Crashing through mesh generation

[vahi...@gmail.com]

Hi folks,

I try to make meshes out of synthetic microstructures. I've tried all sorts of methods that I know to make exportable mesh file, but all of them crash. Can somebody help me?

I have attached the pipeline.

Best.

Vahid

[Michael Jackson]

Dear Vahid,

    Could you try the Abaqus Hexahedron exporter filter to see if you can get a file outputted from that?

 

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Michael Jackson | Owner, President

      BlueQuartz Software

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[vahi...@gmail.com]

Dear Michael,

thank you very much, I have just tried it and it works. But, some issues still there. The  outputted files cannot be red either with Gmsh or Paraview. My final goal is transferring the geometry, which consist of orientation into Comsol. So, I should convert the format of the output file to .mphtxt.  As far as I know It would be feasible if I could open it with Gmsh. Do you have any Idea?

[Saurabh Puri]

Hello Vahid,

Could you please post the exact pipeline that you used for Gmsh or Tetgen and is not working? Also, are the examples for Gmsh and Tetgen working on your machine?

Thanks,

Saurabh

[vahi...@gmail.com]

Hi Saurabh,

sure, I have attached it in my first email. I have disabled some of options to produce .msh file in the pipeline to show I have tried them but crashed as well. Unfortunately, I do not have the successful pipeline for generating .msh files.

[Saurabh Puri]

Vahid,

Please check the updated pipeline. I made minor changes to create a mesh using Gmsh.

Saurabh

[vahi...@gmail.com]

Dear Saurabh,

thank you very much, it can generate mesh file but still some questions:

- Is it possible to have control on the mesh type and size in Dream3D?

- Is the constructed synthetic structure, a blank material? In other words, can I assign material types and properties inside the FE software like Comsol ?

- My final goal is evaluating corrosion rate dependency on the grain orientation using Comsol, the list of possible input data for Comsol analysis are available in the following link:

https://uk.comsol.com/fileformats

However based on the link in below, ' STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes '

https://en.wikipedia.org/wiki/STL_(file_format)

Now this challenge comes to me, which format can transfer all attributes of geometry consist of the data regarding the orientation of grains and IPF colors? Is .bdf format sufficient?

Best.

Vahid

[Saurabh Puri]

Hello Vahid,

Please find answers to some of your questions.

Yes, there are some options to control the mesh on DREAM.3D. Please see the user interface for Gmsh, TetGen, and Netgen.

The mesh file obtained from DREAM3D's Gmsh interface (*.inp mesh for example) designates different grains as different element sets. It might help you in designating material properties in some simple cases.

If it is okay for you to use a mesh in which finite element discretization is equal to the discretization of the image, you can use Create Abaqus File. In this filter,  material information, including grain orientations, is written to the created *.inp file. Please check the documentation for details.

Regards,

Saurabh

[vahi...@gmail.com]

Hi Saurabh,

thank you very much for your answers. Honestly, the last part of your email made me more confused. I checked documentation and unfortunately could not find the answer. As last preparation step of the exportable file of the synthetic microstructure, I am using the following:

Quick Surface Mesh --> Export STL Files from Triangle Geometry --> Export 3d Solid Mesh

I have to generate the output with .msh extension for post-processing issues. Now, my question is:

If I change the extension of the .msh file to .bdf, then import the file into FEM software (in my case Comsol) and make solid from the mesh, finally, mesh the solid object again inside the software, do the grain orientations persist in the constructed solid?

Best.

Vahid

[cai cai]

Hello, Valid,
Sorry to disturb you. You question was very good. And it interested me a lot.
 I wanna ask you whether you had achieved your final goal about evaluating corrosion rate dependency on the grain orientation using Comsol by Dream.3d model?
Best regards,
Boyce Tsai