[ICEM] geometry repair

yuhehuan · October 14, 2012, 02:56

I also have a question. If I checked the model, for example the surface after import the igs file into ICEM and it is said that one surface is checked to have a problem. What should i do to repair the surface?

yuhehuan · October 14, 2012, 03:47

Hi, I solved the problem of the mess mesh. But the mesh quality is still bad. So far, I don't know what the problem it is.

Far · October 14, 2012, 03:50

attach blocking

yuhehuan · October 14, 2012, 04:00

attach blocking?

Far · October 14, 2012, 04:00

Yes. .blk file....

yuhehuan · October 14, 2012, 04:12

I am so sorry. It is 3 am in my region. So, just a little tired. I attached a new file now.Thank you!

yuhehuan · October 16, 2012, 12:49

Hi, Far. I think I found what the problem exsits. I tried to change the outlet to the upper surface to make the inlet not too close to the outlet. And the convergence is better than before. And I guess the uncrtucted mesh I generated is good enough for the fluent calculation. So, as you said, it is not the problem of the tetro mesh, it is the problem of the geometry. But the structed mesh is also bad. But anyway, could you give me a detailed explanation about the idea you said " extend the inlet and outlet domain and apply slip BOCO on them and record the data at the original inlet and outlet planes. " Thank you so so much for your help. I am looking forward to your reply.

Best Wishes!

diamondx · October 16, 2012, 13:10

keep the inlet and outlet in your geometry, in the meshing tab, declare them as "internal wall". Now, extend your outlet. In fluent, the extended outlet will be the real outlet, and the outlet that you declared internal wall will be interior.
The extension is for a stability in the calculation, you are more intererested in knowing what's going wrong in your outlet (interior one). you kept it interior so you can visualize it easily in the post processing. am i clear enough ??? let me know...

Far · October 16, 2012, 13:20

Hey Ali
Lets try our skills of hexa meshing on this geometry. What do you say?

@yuhehuan

If you apply the no slip boundary condition on the extended domain then you will have the extra effects of the boundary layer growth and which are not present in the original geometry.

diamondx · October 16, 2012, 13:28

@far i will , i'm a little bit busy right now... we keep in touch

diamondx · October 16, 2012, 13:35

could you get a good blocking so far ??

Far · October 16, 2012, 13:36

Quote:

Originally Posted by diamondx

could you get a good blocking so far ??

Hopefully, I will get one by tomorrow. Any update on multi-zone?

diamondx · October 16, 2012, 13:56

it worked for one geometry but not the other. trying to investigate the problem more... i realized that the one in which it didn't work had a bad geometry... I'll try everything once again this week end.

yuhehuan · October 16, 2012, 23:19

Hi, Ali. I am sorry I didn't completely understand your idea. I tried to extend the outlet surface using "extend surface" command. But I am not sure which sub-command shoud be used. Need I extend both inlet and outlet in ICEM or in FLUENT? Thank you so much!

Regards!

Rong

Quote:

Originally Posted by diamondx

keep the inlet and outlet in your geometry, in the meshing tab, declare them as "internal wall". Now, extend your outlet. In fluent, the extended outlet will be the real outlet, and the outlet that you declared internal wall will be interior.
The extension is for a stability in the calculation, you are more intererested in knowing what's going wrong in your outlet (interior one). you kept it interior so you can visualize it easily in the post processing. am i clear enough ??? let me know...

yuhehuan · October 17, 2012, 18:19

I tried to extend the inlet and outlet of my geometry. But I am not sure it's correct. Is is like this after extended?

diamondx · October 17, 2012, 21:11

yes that's was i was reffering to, may be more if you can handle large large element. keep your original outlet. declare them as internal wall, and export them as interior...

yuhehuan · October 18, 2012, 19:01

Hi, Ali. I tried to defined the inlet and outlets as internal walls. But I am not sure how to define. Do I just name it? I divided mesh on the whole geometry after extend the inlet and outlets. The result is as the following picture. Do I just need to divide mesh on the original mesh and split mesh on the internal walls or divide mesh on the geometry including the extension part? Many thanks!

October 16, 2012, 13:10		#28
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	keep the inlet and outlet in your geometry, in the meshing tab, declare them as "internal wall". Now, extend your outlet. In fluent, the extended outlet will be the real outlet, and the outlet that you declared internal wall will be interior. The extension is for a stability in the calculation, you are more intererested in knowing what's going wrong in your outlet (interior one). you kept it interior so you can visualize it easily in the post processing. am i clear enough ??? let me know... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

October 16, 2012, 13:28		#30
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	@far i will , i'm a little bit busy right now... we keep in touch __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

October 16, 2012, 13:35		#31
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	could you get a good blocking so far ?? __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

October 16, 2012, 13:56		#33
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	it worked for one geometry but not the other. trying to investigate the problem more... i realized that the one in which it didn't work had a bad geometry... I'll try everything once again this week end. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

October 17, 2012, 21:11		#36
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	yes that's was i was reffering to, may be more if you can handle large large element. keep your original outlet. declare them as internal wall, and export them as interior... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

October 14, 2012, 02:56		#21
yuhehuan Member Rong Yue Join Date: Oct 2012 Location: Canada Posts: 65 Rep Power: 13	I also have a question. If I checked the model, for example the surface after import the igs file into ICEM and it is said that one surface is checked to have a problem. What should i do to repair the surface?

October 14, 2012, 03:50		#23
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	attach blocking

October 14, 2012, 04:00		#24
yuhehuan Member Rong Yue Join Date: Oct 2012 Location: Canada Posts: 65 Rep Power: 13	attach blocking?

October 16, 2012, 12:49		#27
yuhehuan Member Rong Yue Join Date: Oct 2012 Location: Canada Posts: 65 Rep Power: 13	Hi, Far. I think I found what the problem exsits. I tried to change the outlet to the upper surface to make the inlet not too close to the outlet. And the convergence is better than before. And I guess the uncrtucted mesh I generated is good enough for the fluent calculation. So, as you said, it is not the problem of the tetro mesh, it is the problem of the geometry. But the structed mesh is also bad. But anyway, could you give me a detailed explanation about the idea you said " extend the inlet and outlet domain and apply slip BOCO on them and record the data at the original inlet and outlet planes. " Thank you so so much for your help. I am looking forward to your reply. Best Wishes!

October 16, 2012, 13:20		#29
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Hey Ali Lets try our skills of hexa meshing on this geometry. What do you say? @yuhehuan If you apply the no slip boundary condition on the extended domain then you will have the extra effects of the boundary layer growth and which are not present in the original geometry.

October 18, 2012, 19:01		#37
yuhehuan Member Rong Yue Join Date: Oct 2012 Location: Canada Posts: 65 Rep Power: 13	Hi, Ali. I tried to defined the inlet and outlets as internal walls. But I am not sure how to define. Do I just name it? I divided mesh on the whole geometry after extend the inlet and outlets. The result is as the following picture. Do I just need to divide mesh on the original mesh and split mesh on the internal walls or divide mesh on the geometry including the extension part? Many thanks!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[GAMBIT] Geometry repair	doodek	ANSYS Meshing & Geometry	5	February 10, 2011 14:42
ICEM --- question about repair geometry	zhaohui	ANSYS Meshing & Geometry	1	April 21, 2010 18:54
repair the geometry in the ANSYS-ICEM	feixiangniao	ANSYS Meshing & Geometry	3	March 31, 2010 05:53
how to repair geometry by another way	Priscila	CFX	4	August 2, 2007 11:43
vitual _ real	deneb	FLUENT	3	January 22, 2007 04:31