How to generate custom shaped uniform mesh

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  • Last Post 17 May 2019
shamik062 posted this 15 May 2019

Hello everyone

I want to generate a mesh (as attached in mesh.jpg file) on my model in symmetric manner. But unfortunately I can not get the desired shape of the mesh with the available shape control. Instead I am getting a mesh which is unsymmetrical as shown in the "Unsym_Mesh.jpg" file.

Is there any way by which I can generate a mesh like the one shown in mesh.jpg file?

A isometric image of the full model and the project file is also attached for reference

Thanks in advance.

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peteroznewman posted this 15 May 2019

Why spend so much time to get a perfectly symmetric mesh?

I recommend you spend your time getting a result from the initial mesh you have, remesh with elements that are smaller by a factor of 0.65 and get that result, then remesh with elements smaller by a factor of 0.65 again (0.42 of the original element size) and get that result.  Plot those three results (like max stress) on a graph vs. element size and see if the results are converging on a zero element size value.  This is called a mesh refinement study and is much more valuable than making a perfectly symmetric mesh.

shamik062 posted this 16 May 2019

Thank you for your reply and I totally agree with you. But my question was purely out of curiosity. I mean if I can manually do that symmetric meshing (in AutoCAD) why can't I do that in Ansys. Also you mentioned about the factor of 0.65. Is it arbitrary or is there any mathematics behind it? 

So, If I want to make my mesh like the one shown in symmetric one, how can I do that? Or is it at all possible by the controls available in Ansys.

Thanks again for your reply.

peteroznewman posted this 16 May 2019

The factor of 0.65 is not exact, its reciprocal is about 1.5 and a divisor between 1.2 and 2.0 is generally acceptable for the constant ratio of element sizes in a mesh refinement study.

Yes, it's possible to make a symmetric mesh if you slice the bodies up using planes into 4 quadrants and put the pieces in a multibody part to use Shared Topology, you can achieve symmetry.

sk_cheah posted this 17 May 2019

You could do mesh decomposition into quarters and specify hard line mesh sizing for each quarter of the circumference. Example here: Link

Kind regards,
Jason

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