Meshing Errors from Micro-CT Geometry

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  • Last Post 08 August 2018
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aCVP posted this 07 August 2018

Hi all,

I'm new to ANSYS. I have been creating complex geometries from micro-CT data with the hopes of successful meshing and eventual flow analysis in Fluent. However, I've been encountering the following error upon meshing:

"The mesh did not complete due to poor quality elements or incorrect input. Please try meshing with another mesh method or different mesh options."

A few questions based on this error:

  • What are the ideal inputs for complex geometries?
  • How do you know if a geometry is "too complex" before going through the meshing process?
  • Are there any tips/tricks for meshing micro-CT generated geometries?

Thank you!

 

 

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SandeepMedikonda posted this 07 August 2018

Hello, 

Please see if this post and this prior discussion help?

Also, here is some discussion from the manual on how to handle complex geometries.

Regards,

Sandeep

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aCVP posted this 07 August 2018

Thank you so much!

peteroznewman posted this 07 August 2018

Hello aginn,

I have had some experience trying to mesh solid models that was generated by software that segmented a surface from a 3D CT Scan and it can be very challenging.  This is primarily because the surface may be composed of a very large number of very small facets. 

There are tools that can be used to "shrink wrap" a new surface over the top of a region of facets, and some of those tools are in SpaceClaim, however, the Reverse Engineering tools are a separate license that is not included in the Student license.  There is however a merge faces tool, but that is much more labor intensive.  Take a look at this discussion.

If you want to share your geometry, I can take a look and offer some other ideas. Create a Workbench Project Archive .wbpz file and attach it after you post your reply. The file has to be < 120 MB to attach.  Try Clearing Generated Data on the mesh to make the file smaller.  Reply with a Google Drive link if you can't get the file size small enough.

Regards,

Peter

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rwoolhou posted this 08 August 2018

You might be better using the Wrapper in Fluent Meshing: it's similar technology to SpaceClaim but doesn't need extra licences (it's also a lot more powerful but less easy to use). However, meshing a micro-CT model within the 512k cells will be a challenge. 

Which segmentation software are you using? The ones I've dealt with (Materialise & Simpleware products)  have pretty good clean up tools, and the cleaner the geometry is the easier the meshing stage will be. 

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aCVP posted this 08 August 2018

I was actually able to get it to work by cleaning up my geometry some more and using the "shrink wrap" option. I also used a tetrahedral mesh. 

Thank you for your help!

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