[ICEM] Negative volumes

Bollonga · January 28, 2013, 07:20

I've redone all the blocking again until I got no negative 3x3x3 determinant. I don't know why I can never execute the pre-mesh quality tool. All the same I's smooth it 20 iterations and exported it to fluent. I all seems to go okay but fluent says there are some left-handed and right-handed faces. I'm already running the simulation but I would like to know what that means and how to fix it.

I've searched this thread but I didn't get much useful info.
http://www.cfd-online.com/Forums/flu...nded-face.html

Thanks!

Pospelov · January 28, 2013, 08:03

Hello.
You have missed the surface.

Bollonga · January 28, 2013, 08:36

Quote:

Originally Posted by Pospelov

Hello.
You have missed the surface.

Thanks, I already corrected that.

Far · January 28, 2013, 09:29

I think it is very simple case for ICEM. I also see many curves and points which are really not required in ICEM except they are made for some special purpose and in fact it is the hidden power of ICEM.

Pospelov · January 28, 2013, 10:25

And you should create O block like this. ))))

Bollonga · January 28, 2013, 10:37

Quote:

Originally Posted by Pospelov

And you should create O block like this. ))))

Thanks a lot Pospelov! You have used the o-grid block option in the blocking tab, right? I also use to force some 1st layer thickness at the smoothing stage.

Pospelov · January 28, 2013, 10:43

Yes. I used it there.

Far · January 28, 2013, 10:44

Yes O-grid will make the solution more accurate

Bollonga · January 28, 2013, 17:44

Quote:

Originally Posted by Pospelov

And you should create O block like this. ))))

How have you made this O-grid exactly? from block? from faces? Edges? vertices?

Thanks

Far · January 28, 2013, 18:13

select solid block (inside plate) and slect optin around and click apply and your are done. If you have deleted the block inside plate then turn on VORF and send inner block to solid by creating new part.

Bollonga · January 29, 2013, 10:08

Quote:

Originally Posted by Far

select solid block (inside plate) and slect optin around and click apply and your are done. If you have deleted the block inside plate then turn on VORF and send inner block to solid by creating new part.

Fine, it was just I was getting O-grid blocks all around the external contour. Thanks.

Bollonga · January 28, 2013, 10:31

Thanks Far, my blocking is still running without any problem. It is very similar to the one you made for me. I'll let you know the results.

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January 28, 2013, 07:20		#1
Bollonga Senior Member Francisco Join Date: Mar 2012 Location: Spain Posts: 273 Rep Power: 15	I've redone all the blocking again until I got no negative 3x3x3 determinant. I don't know why I can never execute the pre-mesh quality tool. All the same I's smooth it 20 iterations and exported it to fluent. I all seems to go okay but fluent says there are some left-handed and right-handed faces. I'm already running the simulation but I would like to know what that means and how to fix it. I've searched this thread but I didn't get much useful info. http://www.cfd-online.com/Forums/flu...nded-face.html Thanks!

January 28, 2013, 10:43		#7
Pospelov Member Alexander Join Date: Nov 2009 Location: Blansko, Czech Republic Posts: 30 Rep Power: 16	Yes. I used it there.

January 28, 2013, 10:44		#8
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Yes O-grid will make the solution more accurate

January 28, 2013, 18:13		#10
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	select solid block (inside plate) and slect optin around and click apply and your are done. If you have deleted the block inside plate then turn on VORF and send inner block to solid by creating new part.

January 28, 2013, 10:31		#12
Bollonga Senior Member Francisco Join Date: Mar 2012 Location: Spain Posts: 273 Rep Power: 15	Thanks Far, my blocking is still running without any problem. It is very similar to the one you made for me. I'll let you know the results.