3D model - Hypermesh - FEKO

Dimon

Hello Professionals,

 

I want to make an electromagneic simulation number of cars. But, almost 1 month, I am trying to prepare my mesh model in Hypermesh for the purpose. I have tested a lot of 3D models, but problems such as small face, violation of a segmentation rule, faces have no common edge, overlapping/intersected faces etc appear again and again. I am not the high pro in car design and do not want to create my cars. Additionally, I need to consider physical property of materials in cars.  That's why I am wiriting here and ask you to answer my questions please:

1. What kind of model do I need? Based on my month experience files such as *.STL, for instance, do not suit, however, PTC/SOliDWOrks native file, or STP/IGES work fine. Am I right?

2. Can Hypermesh remesh STL files: delete own grid and create a new one? Can I assign different materials for each face in Hypermesh? Where can I found tutorials on that? Note, I really want to learn how to prepare good mesh-grid for the FEKO from stl models, since the models are most populatr in internet.

3. Is there literature on Hypermesh? I wanna do my own meshgrid for the FEKO and validate it correctly.

4. What online resource with 3D cad models you may suggest for the followgin algorithm: 3D model -> Hypermesh-> FEKO. 

 

Thank you.

BR, Dimon

Johan_Huysamen

Dear Dimon

 

To answer your questions as listed above:

1. Yes, STL files have geometry represented as triangular surfaces and this would not be efficient. Ideally you want smooth CAD surfaces that would mesh efficiently.
2. I'm not an expert on HyperMesh and would suggest that you submit the question on remeshing STL on the HyperMesh forum. While it is possible to assign materials to faces (or mesh elements) in HyperMesh, please note that the supported mesh formats for import in FEKO do not support the transfer of these settings. The material settings would have to be defined and assigned in FEKO. Please note that CAD models freely available on the internet are usually intended only for 3D visualization (rendering) purpose and are regularly not well suited to the EM modeling process. Such models would very likely have overlapping/intersecting surfaces and small faces.
3. Again, this information might be more easily obtained through the HyperMesh forum.
4. As mentioned above, online CAD model resources are not intended for EM modeling and therefore usually require a lot of work to get them in a state that would be valid as an input to the FEKO Solver.

Kind regards,

Johan H

Dimon

Altair Forum User said:

Dear Dimon

 

To answer your questions as listed above:

1. Yes, STL files have geometry represented as triangular surfaces and this would not be efficient. Ideally you want smooth CAD surfaces that would mesh efficiently.
2. I'm not an expert on HyperMesh and would suggest that you submit the question on remeshing STL on the HyperMesh forum. While it is possible to assign materials to faces (or mesh elements) in HyperMesh, please note that the supported mesh formats for import in FEKO do not support the transfer of these settings. The material settings would have to be defined and assigned in FEKO. Please note that CAD models freely available on the internet are usually intended only for 3D visualization (rendering) purpose and are regularly not well suited to the EM modeling process. Such models would very likely have overlapping/intersecting surfaces and small faces.
3. Again, this information might be more easily obtained through the HyperMesh forum.
4. As mentioned above, online CAD model resources are not intended for EM modeling and therefore usually require a lot of work to get them in a state that would be valid as an input to the FEKO Solver.

Kind regards,

Johan H

 

Dear Johan,

 

Thank you for the information. As I understand there only are 2 ways to proceed:

i) to design my own stp/igs (PTC, Solidworks) model from the scratch (preferable) 

ii) to find a specific CAD model with correct geometry.

 

Am I right?

 

BR, Dimon