CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Polyhedra and sliding mesh?

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 27, 2009, 18:30
Default Polyhedra and sliding mesh?
  #1
New Member
 
Ewan
Join Date: Mar 2009
Posts: 3
Rep Power: 16
rockewan is on a distinguished road
I am doing some simulation in mixing tank using FLUENT. Because the impeller is a close clearance impeller, it has very small gap between the impeller and the tank wall. The impeller blades are quite thin too. All these create a lot of trouble for grid generation. Usually, there would be a couple of grids have a skewness of higher than 0.9 (less than 0.95, though), and a dozen of grids higher than 0.85. Using smaller mesh size doesn't really help reducing the skewness. If I run sliding mesh method on this mesh, usually there would be some convergence problem sooner or later, probably due to the left-handed faces created during the movement of the rotating zone. I tried converting the whole domain to polyhedra mesh. It would run fine and much faster because of much less grids. However, I found that the velocity profile is not physically reasonable on the interface between the rotating zone and the stationary zone. So I was wandering whether I could use polyhedra with sliding mesh, is there any compatability problem? It is also welcome if anyone know how to reduce the skewness effectively without using too much grids. I am already getting about 2 million grids at the moment.

P.S.: I checked the FLUENT user's guide on the polyhedra limitations. It does not say anything on sliding mesh or MRF. FLUENT model compatibility chart didn't say anything about polyhedra mesh either.
rockewan is offline   Reply With Quote

Old   March 28, 2009, 19:10
Default
  #2
Member
 
Join Date: Mar 2009
Posts: 35
Rep Power: 17
panda is on a distinguished road
Currently, polyhedral mesh cannot be used in any moving or sliding mesh model
panda is offline   Reply With Quote

Old   March 29, 2009, 12:31
Default
  #3
New Member
 
Join Date: Mar 2009
Posts: 29
Rep Power: 17
Freeman is on a distinguished road
I agree with panda, Fluent user guide is clear at this point: for now, no capability for sliding mesh with polyhedra mesh ...

Greetings,

Freeman
Freeman is offline   Reply With Quote

Old   July 3, 2009, 05:36
Default
  #4
New Member
 
Join Date: Jul 2009
Posts: 7
Rep Power: 16
Monker1980 is on a distinguished road
Could either of you point me to where in the user guide it says that the polyhedral approach can't be used with sliding meshes? I can only find reference to deforming/dynamic meshes, not sliding meshes.
Monker1980 is offline   Reply With Quote

Old   February 21, 2012, 07:00
Default sliding mesh , plz help
  #5
Member
 
Join Date: Jan 2012
Posts: 58
Rep Power: 14
sheikh nasir is on a distinguished road
hello
i am not able to apply sliding mesh in train moving in tunnel. can any body help me.
my email sheikhnasir39@gmail.com
thanks
sheikh nasir is offline   Reply With Quote

Old   December 1, 2018, 20:07
Default
  #6
New Member
 
jose antonio guzman santana
Join Date: Dec 2017
Posts: 7
Rep Power: 8
LUMBERJACK17 is on a distinguished road
u need to set the interfaces as non sharing faces, then it will let you create a non conformal interface, thats the thing with sliding mesh
LUMBERJACK17 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 00:00.