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[Ivosp]

So I'm trying to make a parametric study in fluent. The model is a box (white in pic) inside a flow field. Another box (turquoise in pic) presents the flow field itself, but it's much bigger than the solid box inside. Also, I created a Body Of Influence (yellow in pic) around the solid box. Its shape is a sphere. For a better understanding, see the picture below. I already got the simulation up and running.

Now I would like to do a parametric study. The goal is to analyze the flow around the solid box from different directions. It's my first time doing (or trying to do) a parametric study. From what I read online, I thought that the first thing I needed to do was create the parameters I wanted to change. My idea is, that the boundaries stay the same (so the input/output of the big flow field) and I rotate the Body of Influence with its dead area (so the solid box) in two directions. So I created 2 driving dimensions (angles), one between the y-axis and x-axis and one between the y-axis and the z-axis. I haven't changed the angles so far (so they are still 0° as in the original simulation). 

After creating those driving dimensions, I had to update the rest of the simulation. But I got an error:

Error: 4097 self-interesecting triangles exist in the model, which is above the limit for automatic smoothing ( 10 ). Either CAD plug-ins (instead of CAD readers) were used, which sometimes lead to a Multi-body-part topology, or Share Topology in SCDM/DM failed at certain locations. In the later case, make sure to invoke Forced Share option in SCDM.

 

Error: state/object/execute-command:Eception encountered in S_ExecuteUpstreamNonExecuteAndThisTask: 4097 self-intersecting triangles exist in the model, which is above the limit for automatic smoothing ( 10 ). Either CAD plug-ins (instead of CAD readers) were used, which sometimes lead to a Multi-body-part topology, or Share Topology in SCDM/DM failed at certain locations. In the later case, make sure to invoke Forced Share option in SCDM.

Error Object: ()

 

I don't get the error. How can there be self-intersecting triangles, if I rotate a sphere inside a fluid? And how do I fix it? If you need any further information, please ask. I'm still a beginner and I am kind of lost ..

[Keyur Kanade]

I assume you are using SpaceClaim and Fluent Meshing. This error comes in when there is intersection in geometry. Please cross verify after creating dimension. Change angles and use interference tool in SpaceClaim. 

Please go through help manual for more details 

Regards,

Keyur

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[Ivosp]

But why should a self-intersection occur if I have changed the geometry absolutely nothing? I have only added 2 angles in SpaceClaim, but have not changed them. The sphere is still 100% in the same position, so the angles are both 0°. So how can this error occur without changing the geometry, just by naming two angles? 

 

But apart from that, in the parameter study, which I have not yet carried out, these 2 angles are supposed to change (i.e. the sphere is supposed to rotate). How is this possible without the error of self-intersection?

[Keyur Kanade]

Have you used enclosure? Have you subtracted one body from another? 

Can you please use Workbench → Share option and then check. 

Please go through help manual for more details 

Regards,

Keyur

How to access Ansys Online Help Document

Guidelines on the Student Community

Fluids Engineering Courses | Ansys Innovation Courses