Error in meshing

  • Last Post 28 February 2019
  • Topic Is Solved
sam_5195 posted this 20 February 2019

I am doing a flow analysis of solar panels and their supporting structure. It involves parts of supporting structure which are as small as 8e-04 thickness and the whole enclosure is of about 70m x70mx 10m. The problem is when i try to mesh them using edge sizing for very large edges(~10m) and very small ones with appropriate element sizes it consistently throws up three errors: 

message 1:
Ansys mesh the surface mesh is intersecting or close to intersecting making it difficult to create a volume mesh please adjust the mesh size or adjust the geometry to fix the problem.
message 2:
A mesh could not be generated using the current meshing options and settings

message 3:

The mesh generation did not complete due to poor quality elements or incorrect input.

I tried pinching, virtual topology as well as keeping the element size and max face size very low(which sometimes freezes the computer) to no avail. I am wondering whether i could remove the small edges but the thing is i intend to perform stress analysis using the flow data which probably could affect the results  Any suggestions would be appreciated. Thanks.


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rwoolhou posted this 21 February 2019

You're losing the small edges in the tolerance. In Fluent we use a thin wall which has no thickness or you can also remove small features. If you do need those features you need to reduce the cell sizes to fully capture them: in a domain that size you're going to get a VERY big mesh. 

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sam_5195 posted this 28 February 2019

Thank you very much. Just to clarify do you mean there is no way around it except maybe removing all the small thicknesses in spaceclaim?

rwoolhou posted this 28 February 2019

No, you can also resolve the mesh at that level: ie your cells will need to be 0.2mm.  You don't have enough compute for that so I'd advise removing/simplifying the geometry. 

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sam_5195 posted this 28 February 2019

Thanks a lot for your answers.