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Simulation Mechanical and Multiphysics


Surface Mesh Problem

103 Views, 7 Replies
06/13/2017 6:29 AM

Why my surface meshes are different for both slices when the design is the same??

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Message 1 of 7 ( Views: 103 )

Re: Surface Mesh Problem

06/13/2017 7:03 AM

with attach of autocad drawing

ATTACHMENTS:
Single Square2.dwg

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Message 2 of 7 ( Views: 93 )

Re: Surface Mesh Problem

06/13/2017 3:58 PM

Hi @civilzai94

 

I am not seeing the same behavior. When I mesh the model, the mesh size on the two brick blocks are the same size.

 

  1. Did you change the mesh size for one of the parts? Try changing these two settings:
    1. "Mesh > Mesh > All Parts Use Model Settings"
    2. "Mesh > Mesh > 3D Mesh Settings > Options > Model" and uncheck "Use automatic geometry-based mesh size function"
  2. Also, why are your colors different? It looks like your parts are 4 and 5, but the DWG file only has 3 parts?
  3. Also, the two blocks do not have a groove for the "o-ring" (part 1 in the model I imported). So the volume of the o-ring overlaps or interferes with the volume of the two blocks. Is that what you want?

 



John Holtz, P.E.
Technical Support Specialist
Customer Service & Support
Autodesk, Inc.


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Message 3 of 7 ( Views: 78 )

Re: Surface Mesh Problem

06/14/2017 9:03 AM

The autocad drawing of mine should be the symmetrical to each other. I have no idea why the colour are different when both are the same. The cylindrical shape in the middle is the reinforcement bar of the block systems.

 

1) This isn't works for me

2) Is there necessary to make the grooves for the O-ring ? Can i see how can that works?

 

Can i know what is my meshing problem or is there any mistake i did during the exportation of my autocad file into Simulation Mechanical

By the way, i am uploading the autocad file using .iges format. 

 

Please correct me if i have did something wrong during the process. Thank you


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Message 4 of 7 ( Views: 68 )

Re: Surface Mesh Problem

06/14/2017 12:49 PM

Hi @civilzai94

 

If I understand correctly, you opened an IGES file with Simulation Mechanical, not the DWG file that you provided. That may explain some of the differences between my model and your model.

 

To understand what happened when you meshed the model, why the two parts mesh differently, and so on, we need to have your Simulation Mechanical file. Please create an archive ("app button > Archive > Create") and attach the file (.ACH) to your reply.

 

If you want the rebar to interact with or be connected to the blocks, then the blocks need to have a groove to hold the rebars. Without the groove that match the rebars, the rebars will not be connected to the blocks. Also, you would have block material and rebar material occupying the same volume, and that is not realistic.



John Holtz, P.E.
Technical Support Specialist
Customer Service & Support
Autodesk, Inc.


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Message 5 of 7 ( Views: 62 )

Re: Surface Mesh Problem

06/14/2017 2:26 PM

@john.holtz

 

I have attached the .ACH file, is it better if we upload the file through .dwg , but sometime the blocks and the reinforcement bar inside will be split when i input using autocad file, this is the reason why i uploaded using .iges file.

 

About the groove and the reinforcement bar, can i know how to draw the groove between the reinforcement bar and the blocks so they are link together in the simulation mechanical after i uploaded it? Can you show me in the autocad drawing i provided?Much appreciated 

 

Thanks

 

 

ATTACHMENTS:
Single Square5.ach

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Message 6 of 7 ( Views: 60 )

Re: Surface Mesh Problem

06/14/2017 3:27 PM

Hi @civilzai94

 

You may have noticed that part 1 does "retry 2 of 6" when meshing. That indicates that part 1 has a problem with the current mesh size and needs to reduce the mesh size to create a valid volume.

 

I do not know exactly why this is happening in the model, but it has something to do with the rebar. It is probably a "random accident" that the rebar is affecting part 1 and not part 2. Once you fix the model by adding the groove, the model should mesh better.

 

I do not know how to use AutoCAD. Generally, 3D modelers have a way to subtract one part from another. So you want one copy of the rebars to subtract from part 1, another copy of the rebars to subtract from part 2, and a third copy of the rebar to fill the groove. I am sure there are other ways, too, such as extruding a circle to cut the groove into the blocks.

 

If you need some help with AutoCAD, feel free to post a question to the AutoCAD forum: https://forums.autodesk.com/t5/autocad-forum/bd-p/706

 

 



John Holtz, P.E.
Technical Support Specialist
Customer Service & Support
Autodesk, Inc.


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