[ICEM] ICEM - Blocking stratergy for simple pipe

hob · March 13, 2013, 18:37

Hi all,

I am attempting a structured mesh in ICEM for a simple pipe (parabola with a flat base).

I however cannot get the mesh between surfaces correct (second picture), are there any tutorials for pipe flow with external and internal meshes? (if that makes sense!)

Also I was generating the mesh on the pipe by deleting blocks (between internal and external surface) and associating edges to surface, I haven't merged any verticies and am stuck with how to map the top.

Far · March 14, 2013, 10:01

http://www.cfd-online.com/Forums/ans...osed-wing.html

hob · March 16, 2013, 07:04

Quote:

Originally Posted by Far

http://www.cfd-online.com/Forums/ans...osed-wing.html

Many thanks Far,

I have attempted (a lot of times!) using o-grid (half and full) hoever I get a similar error each time (volume error) but the volumes appear to be ok (fluent confirms the error though.) I am not sure where I am going wrong with blocking.

Far · March 16, 2013, 09:22

I see some error on one of the surfaces. Also you need to maker to one outer O-grid.

Far · March 16, 2013, 12:42

Here is the blocking for you

Some adjustments in edge sizing is required. Also move some vertices to make the quality better.

Do you feel like this while working with ICEM Hexa

Some images from attached blocking :

hob · March 17, 2013, 14:40

Many thanks Far!

I had a look at the mesh and it looks good, I still get volume errors though. I am starting to think it is impossible not to get them!

Far · March 17, 2013, 14:43

Quote:

Originally Posted by hob

Many thanks Far!

I had a look at the mesh and it looks good, I still get volume errors though. I am starting to think it is impossible not to get them!

volume errors like?

Far · March 17, 2013, 15:30

Quote:

Originally Posted by hob

Many thanks Far!

I had a look at the mesh and it looks good, I still get volume errors though. I am starting to think it is impossible not to get them!

Did you turn-off Solid ?

hob · March 17, 2013, 16:59

Quote:

Originally Posted by Far

Did you turn-off Solid ?

I think I did! How do you turn on/off solids?

Far · March 17, 2013, 17:35

It is on left side in parts. It was made when I changed material to solid.

Are you going to model heat transfer?

hob · March 17, 2013, 17:36

Quote:

Originally Posted by Far

It is on left side in parts. It was made when I changed material to solid.

Are you going to model heat transfer?

Many thanks! Do you need to create solids rather than deleting blocks? and yes it will be for heat transfer in fluent.

Far · March 17, 2013, 17:50

Both methods are same. But I am comfortable with "solid" method as it helps in making O-grid.

I checked mesh in Fluent and no negative volume is there.

March 14, 2013, 10:01	You are lucky	#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	http://www.cfd-online.com/Forums/ans...osed-wing.html

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March 16, 2013, 09:22		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	I see some error on one of the surfaces. Also you need to maker to one outer O-grid.

March 17, 2013, 14:40		#6
hob New Member Jimmi Join Date: Dec 2012 Posts: 11 Rep Power: 13	Many thanks Far! I had a look at the mesh and it looks good, I still get volume errors though. I am starting to think it is impossible not to get them!

March 17, 2013, 17:35		#10
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	It is on left side in parts. It was made when I changed material to solid. Are you going to model heat transfer?

March 17, 2013, 17:50		#12
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Both methods are same. But I am comfortable with "solid" method as it helps in making O-grid. I checked mesh in Fluent and no negative volume is there.