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hagupta June 6, 2006 08:22

Internal Walls in Hex
 
Hi,

I need internal walls so that I can join 2 parts of my geometry in CFX Pre. So, in one of these meshes I am trying to use internal walls for the surfaces that are to be interfaced in Pre with the other geometry.

I am unable to associate face(of block) with surfaces because on doing this my mesh gets distorted.

Please help. Thank you in anticipation. hagupta

myron June 6, 2006 09:09

Re: Internal Walls in Hex
 
When you associate the face of a block to a surface - then the mesh looks for the closest surface. So you'll want to have a surface that corresponds to the face you're associating.

You can get around this by creating a new Part/Family with only a point in it. Then you can associate the face to that Part. Since there's no surface in the Part, the shape of the face will be interpolated based on the shape of the bounding edges. (You may need to dis-associate the bounding edges and vertices.)

hagupta June 6, 2006 09:31

Re: Internal Walls in Hex
 
>>You can get around this by creating a new Part/Family with only a point in it. Then you can associate the face to that Part. Since there's no surface in the Part, the shape of the face will be interpolated based on the shape of the bounding edges. (You may need to dis-associate the bounding edges and vertices.)

Since the edges of the block are already associated to curves, when I will associate the face of this block to a surface or an empty part, thee block gets distorted and hence the mesh.

I am using the internal walls only because i need the surface name in Pre. These internal walls are actually some regions of the curved surface area of a cylinder. So the blocking has been done for the cylinder ignoring these internal walls.

hagupta June 6, 2006 10:21

Re: Internal Walls in Hex
 
Here, you can find a description of my problem. http://tp-txdp4281.content-type.com/...xplanation.jpg

It would be better if we could talk in terms of the terminology used in the link above.

Thanks.

myron June 7, 2006 09:09

Re: Internal Walls in Hex
 
If I understand correctly - you're calling the mesh "distorted" when the nodes on the edges take the shape of the associated curves. Is that correct? That's the joy of block structured meshing - especially with these elongated circular shapes caused by the nozzles entering at the fairly sharp angle. Your mesh will be somewhat limited by the shape of the geometry. You'll have to build your blocking appropriately.

It would be much easier to get an acceptable quality mesh if you use tets/prisms rather than hexas for these types of geometry.

You'll be better off working with Ansys/ICEM support on this.


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