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[ICEM] mesh of a spinnaker

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Old   April 25, 2012, 05:27
Default mesh of a spinnaker
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michele ambrosio
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Any idea about meshing this geometry?
I am not looking for an accurate mesh for the moment.. just need some guidelines to proceed.
The idea is of course to have the mesh more fine close to the sail and coarser away from it. I was thinking about an unstructured mesh, but if anybody knows about a structured one is well accepted.
thanks in advance

michele
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Old   April 25, 2012, 17:05
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I took a look at you geometry. problem i find is Thickness. it's completely ignoring the geometry inside. This is an interesting case, first time i deal with it. I'm quite sure thickness is the problem. Where did you draw your geometry ? if in Ansys modeler, can you attach an IGES file of your geomtry from design modeler
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Old   May 7, 2012, 09:49
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Sorry for replying after so many days, but I was busy. Any suggestion is really appreciated
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Old   May 11, 2012, 08:50
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TRM_SRF has a thickness or it is a surface?
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Old   May 11, 2012, 10:56
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it is a surface?


ok it ishttp://www.google.com.pk/imgres?imgu...PUBMAg&dur=350

http://en.wikipedia.org/wiki/Spinnaker
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Old   May 11, 2012, 11:07
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yes it is only a surface without thickness
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Old   May 11, 2012, 13:58
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I built the mesh, but how to make fluent or cfx will "see" an impenetrable surface without thickness.
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Old   May 11, 2012, 14:15
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@ Ralen:
Just give the boundary conditions of the sail as a wall
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Old   May 11, 2012, 14:16
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Which software did you use for creating the mesh?
thank you a lot in advance for your help
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Old   May 11, 2012, 14:48
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Quote:
Originally Posted by michele ambrosio View Post
@ Ralen:
Just give the boundary conditions of the sail as a wall
This for Fluent. And for CFX a message "Select a BC type." Wall is not acceptable.
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Old   May 11, 2012, 15:26
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Here are the files.
Need some modifications to improve the quality.
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Old   May 11, 2012, 15:29
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pics :



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Old   May 11, 2012, 15:36
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Old   May 11, 2012, 18:36
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Quote:
"Select a BC type." Wall is not acceptable.
Do not specify bc in ICEM. CFX will automatically get the boundary condition using the named selection.

Also use import mesh option in CFX-pre to read the mesh in .cfx or .cfx5
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Old   May 11, 2012, 19:09
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Thank you a lot it has been very useful!
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Old   May 12, 2012, 00:16
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Ralan's topology has the better quality than mine.

Ralan: Could you please check both and indicate what's the difference?


Since your case has surface in 3d , therefore in ICEM one has to explicitly project the faces to the wall of surface geometry.
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Old   May 12, 2012, 00:22
Default Named selection for BC for CFX
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Quote:
Do not specify bc in ICEM. CFX will automatically get the boundary condition using the named selection.
For example, inlet/in will have the inlet boundary and outlet/out will have the outlet boundary. similarly wall has the wall condition.

If your naming scheme does not fulfil these requirments still, specifying the different boundaries will give you option to select them later in CFX pre.

Just right click on the component(your geometry) in CFX-Pre and insert new boundary. In this way you can specify wall, symmetry etc. BCs for the remaining boundaries.
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Old   May 12, 2012, 01:49
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Quote:
Originally Posted by Far View Post
Since your case has surface in 3d , therefore in ICEM one has to explicitly project the faces to the wall of surface geometry.
Yes, I associate the faces to the sail surface.
I built o-grid mesh only for the sail. You built for area around sail. I also used the internal o-grid.
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Last edited by Ralen; May 12, 2012 at 02:24.
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Old   May 12, 2012, 02:11
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Like this ? But still quality is low!!!!

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Old   May 12, 2012, 02:18
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Quote:
Any idea about meshing this geometry?
The mesh extent is not enough in the y- and Z-direction. It is a low velocity simulation and you need at-least 10-15 lengths upstream and 20-25 lengths downstream.
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