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Magr87 September 27, 2011 04:45

Ansa Modeling and EFD.lab
Hello together,

Actually i'm working with Ansa and EFD.lab and my Problem is that in Ansa i have a clean Model. But after the Output in Iges and opening with EFD it shows me about 600 faulty faces and 4820 gaps. What should i do?

vangelis September 27, 2011 07:20

Hi there,

One of the benefits of ANSA is its ability to handle non accurate geometry and apply topology based on specified tolerances.
This topology (connectivity information between Faces) however is not information that is stored in the IGES file.
As a result if you read the IGES file in another software you need to redo all the topology work again.
I am not familiar with the topology capabilities of EFD.lab but if it is not easy to fix the geometry there, I would recommend that you create a surface mesh in ANSA and the send it to EFD.lab.
I am sure EFD will be able to read mesh formats like NASTRAN or Fluent (or any other of the numerous formats that ANSA can output)

Hope this helps


Magr87 September 28, 2011 14:00

Hello, i try your proposition but have much more faulty faces. Can i clean my Model in EFD?

vangelis September 29, 2011 03:16


My proposition, was to generate a surface mesh in ANSA and export this surface mesh (tesselated representation of the geometry) in EFD.

Do not output the Geometry (IGES) but output the mesh (NASTRAN or FLUENT or any format that EFD would read).

Best regards,


Boris_M October 2, 2011 10:36

Hi Magr87 and Vangelis,

IGES is not the best format to transfer data. I don't know about the features of ANSA like Vangelis, maybe there is a way to reduce the tolerance. There are issues with too large tolerances in CAD systems that might cause problems using it in other systems. If the tolerace is too big and IGES then has gaps between these surfaces try to reduce the tolerance if that's possible.
For FloEFD or EFD.Lab as it was called some time ago it is useful to use STEP as solid models often get holes due to IGES export/import complex geometry is often not very good imported.
Also FloEFD works with a unique meshing technology that doesn't allow to use common meshes as the solver is specialized in its use and stability to this mesh. Just like other CFD software cannot handle FloEFD mesh.
There is a possibility to heal the imported geometry but with the amount of bad faces and gaps I can imagine this doesn't work very well as there are too many variables.

I hope this helps,

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