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

meshing and boundary condition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 31, 2011, 14:40
Default
  #81
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
huh? bro, why? sorry a stupid question
no183 is offline   Reply With Quote

Old   February 1, 2011, 01:54
Default
  #82
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
because you don't need those volumes.
They are isolated volumes without any fluid-connection to your computationnal domain.
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 4, 2011, 11:11
Default
  #83
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
oh sorry heading for my CNY holiday, get to work. now i know, i deleted it, can i start meshing?
no183 is offline   Reply With Quote

Old   February 8, 2011, 07:31
Default
  #84
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
? are u there bro?
no183 is offline   Reply With Quote

Old   February 8, 2011, 08:32
Default
  #85
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
Quote:
Originally Posted by no183 View Post
can i start meshing?
yes you can
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 09:07
Default
  #86
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
ok, i meshed it.. Unfortunately, it caused me around 30 minutes, and this time, all the result i save for u to analyse. i get some of the meaning, but some not. Guide me thanks
no183 is offline   Reply With Quote

Old   February 9, 2011, 09:18
Default
  #87
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
Examine face face.3086, you will see that skewed cells are linked with topology "issue" like sharge angle etc...
Use merge tools for fixing this problem.
Then same thing with face face.2557, etc....
But as I already told you, I would FIRST try to mesh your domain without all your fans, which will give your lots of "clean-up" work
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 09:36
Default
  #88
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
Quote:
Originally Posted by -mAx- View Post
But as I already told you, I would FIRST try to mesh your domain without all your fans, which will give your lots of "clean-up" work
How to mesh domain without fan? i using mesh volume feature which select all volume at once?
no183 is offline   Reply With Quote

Old   February 9, 2011, 09:40
Default
  #89
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
when you started with import: delete fan's volumes before substracting
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 09:44
Default
  #90
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
hmm, ok forget about deleting the fan volume first, i will try with examine face, for examine face, what shud i do? where is the examine face button?
no183 is offline   Reply With Quote

Old   February 9, 2011, 09:51
Default
  #91
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
direct above your windows clock
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 09:56
Default
  #92
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
That is examine mesh, fine. now i press it. Where to edit so that i can examine face 3086? This is the place where only i can see the quality of the mesh.
no183 is offline   Reply With Quote

Old   February 9, 2011, 10:15
Default
  #93
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
go to range
select all kind of elements (hexa/pyramid/wedge/tetra)
set lower limit to 0.9
set upper limit to 1
and display...
all the displayed element should be fixed (especially elements between 0.95 and 1)

Then check where are the cells, they should be focused at one topology "issue" like sharp edge etc...
Then exit to the examine panel, et display the surfaces where Gambit failed to mes the surfaces. You should recongnize the topology "issues"...
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 10:21
Default
  #94
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
i presume i done it correctly? but why when i press update, it will reset back lower and upper limit 0 and 1 with no element in there? NOTE THAT i already change the lower and upper limit as u say
no183 is offline   Reply With Quote

Old   February 9, 2011, 10:40
Default
  #95
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
your volume mesh failed, that's why you cannot see any volume elements (because you don't have any)
do the same but with 2d elements
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 10:52
Default
  #96
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
wow, can i did this while i off mesh in display attribute? cause it is annoying freaking long just to see it. and i cant rotate the screen(left click turn) as all hang started again
no183 is offline   Reply With Quote

Old   February 9, 2011, 11:00
Default
  #97
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
with 2 elements, it shouldn't be slow.
With 10miilions volume elements, then yes, you can pray that your session won't crash.
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 9, 2011, 11:10
Default
  #98
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
ya, finnaly at the end, i am NOT able to see it. i will consider removing the fan volume again then if that is the only idea
no183 is offline   Reply With Quote

Old   February 23, 2011, 10:43
Default
  #99
Member
 
no183
Join Date: Sep 2010
Posts: 81
Rep Power: 7
no183 is on a distinguished road
hey, i am back, remeber last time i say i want to remove the fan, i did it. and here is the summary.
I import the STP file and delete the fan partition.
Then unite whole volume, subtract it to get fluid domain.
Then i mesh using "Mesh Volume" with spacing of 1. Fortunately, 1 equisized skew issue only comes out. But, mesh fail and the transcript state that due to face 43, asking me to mesh face 43 using the "Mesh face" function(i guess i correctly digested the meaning?)
Then i do face meshing at face 43, here is the result
i am running out of idea now. What should i do?
no183 is offline   Reply With Quote

Old   February 24, 2011, 04:30
Default
  #100
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,125
Rep Power: 32
-mAx- will become famous soon enough
you are trying to mesh your face (complex one) with quad.
Forget trying to mesh your volume with hexa.
Switch with tetra (tri for surface mesh)
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[GAMBIT] 3D boundary layer and meshing problem in GAMBIT 2.4.6 prashanthreddyh ANSYS Meshing & Geometry 1 December 20, 2011 01:35
Boundary layer meshing problem in Gambit Crystal FLUENT 0 June 12, 2009 20:58
GAMBIT problem with 3D Boundary Layer when meshing Anthony Haroutunian FLUENT 2 March 26, 2008 03:02
Help Urgent about changing boundary condition Anjum Naveed FLUENT 7 August 14, 2006 12:25
Boundary Layer Meshing of a nosecone Chris FLUENT 1 March 15, 2005 13:42


All times are GMT -4. The time now is 15:15.