Learning Forum

[paulburbulea]

Hello,

 

I'm having trouble meshing a large rocket body for a fluid-structure interaction. The body has a lot of faces, around 8000 to be exact, and is a file I imported from solid works. Whenever I try to mesh it always fails, usually siting that around 1500 faces failed to mesh. Also whenever I do a fluid structure interaction without the mesh manually defined it usually freezes and I have to control-alt-delete in order to close Ansys. It does this for whatever mesh resolution I try. I have tried varying the settings, global sizing and additional settings, however I'm not sure what to do in order to get this to work. I was wondering if anyone knew of any settings in Aim that might be able to mesh this object and get it to run.

Attached are pictures of the situation.

Thanks.

[Naresh Patre]

Hello PaulB

Looking at the images, it appears that the rocket model is made up of triangular shaped faces. Such geometries generally come when exported as stl format. Such triangular shaped faces are difficult to mesh as it is. I would like to know if you exported the geometry in stl format from Solid Works? If yes, then I would recommend you to export the model in other format like stp, parasolid so that the geometry is represented by standard shapes like cylinder, rectangle, etc which is much easier to mesh in ANSYS AIM.

In case the model exported in other format is also showing same triangular faces, then you will have to clean the model so the geometry is represented by standard geometry shapes. This cleanup can be done in SpaceClaim session of AIM or also in standalone SpaceClaim session. Please refer a couple of videos listed below which demonstrates some approaches on how to create a solid from stl (triangular faces).

Create lever geometry from STL in SpaceClaim

Solid model creation from STL in SpaceClaim

One more option to try out within AIM is to use Volume creation option after the geometry is imported. Please check out below video for details about volume creation approach. Also visit the online help document for detailed information in this context.

[paulburbulea]

Hey, the first option you mentioned worked! I exported the solid works file a a parasolid instead of an stl and there was no face or meshing issues, thanks.