[airwarriorg91]

Hello !
I am trying to study the flow around a complex geometry in NEK5000, where I require to have structured mesh with quad/tetrahedral elements in a GMSH mesh for importing it in GMSH.

I have created the geometry from scupling in blender and trying to import in GMSH but I can't use it for creating the mesh. What would be recommended workflow for this to create a complex geometry in blender and then mesh it GMSH.

Thanks,
Gaurav

[Martin_Sz]

While NEK5000 can handle structured meshes with quad/hexahedral elements, creating such meshes directly from complex geometries in Blender is not recommended. Here's a more suitable workflow for your situation:
* Model Creation in Blender:
* Use Blender to create a high-fidelity representation of your complex geometry.
* Focus on accurately capturing the overall shape and details crucial for your flow analysis.
* Export to STL/OBJ:
* Once satisfied with the model, export it from Blender in a format compatible with GMSH, such as STL or OBJ. These formats efficiently represent the surface geometry.
* Meshing in GMSH:
* Import the exported STL/OBJ file into GMSH.
* GMSH excels at meshing complex geometries. Use its tools to create a structured mesh with quad/tetrahedral elements suitable for NEK5000.
* Pay attention to element quality during mesh generation.
Alternative Workflow (advanced):
If you're proficient with mesh generation in Blender, you can attempt to create a preliminary structured mesh within Blender using its native capabilities. However, this approach can be challenging for intricate geometries. Ensure the exported mesh from Blender adheres to NEK5000's element specifications.
Key Points:
* Blender is well-suited for sculpting complex shapes, while GMSH is powerful for mesh generation, especially for structured meshes.
* Leverage the strengths of each tool for optimal results.
* Consider consulting NEK5000's documentation for specific requirements regarding mesh quality and element types.

[airwarriorg91]

Thanks for the tip ! I found out about salome and uses gmsh for meshing. So, it will do the job.

[wearpanel]

In GMSH, define physical groups for different parts of the geometry if needed. This helps in identifying different regions during the meshing process.

[michealkors]

Hey Gaurav,

Blender excels at sculpting complex shapes, but GMSH works best with structured meshes. For NEK5000, you might want to try exporting a simpler, watertight STL from Blender and then defining the mesh within GMSH itself. There are tools for creating quads and controlling element size.

[airwarriorg91]

Originally Posted by michealkors

Hey Gaurav,

Blender excels at sculpting complex shapes, but GMSH works best with structured meshes. For NEK5000, you might want to try exporting a simpler, watertight STL from Blender and then defining the mesh within GMSH itself. There are tools for creating quads and controlling element size.

The mesh I export from blender is watertight but cannot create a mesh there. The boolean operations are not working.