. I have tried splitting the geometry and applying mesh controls, but I haven't been able to get the structured mesh I need.

I have attached the .wbpj file from ANSYS Workbench along with the geometry so you can see the specific details of the model and the mesh settings I've tried. Could anyone offer suggestions on how to split the domain or configure mesh controls in ANSYS Meshing to obtain a structured mesh for this open ring shape? Any step-by-step guidance or specific advice for this type of geometry would be greatly appreciated.

Thank you in advance for your help.

Gert-Jan · November 12, 2024, 06:19

At one end, I see a very narrow passage. How does it end? Does it end with an angle (close to 0°) or with a rectangular surface?

In other words: do you have 6 surfaces with 4 corners each?
Or do you have 5 surfaces, from which 2 are triangular with only 3 corners?

PEGM10_ · November 18, 2024, 08:21

Quote:

Originally Posted by Gert-Jan

At one end, I see a very narrow passage. How does it end? Does it end with an angle (close to 0°) or with a rectangular surface?

In other words: do you have 6 surfaces with 4 corners each?
Or do you have 5 surfaces, from which 2 are triangular with only 3 corners?

The visible end of the object finishes with an angle close to 0°, resulting in a design with 5 surfaces in total, two of which are triangular (with three vertices each). Therefore, it does not have a rectangular flat surface at that end, but rather the surfaces converge into an angular shape.

Gert-Jan · November 18, 2024, 09:05

Then you ask for something impossible. A fully structured hexahedral mesh requires a cubic topology, i.e. a volume with 8 corners and 6 rectangular surfaces. That is not what you have.

There are 3 options:
1. A way out is to split the geometry such that you end up with smaller volume that each has a cubic topology. This is possible, but the end result will be very bad mesh. That route is an dead end, is my experience.
2. Make a fully unstructed mesh. This technology is invented for a geometry like yours.
3. Make a mix. You can split the geometry and make a structured mesh on the large side, and an unstructured mesh on the thin side.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[ANSYS Meshing] Generate hex mesh for CHT in Ansys Meshing	PierreLCV	ANSYS Meshing & Geometry	0	March 1, 2024 11:17
[blockMesh] Meshing a thin annulus ring within a larger mesh	Prop	OpenFOAM Meshing & Mesh Conversion	0	October 28, 2020 15:49
Ansys SIG$ILL error	loth	ANSYS	3	December 24, 2015 06:31
[mesh manipulation] Importing Multiple Meshes	thomasnwalshiii	OpenFOAM Meshing & Mesh Conversion	18	December 19, 2015 19:57
[ICEM] Problem making structured mesh on a surface	froztbear	ANSYS Meshing & Geometry	4	November 10, 2011 09:52

November 12, 2024, 06:19		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	At one end, I see a very narrow passage. How does it end? Does it end with an angle (close to 0°) or with a rectangular surface? In other words: do you have 6 surfaces with 4 corners each? Or do you have 5 surfaces, from which 2 are triangular with only 3 corners?

November 18, 2024, 09:05		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	Then you ask for something impossible. A fully structured hexahedral mesh requires a cubic topology, i.e. a volume with 8 corners and 6 rectangular surfaces. That is not what you have. There are 3 options: 1. A way out is to split the geometry such that you end up with smaller volume that each has a cubic topology. This is possible, but the end result will be very bad mesh. That route is an dead end, is my experience. 2. Make a fully unstructed mesh. This technology is invented for a geometry like yours. 3. Make a mix. You can split the geometry and make a structured mesh on the large side, and an unstructured mesh on the thin side.