[ICEM] 2D Hexa meshing

osamaghani · April 21, 2012, 22:31

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

Any ideas???

Far · April 22, 2012, 02:19

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

http://www.cfd-online.com/Forums/ans...em-fluent.html

osamaghani · April 22, 2012, 15:24

Hi Far,

I tried to do that but ICEM did not allow me. whenever I do the associations of edge to curve...it always selects the entire car geometry rather that single curves...plus 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 ICEN..my 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

Thanks
osama

Far · April 22, 2012, 15:51

attach files

osamaghani · April 22, 2012, 15:54

can I email you the files on turboenginner@gmail.com??

Far · April 22, 2012, 15:57

ya, please.

osamaghani · April 22, 2012, 16:26

check your email...

Ananthakrishnan · April 22, 2012, 19:03

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

http://mecanica.eafit.edu.co/~sorrego/icemtutorial.pdf

. This ebook will be helpful in many ways..

http://mecanica.eafit.edu.co/~sorrego/icemtutorial.pdf

Far · April 22, 2012, 19:40

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, 06:58

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, 16:23

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!

April 21, 2012, 22:31	2D Hexa meshing	#1
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	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 Any ideas???

April 22, 2012, 19:40	First try	#9
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	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.

April 23, 2012, 06:58		#10
BrolY Senior Member AB Join Date: Sep 2009 Location: France Posts: 323 Rep Power: 22	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. Last edited by BrolY; April 23, 2012 at 11:50.

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April 22, 2012, 02:19		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Then do not select all curves and edges while making edge-to-curve association. Rather select the separate boundary curve to corresponding edge. http://www.cfd-online.com/Forums/ans...em-fluent.html

April 22, 2012, 15:24		#3
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	Hi Far, I tried to do that but ICEM did not allow me. whenever I do the associations of edge to curve...it always selects the entire car geometry rather that single curves...plus 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 ICEN..my 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 Thanks osama

April 22, 2012, 15:51		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	attach files

April 22, 2012, 15:54		#5
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	can I email you the files on turboenginner@gmail.com??

April 22, 2012, 15:57		#6
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	ya, please.

April 22, 2012, 16:26		#7
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	check your email...

April 22, 2012, 19:03		#8
Ananthakrishnan Senior Member Ananthakrishnan.A.S Join Date: Feb 2012 Location: Mumbai (Bombay), India Posts: 157 Rep Power: 16	Hi osama, Check out section 4.2.3 or page number 123 in the link http://mecanica.eafit.edu.co/~sorrego/icemtutorial.pdf . This ebook will be helpful in many ways.. http://mecanica.eafit.edu.co/~sorrego/icemtutorial.pdf

April 23, 2012, 16:23		#11
osamaghani New Member Osama Join Date: Mar 2012 Posts: 26 Rep Power: 14	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!