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IGES file misses a lot of feature after import to SolidWorks

Question asked by Jafar Arash Mehr on Jun 27, 2019
Latest reply on Jun 28, 2019 by Jafar Arash Mehr

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Hello

I have a geometry in ANSYS Workbench. The geometry is shown perfectly without any gap or issue. Here it is:

I exported it in IGES format using Geometry-Design Modeler in Workbench:

But when I open it in SolidWorks this is what I see:

As you can see there are a lot of missing features in this. Here is my import setting in SolidWorkds:

Does anybody know what the problem is?

How can I have the same geometry (Exactly what I have in ANSYS workbench) in SolidWorks?

Thanks in advance for your help.

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STEP FILE.STEP.zip1.6 MB

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Glenn Schroeder Jun 27, 2019 11:46 AM
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I'm not familiar with the parent software, but can you save it as Parasolid instead of Step? I rarely deal with imported models, but it's my understanding that SW works much better with Parasolid models.
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- Jafar Arash Mehr @ Glenn Schroeder on Jun 27, 2019 12:01 PM
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  I tried what you suggested but the same problem still exists.
  The thing makes it even more weird is that when I open the IGES file made by ANSYS with ANSYS, the same issue happens! Here is a screenshot of ANSYS when opening the IGES file that I made using ANSYS:
  It is very different from the very first screenshot I have in this post! So weird!
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- Paul Salvador @ Glenn Schroeder on Jun 27, 2019 12:02 PM
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  ..adding... per the pdf I found, it looks like DesignModeler can export as Parasolid (this is the native and preferred format for SolidWorks).. the next is STEP and last is IGES.
  So, try Parasolid, then STEP with the import settings you show (to knit as Solid).
  The other option, change your import settings to NOT Knit... and see if you can Manually Patch and Knit after the import.
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Frederick Law Jun 27, 2019 12:05 PM
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Try use different option in import.
Like "Do not knit".

Also try other export format.
Last resort: STL.
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Alex Burnett Jun 27, 2019 12:31 PM
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Do you know if it is an export option within Design Modeler? I have ANSYS but our 3D editor is SpaceClaim within that rather than Design Modeler. If you attach your native 3D file, it may be possible for me to open it to see if I can modify/save it out for SW.
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- Jafar Arash Mehr @ Alex Burnett on Jun 27, 2019 12:40 PM
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  I uploaded the geometry you can open in ANSYS. Please let me know if you were able to export it correctly.
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  - Alex Burnett @ Jafar Arash Mehr on Jun 28, 2019 8:37 AM
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    I tried to open the file this morning and my computer took 15 minutes trying to load it and then locked up completely. Sorry, but I don't think I'll be able to help.
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    - Jafar Arash Mehr @ Alex Burnett on Jun 28, 2019 11:10 AM
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      Anyways thanks for the effort you put on this.
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      - Paul Salvador @ Jafar Arash Mehr on Jun 28, 2019 12:06 PM
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        Jafar Arash Mehr I'm curious now... if you don't mind,..could you attach the IGES (also the x_t or stp if possible)?
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        Jafar Arash Mehr @ Paul Salvador on Jun 28, 2019 12:21 PM
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        I attached the step file. The goal is to create a geometry in any CAD format similar to the very first screenshot I have in this post. I tried different ways but none of them worked yet.
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        Paul Salvador @ Jafar Arash Mehr on Jun 28, 2019 12:39 PM
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        ..well, it imports without any problems... here's the file/image..
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        STEP FILE z.zip2.4 MB
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        Jafar Arash Mehr @ Paul Salvador on Jun 28, 2019 12:47 PM
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        Of course it is imported well but the thing is I do not want all of these triangular surfaces. I mean I want only a few surfaces instead of thousands of small triangular surfaces.To do this, I imported the file into ANSYS and it creates a nice closed geometry by only a couple surfaces. But it can not import it correctly as an IGES or STEP file so I can open it in another CAD software like SOLIDWORKS.
        That is the problem.
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        Paul Salvador @ Jafar Arash Mehr on Jun 28, 2019 12:58 PM
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        ...ah,..so, you mentioned nothing about the triangles and now you don't want those triangles but something else, like the "nice closed geometry".. and that type of nice geometry is what in ANSYS? ....
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        Jafar Arash Mehr @ Paul Salvador on Jun 28, 2019 1:12 PM
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        ansys could detect the geometry automatically and save it in PMDB format. Then it could open it and export it in IGES or Parasolid or STEP format. The problem is the exported files can not be opened in SOLIDWORKS. If you have access to ANSYS I can share the geometry file.
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        Paul Salvador @ Jafar Arash Mehr on Jun 28, 2019 1:29 PM
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        my question is simple, what is the geometry in Ansys, is it also a triangular polymesh, SubD, Ngon, nurbs or something other surface definition or temporary graphical representation?
        Or, maybe the question should be, was all the geometry created natively in Ansys and if not, was it imported and manipulated and/or where/what is the original data?
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        Jafar Arash Mehr @ Paul Salvador on Jun 28, 2019 2:32 PM
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        Let me clarify it. I import the STEP file into ANSYS. Ansys automatically makes the uniform surfaces out of these triangular elements. I mean thousands of triangular elements reduces to for example 10 surfaces. I do not know how ANSYS could do it For example I can pick the internal surface by 1 click:
        Then the geometry could be saved in IGES or STEP formats. However it could not be opened by SOLIDWORKS.
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Jafar Arash Mehr Jun 27, 2019 12:34 PM
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Thanks for your replies. I tried what Paul and Fredrick suggested. Exporting as Parasolid or STEP did not work and ended up like the previous missing geometry. Same thing for changing the option to "Do not knit". I guess ANSYS may not be able to save the CAD files properly. That is why SOLIDWORKS can not open it correctly. The interesting thing is that even ANSYS can not open a file properly made by itself.
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IGES file misses a lot of feature after import to SolidWorks

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