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Hexahedric on round profiles

  • Alessandro
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15 years 5 months ago #2535 by Alessandro
Replied by Alessandro on topic Re:Hexahedric on round profiles
The attach!
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15 years 5 months ago #2538 by Joël Cugnoni
Replied by Joël Cugnoni on topic Re:Hexahedric on round profiles
The hexahedral mesh generator of Salome NEEDs a specific type of geometry called "a BLOCK": a block is just like a deformed box, you need to have 6 faces and 4 edges per face.
In GEOM, you have the possibility to "Check Compound of Blocks" to see if the selected geometry can be meshed with the hexa algorithm.
This restriction usually means that you will probably need to partition your geometry to create "blocks" or even to reconstruct directy the geometry in a better way.


For extrusion / swept geometry, you can achieve good results with prismatic elements (which are usually better than tetra). To see how to use prismatic elements in Salome, you can have a look at the "extrusion meshing" tutorial :
www.caelinux.org/wiki/index.php/Doc:CAETutorials

Joël Cugnoni - a.k.a admin
www.caelinux.com
  • Alessandro
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15 years 5 months ago #2540 by Alessandro
Replied by Alessandro on topic Re:Hexahedric on round profiles
Administrator wrote:


For extrusion / swept geometry, you can achieve good results with prismatic elements (which are usually better than tetra). To see how to use prismatic elements in Salome, you can have a look at the "extrusion meshing" tutorial :
www.caelinux.org/wiki/index.php/Doc:CAETutorials


Thank you, this tutorial is very clear. I have to say that I didn't see it before!

Just another question: when working with assemblies, is it better to make a mesh for every single component and then make a compound of meshes to be given to code_aster? Or is it the same thing than to create a single mesh with 3d-groups (each one corresponding to a single component of the geometry assembly) in it?

The question is related to the fact to follow your tutorial to mesh an assembly: I think it is easier to make extrusion meshes on simple geometries then to make the same thing on a complex geometry obtained from an assembly of parts.

Thank you again for your patience... :-)
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15 years 3 months ago #2718 by Marcelo
Replied by Marcelo on topic Re:Hexahedric on round profiles
Hello Alessandro

What is this tutorial to mesh an assembly?
Could you tell me where I can get it?

Thanks
  • Alessandro
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15 years 3 months ago #2719 by Alessandro
Replied by Alessandro on topic Re:Hexahedric on round profiles
Marcelo wrote:

Hello Alessandro

What is this tutorial to mesh an assembly?
Could you tell me where I can get it?

Thanks


the tutorial show only how to mesh a single part, it is the number six in the wiki page:

www.caelinux.org/wiki/index.php/Doc:CAETutorials

If you have to mesh an assembly, I use this workflow, but may be another way exist (*)

1) Model the assembly in a cad package (Solid Edge, SolidWorks, Pro/Engineer, the one that you prefer).

2) Export it to step format

3) go to salome, switch to geometry module and import the step file.

you can look at my tutorial, the number eleven in the same wiki page. The analysis of an assembly is explained in it.

* = the other way exist, but it is very very very time-consumpting: you have to create 2d surfaces, create 2d meshes on these surfaces, and finally extrude them along a linear path or making a revolution around an axis, to create solids with the same shape of the original solids. If you create a group from every 2d surfaces to be extruded, the result of extrusion will be a 3d-group. You have to save the hdf file after every operation that you do, because in Salome the UNDO command DOES NOT exist!!!!!!<br /><br />Post edited by: Alessandro, at: 2009/03/20 16:20
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