[wwrfd]

Hi everyone,

I'm supposed to make a study on cylindrical shapes using Salome openFOAM coupling.
Problem is I want to make a structured mesh with boundary layers on it. I saw some threads talking about that, but there weren't making any reference to my problem. I understood the process to refine the mesh near the BC walls (I attached some pictures) but my geometry is made of several cylinders crossing each others and I had to use the boolean operation "fuse" to have only one solid that make the fluid volume.

At the intersections of the cylinders, the algorithm of quadrangle mapping doesn't work because I don't have 4 edges (which is logical unfortunatly...) so I wondered if there were a way to project the faces or to do a sketch on the main cylinder (the horizontal one) of the others cylinders to have 4 edges per face instead of using the boolean operation fuse that creates meshing problem (for structured mesh).
I hope I explained it the right way so everybody can understand the problem.

I attached some pictures of my geometry and a structured mesh with a "pseudo" boundary layer I managed to create on a simple cylinder.

Thank you for your replies.

Structuredmesh.jpg

solidbeforeBO.jpg

solideafterBO.jpg

shapeview.jpg

[vasanthkch]

Originally Posted by wwrfd

Hi everyone,

I'm supposed to make a study on cylindrical shapes using Salome openFOAM coupling.
Problem is I want to make a structured mesh with boundary layers on it. I saw some threads talking about that, but there weren't making any reference to my problem. I understood the process to refine the mesh near the BC walls (I attached some pictures) but my geometry is made of several cylinders crossing each others and I had to use the boolean operation "fuse" to have only one solid that make the fluid volume.

At the intersections of the cylinders, the algorithm of quadrangle mapping doesn't work because I don't have 4 edges (which is logical unfortunatly...) so I wondered if there were a way to project the faces or to do a sketch on the main cylinder (the horizontal one) of the others cylinders to have 4 edges per face instead of using the boolean operation fuse that creates meshing problem (for structured mesh).
I hope I explained it the right way so everybody can understand the problem.

I attached some pictures of my geometry and a structured mesh with a "pseudo" boundary layer I managed to create on a simple cylinder.

Thank you for your replies.

Attachment 8495

Attachment 8496

Attachment 8497

Attachment 8498

hi,
i am doing flow inside a cylinder i have a question how did u mesh that cylinder can please help me im facing problem that is base for my project i am new to this openFoam

[wwrfd]

Originally Posted by vasanthkch

hi,
i am doing flow inside a cylinder i have a question how did u mesh that cylinder can please help me im facing problem that is base for my project i am new to this openFoam

Hi, do you also use Salome to mesh the cylinder? Otherwise I would advice you to use Salome only to export the geometry in STL. file, so you can mesh it with SnappyHexMesh, there are excellent tutorials for meshing a cylinder with it, moreover, when I started my project the version 2.0 of openFOAM wasn't released yet, but the last update SnappyHexMesh has been improved and I think it will be perfect for your projet. You have several tutorials to use SnappyHexMesh, may I suggest you to refer to this one: http://openfoamfoorumi.com/wordpress...inenAaltoU.pdf
You can also refer to this thread for snappyHexmesh:
snappyHexMesh feature edge

If you really want to do the meshing part with salome, I can write you a small tutorial with screen captures to show you how to do it.

Good luck for your project.

Regards.

[j-avdeev]

Originally Posted by wwrfd

If you really want to do the meshing part with salome, I can write you a small tutorial with screen captures to show you how to do it.

Can you made it or post a link to any information around this theme?
Thank you.

[kid]

Hello Robin,
Need structured mesh for NACA0012 airfoil. Salome was used to create un-structured mesh, but for airfoil one required structured mesh for capturing boundary layer.

Can you guide me on how to generate structured mesh in Salome? (not snappyHexMesh)

Regards,
CFDkid