How to change the nature of boundary conditions ?

Bedotto · July 27, 2010, 12:08

Hello everyone,

I'm a beginner with Icem and I have a little problem here. I've created a mesh with Icem and I've exported it in .msh for fluent. In this mesh I created curves in order to build the structure of my mesh (2D, path dependance), physically these curves are virtual and I would like to define them with the boundary condition: Interior. But I can't! I've the choice between Velocity inlet, pressure outlet, etc.... How can I modify the boundary value of these curves?

I think the fact that these curves are the frontier between differents meshes is the core of the problem...Maybe the key is to merge all meshes in order to have only one mesh finally? But how can we merge 2d meshes in ICEM?

My best regards

Quentin.

PSYMN · August 2, 2010, 17:08

Right, it is a "single" sided edge, meaning that it only has shell elements on one side of it. This limits its possible bocos and does not include "internal" (which would only be valid for double sided edges (with shells on both sides).

In order too suggest the easiest way to stitch this up, I need to know what kind of mesh it is and how you generated it...? Was there much mesh editing or did you just generate it that way...?

A pic would help.

Simon

Bedotto · August 5, 2010, 13:19

Thanks for the reply PSYMN. I have found the solution by activating "Respect line elements" in mesh parameters. Thus the mesh sees the edge as an internale element of the mesh!

PSYMN · August 6, 2010, 01:12

Great, glad you figured it out...

July 27, 2010, 12:08	How to change the nature of boundary conditions ?	#1
Bedotto New Member Quentin Join Date: May 2009 Posts: 22 Rep Power: 17	Hello everyone, I'm a beginner with Icem and I have a little problem here. I've created a mesh with Icem and I've exported it in .msh for fluent. In this mesh I created curves in order to build the structure of my mesh (2D, path dependance), physically these curves are virtual and I would like to define them with the boundary condition: Interior. But I can't! I've the choice between Velocity inlet, pressure outlet, etc.... How can I modify the boundary value of these curves? I think the fact that these curves are the frontier between differents meshes is the core of the problem...Maybe the key is to merge all meshes in order to have only one mesh finally? But how can we merge 2d meshes in ICEM? My best regards Quentin.

August 2, 2010, 17:08	How did you generate it?	#2
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	Right, it is a "single" sided edge, meaning that it only has shell elements on one side of it. This limits its possible bocos and does not include "internal" (which would only be valid for double sided edges (with shells on both sides). In order too suggest the easiest way to stitch this up, I need to know what kind of mesh it is and how you generated it...? Was there much mesh editing or did you just generate it that way...? A pic would help. Simon

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August 5, 2010, 13:19		#3
Bedotto New Member Quentin Join Date: May 2009 Posts: 22 Rep Power: 17	Thanks for the reply PSYMN. I have found the solution by activating "Respect line elements" in mesh parameters. Thus the mesh sees the edge as an internale element of the mesh!

August 6, 2010, 01:12		#4
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	Great, glad you figured it out...