Learning Forum

[Moutaa]

Hello!!! Can you please help me!!!

Well, as you can see, i imported my external geometry and i generated my mesh.

But after updating the mesh, an error message had shown. Can you please help me and Thank you all.

[peteroznewman]

Hello Moutaa,

You need to spend some time preparing your geometry in a CAD system, or in DesignModeler or SpaceClaim before you start meshing.

What CAD system are you exporting geometry from?

What version of ANSYS are you using?

Which geometry editor do you know better: DesignModeler or SpaceClaim?

If you Attach a zip file with your external geometry to your post, I will take a look and advise on the cleanup required.

Regards,

Peter

[Moutaa]

Thank you Peter for replying, for your help that would be great and i attached a zip of  my external geometry ( all the components are in french) .

 

First of all, I am using Catia V5B19  ( in .stp format ) and  Ansys 17.1.

Well for the geometry editor I am sorry to say that i only know Catia.

Regards,

Moutaa

 

[peteroznewman]

Hi Moutaa,

I opened your STEP file in SpaceClaim.  The title of this mentions fluent, which is for simulating fluid flow. What I see in your file are the mechanical parts of some kind of column frame.

Please explain what you want to simulate with this frame and how Fluent might be involved.

Cheers,
Peter

[Moutaa]

Hello Peter

The mechanical parts are for a nanosatellite 3U. So what i wanted to simulate is

* Von Mises stress and the deformation of my body when we applie efforts to each direction (X,Y,Z).

* The heat exchange ( conduction and radiation).

Regards,

Moutaa

 

[peteroznewman]

Hello Moutaa,

I recommend you create midsurface geometry at the center of the thickness of each sheet body. So exclude the square blocks in the corners and the rivets fastening the sheets to each other.

You can either create this midsurface geometry in Catia if you can find that construction method, or you can do that in DesignModeler. Once you have these surfaces, the mesh will be much smaller and faster to solve.

You will use a Steady-State Thermal system (not Fluent) to calculate the conduction and radiation. You will drop a Static Static Structural system on the Model cell of the Thermal system to link the geometry and contacts, and in that second system calculate the von Mises stress and deformation. 

As an aside, is there a functional need for the holes in the center of the cross spans down the length of each side panel? If not, a better structural shape for maximum stiffness and minimum weight are triangular cutouts, not square cutouts.

You should edit the Title of this discussion and take out the word fluent. If you have more questions about building the model after the geometry meshes, post in the Structural Mechanics section.

Regards,

Peter

 

[Moutaa]

Hello Peter,

Thank you for your help i really appreciate that.

best regards,

Moutaa.