combustion chamber meshing

renu · March 14, 2010, 07:53

Good evening friends,

Iam trying to do cold flow analysis of a Diesel engine. For that i want to mesh the combustion chamber(inlet,outlet,piston,cylinder).From tutorials i got some idea about dynamic mesh.

1)But iam confused about how to start the initial mesh with ICEM.

2)Means which one i have to mesh first.and which type of mesh i have to use,Tetra or Hexa.(For which we component we have to use surface and volume meshes)

Here iam expecting small suggestions thats enough.

Thanks in advance.

PSYMN · March 15, 2010, 10:04

If you are planning for birth and death of cells as the piston moves, then you should at least do the cylinder with hexas... Similarly, you may want to model a cylinder around the valves and put hexas in there.

You really could do the entire bowl with hexa, but some people find that difficult to do.

You could also use Tetras to more easily mesh any "difficult regions".

You would then need to merge your tetra and hexa regions together...

It is really a big question with lots of variables, and this is really a small answer...

renu · March 15, 2010, 23:31

Good morning friends.
Thanku for u r replay.
can we mesh entire combustion chamber with tetra mesh.

PSYMN · March 16, 2010, 15:05

I have seen it done that way... Not often, but I have seen it.

March 14, 2010, 07:53	combustion chamber meshing	#1
renu New Member Join Date: Jan 2010 Posts: 14 Rep Power: 16	Good evening friends, Iam trying to do cold flow analysis of a Diesel engine. For that i want to mesh the combustion chamber(inlet,outlet,piston,cylinder).From tutorials i got some idea about dynamic mesh. 1)But iam confused about how to start the initial mesh with ICEM. 2)Means which one i have to mesh first.and which type of mesh i have to use,Tetra or Hexa.(For which we component we have to use surface and volume meshes) Here iam expecting small suggestions thats enough. Thanks in advance.

March 15, 2010, 10:04	Small answer	#2
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	If you are planning for birth and death of cells as the piston moves, then you should at least do the cylinder with hexas... Similarly, you may want to model a cylinder around the valves and put hexas in there. You really could do the entire bowl with hexa, but some people find that difficult to do. You could also use Tetras to more easily mesh any "difficult regions". You would then need to merge your tetra and hexa regions together... It is really a big question with lots of variables, and this is really a small answer...

March 16, 2010, 15:05	Sure...	#4
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	I have seen it done that way... Not often, but I have seen it.

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March 15, 2010, 23:31		#3
renu New Member Join Date: Jan 2010 Posts: 14 Rep Power: 16	Good morning friends. Thanku for u r replay. can we mesh entire combustion chamber with tetra mesh.