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Old   February 11, 2013, 12:36
Question 3D Unstructured MESHING
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Arun Krishnan.L.H
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Hi All,
I am new to ICEM and after a few days of reading the manuals and going through many threads in the forum, i have kind of been able to form my mesh(unstructured) for the benchmark case of flow past the cylinder. As you can see from the images, I have used prism to form meshes around the cylinder and also density mesh around the same area. The flow direction is + X. The mesh sizes are assigned using the part mesh and i have tried to change the size of the part meshes,but there was not much change. I have now assigned only 6 layers for the prism and still there is a problem with how the meshes are divided as they go further. I actually want more layers but then the mesh gets worse.
Can anyone please help with me what i can do to improve the mesh?

I will first simulate a uniform flow condition for a low Reynolds number. Later i want to investigate with a higher Reynolds number. In that case to capture the vortices should i extend the prism meshes further down the wake field?

Waiting for a reply

Thanks in advance
Arun

mesh.jpg

3d model.jpg
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Old   February 11, 2013, 12:41
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would you mind if i ask why you not try structured mesh for a simple geometry like this ?
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Old   February 11, 2013, 13:05
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Thanks for you reply.
This case is just to help me learn and simulate a simple problem using ICEM/Fluent. The actual problem i will be tackling is different and i have to use unstructured mesh. So i am just using the same for this problem.

Also my supervisor said.

Can you guide me?
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Old   February 11, 2013, 13:28
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why you have these curve here ??

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Old   February 11, 2013, 14:00
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ya, i am working on the mesh and realized that could be the problem. It is because i have divided the surface in that way to give more points on the circle.

Not sure what is an alternative though?

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Old   February 11, 2013, 14:02
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this is a just a simple geometry to perform test on it. would you mind sharing ? so i and others can investigate the problem ?
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Old   February 11, 2013, 15:16
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Hi there,

Thank you. I have uploaded 3 file the .prj,.uns and.tin.
Hope you will be able to view it.


http://www.4shared.com/file/se6MBx3e/3d-cylinder.html
http://www.4shared.com/file/cYc4LPBN/3d-cylinder.html
http://www.4shared.com/file/AQXHsfMI/3d-cylinder.html

Thanks
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Old   February 11, 2013, 15:25
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please use any free file hosting website that doesn't requires registration. i don't have access to shared4 as i'm not member. use dropbox. it is useful for everything !!
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Old   February 11, 2013, 15:25
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you don't have to join the uns file and the mesh just the project is fine...
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Old   February 11, 2013, 16:39
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Hi ,

I have attached it in dropbox and shared with u.

Thanks
Arun
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Old   February 11, 2013, 16:41
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thank you very much, another thing by prj, i mean tin file too because it contains the geometry. sorry for being demanding...
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Old   February 11, 2013, 16:52
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I have attached. Come on you are trying to help me. Its my bad.

Arun
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Old   February 11, 2013, 17:03
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yes it is because of those curves you need to delete them
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Old   February 11, 2013, 17:08
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problem fixed, the project is saved...
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Old   February 11, 2013, 17:37
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Can you please tell me what you did? I cannot view it now. I can only see it tomorrow.What was the mistake i did?

Thanks a lot for your help.

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Arun
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