DesignModeler loses surfaces / volume when importing CAD files

  • Last Post 23 March 2020
Lacy posted this 20 March 2020

Hello everybody,
I have the problem that when importing CAD files into the DesignModeler certain surfaces or even whole volumes of the body are lost.

The CAD file is a model of a F1 front wing attached to a F1 car. The file was created using SolidWorks where everything is still fine and all surfaces were filled. In total I have created about a dozen front wings from different years, but the problem occurs in a similar way with 3 different pieces.

In the beginning I had exported all files as STEP, but since the problems came up I also exported them as IGES and X_T. The same error always occurs at different places. As you can see in the pictures a piece of the front wing is always missing, be it a surface or a whole volume. The pictures are only for clarification and are a little bit different depending on the CAD file.

Unfortunately I don't know what to do to prevent this, attempts to use additional surfaces, radii or chamfers were not successful.

CAD: SolidWorks 2019/20 Student Edition

Screenshot of the CAD - ISO 1

Screenshot of the CAD - ISO 2

Screenshot of the CAD - Front View

Screenshot of the CAD - Brid View

Export: STEP; IGES; X_T
CFD: ANSYS 2019R2 (Student Edition)

Screenshot of the DesignModeler - STEP

Screenshot of the DesignModeler - IGES

Screenshot of the DesignModeler - X_T


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rwoolhou posted this 20 March 2020

Staff are not permitted to open/download attachments or (generally) follow links. 

My guess is either you have too many surfaces (Student is limited to about 300, I think) or some of the faces/volumes are corrupt in some way. 

Lacy posted this 20 March 2020

Thank you @rwoolhou
I have also access to a non student version of Ansys with the same problem.




kkanade posted this 23 March 2020

With non student version please try to use reader mode to import geometry. 

if the geometry has many curved surfaces, suggest you to split those surfaces in solidworks.

try to use symmetry to reduce problem size. 

use iges format which may give good result for surfaces. 




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