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[ICEM] Airfoil mesh recommended way

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Old   May 10, 2010, 02:56
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Karatix
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Hi Brian,

as I have similar problems I cannot really help you, unless you use/have Gambit where they have a good tutorial (from Cornell University). That also allows you to create BC.
Good luck,

Karatix
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Old   May 20, 2010, 14:44
Default lines extrude into shells, etc.
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Simon Pereira
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When you extrude a mesh, shell elements become volume elements, line elements become shell elements, and nodes become line elements...

So, before extruding, make sure that your edges are associated with your curves (so you get line elements in the part names of the curves) and make sure that the curves are in the part names that you want to use for your boundary conditions (Inlet, Outlet, walls, etc.) Then during the extrude, you can set the Top name to "PERIODIC2" or what ever, the volume name to "FLUID" and the sides as "Inherited". Then your extruded mesh will have all shells it needs for you to setup bocos...
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Old   October 13, 2010, 12:39
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Ruben Ruiz
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simon do you have any written tutorial of icem cfd?? I am working on boundary layer laminar-turbulent transition over an irfoil and i would like to know if you have information about creating boundary layer mesh..

hope you can help me
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Old   October 13, 2010, 17:15
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Hi RGRUIZ,

have a look on youtube. Here is the link:
http://www.youtube.com/watch?v=tYrbScUH9RE

Thanks to this tutorial I managed to get a better grid. However, if I remember this tutorial correctly, you could not resolve the boundary layer very well (or at least would cause to many fine cells behind the airfoil, which my PC could not handle).
Instead I used just ogrids around the airfoil (in a square).

Good luck,

Karatix

Last edited by Karatix; October 13, 2010 at 17:18. Reason: Making it easier to follow my comment
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Old   October 15, 2010, 11:34
Default Online tutorials.
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Simon Pereira
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Ruben,

Do you have access to the customer portal (via the www.ansys.com site)?

All you would need is a licensed commercial or academic version of the software. Get you "customer" number (under help) to create your login.

Once in, you will find tutorials, etc.
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Old   January 12, 2011, 13:16
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Alberto Pellegrino
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Hi Simon,

I am new of ICEM. I'm following your great tutorial (2D airfoil), but I can understand 2 things:

1) importing formatted point data (the same format you used), only one curve was created.
Not a real problem actually, I created 2 curves by my hand (upper and lower airfoil).

2) after having created curves (FF), I can not create surfaces (FLUID). I mean, I am able (like seen in your video) but the part FLUID (in the model tree) has not been created.

(in the replay control the family FLUID first created has been deleted by ICEM).

Can you please help me?

Many thanks

Alberto
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Old   January 12, 2011, 14:47
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1) I am just guessing here, but... If you look at my example, the first line had a number 2 in it, which means the number of curves I am extracting. If you left off that number or used a 1, you will get a single curve.

2) Not sure why the Fluid surface failed. Perhaps the curve was not complete or the tolerances are bad. If a part has no entities, it is automatically removed from the tree. I would suggest you go and take a closer look to make sure that the surface is created. But keep in mind, that is personal preference (I like working with a surface), for 2D hexa, you don't actually need one since it keeps mesh in the Z=0 plane anyway. You can just make sure to name your blocking part "FLUID".

Best regards,

Simon
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Old   January 14, 2011, 12:55
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Many thanks for your reply Simon.

I am still not able to create surface (neither from curves nor from points)... can't understand why. The tolerance are 0.001 in every part, so I think not bad...

Anyway, I will create the mesh all the same, not using surface, but I am sure sooner or later I will need to create surfaces... (if you have another idea please let me know)!

Thanks again!
Regards

Alberto
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Old   January 14, 2011, 16:31
Default create a larger surface and just cut it out.
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Sure, assuming this is a 2D model (or at least a planar surface) another idea that I sometimes use when I have trouble getting a 2D surface created...

1) draw a line from 2 points above and wider than the model.

2) draw a second line from 2 points below and wider than the model.

3) create a "surface from 2 to 4 curves" and select the two curves. This will create a surface.

4) Use Build topology or segment surface with a curve and chop the surface with your model curves... Note: Tri-tolerance is very much a factor of segment surface / build topology, so keep an eye out for related issues and reduce the tri-tolerance if you don't like the result.

Have fun.
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Old   January 17, 2011, 13:57
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OK Simon,

I will try... many thanks!

Regards

Alberto
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