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osamaghani April 21, 2012 21:31

2D Hexa meshing
I am trying to mesh a 2D car geometry in ICEM..I have followed the 2D hexa Blocking tutorial included in ICEM.

The problem is..I need to define certain parts of the car separately...but when I open the mesh in FLUENT, it does not give me all the parts...rather it combines the entire geometry in one part:confused:

Any ideas???

Far April 22, 2012 01:19

Then do not select all curves and edges while making edge-to-curve association. Rather select the separate boundary curve to corresponding edge.

osamaghani April 22, 2012 14:24

Hi Far,

I tried to do that but ICEM did not allow me. whenever I do the associations of edge to always selects the entire car geometry rather that single how can I decide which edge to associate to what curve??

I am having a lot of issues with 2D hexa meshing..below is a list of my queries..I appreciate your effort..Hi Simon

I have successfully followed the ICEM 2D hexa tutorial...but
I have a few questions/issues about 2D meshing..

1. what is the best strategy for 2D meshing? Blocking or Direct unstructured?

2. what is the best blocking topology for car geometry?

3. When I do blocking and then open mesh in fluent, all the parts on my car geometry are combined to one part...underbody(2D-line/curve)

4. In any case, Blocking or Direct unstructured, I can not see any surface in FLUENT...all I see is mesh elements even though I create surface in ICEM :(

5. When I do direct unstructured, only Patch independent method works...all other methods fail...either ICEM hangs or ends in an error...

I make surface for fluid in IGES is curves for tunnel and car geometry...

I can give you some more information or upload my domain if you can take a look at it...

Please help me...I appreciate your effort


Far April 22, 2012 14:51

attach files

osamaghani April 22, 2012 14:54

can I email you the files on

Far April 22, 2012 14:57

ya, please.

osamaghani April 22, 2012 15:26

check your email...

Ananthakrishnan April 22, 2012 18:03

Hi osama,
Check out section 4.2.3 or page number 123 in the link

. This ebook will be helpful in many ways..

Far April 22, 2012 18:40

First try
I have tried and created some initial blocking. Files sent through email.

Please let me know, if pics need to be removed from the forum.

BrolY April 23, 2012 05:58

I don't know a lot about FLUENT, but I read that Fluent needs curves for a 2D mesh.

So 1) do a bluid topology of your geometry.
2) create parts (inlet, outlet, etc...) and puts curves and points on it.
Those parts will be your boundary in FLUENT.
3) if you use blocking, always associate the curves to the edges, especially those which are used for the BOCOS.

The patch dependent didn't work because you need a very good topology -> build topology is compulsory for this method.

Also, post some pictures with the parts you defined in ICEM, it would help.

osamaghani April 23, 2012 15:23

Hi alex,
thanks for the info! that explains my problem about patch dependent method.
I will keep your advice in mind next time when I post...Far helped me with blocking so that problem is also resolved!

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