CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[GAMBIT] Gambit & 3d open channel flow mesh problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 11, 2010, 11:53
Default Gambit & 3d open channel flow mesh problem
  #1
New Member
 
Join Date: Feb 2010
Posts: 11
Rep Power: 7
esgee is on a distinguished road
Hi,

I'm new to CFD and I couldn't find any solution with the Gambit tutorials I looked. My problem is that I have an open channel where water is flowing to a container. Here is very simple picture about it

http://img14.imageshack.us/img14/2968/channelt.png

The flow is surrounded by three walls and air where atmospheric pressure is acting. I'm having problems how to mesh the system (channel + container) 3D grid. I would appreciate any comments, thanks in advance.
esgee is offline   Reply With Quote

Old   February 12, 2010, 03:06
Default
  #2
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,972
Rep Power: 30
-mAx- will become famous soon enough
what kind of problems?
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 12, 2010, 03:20
Default
  #3
New Member
 
Join Date: Feb 2010
Posts: 11
Rep Power: 7
esgee is on a distinguished road
I am living in thought that only closed volumes can be meshed. My channel is open to air on its one face so how can I mesh its interior? Is multiphase flow (water and air) the only solution?
esgee is offline   Reply With Quote

Old   February 12, 2010, 04:15
Default
  #4
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,972
Rep Power: 30
-mAx- will become famous soon enough
you need definitively a closed volume.
Yes Multphase flow
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   February 12, 2010, 14:21
Default
  #5
New Member
 
Join Date: Feb 2010
Posts: 11
Rep Power: 7
esgee is on a distinguished road
Would this solution work:
I'll set to the boundary conditions that the three walls are stationary and on the fourth wall, there is no shear stress
esgee is offline   Reply With Quote

Old   February 15, 2010, 01:50
Default
  #6
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,972
Rep Power: 30
-mAx- will become famous soon enough
you are talking about the fluent side (BC etc...) and you can open a new thread in the right subcategory (I don't have any experience with open channel) , but you need first a 3d mesh
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   August 1, 2010, 11:28
Smile open cahnnel flow
  #7
Member
 
subha_meter's Avatar
 
Subhasish Mitra
Join Date: Oct 2009
Location: Australia
Posts: 54
Rep Power: 7
subha_meter is on a distinguished road
You need a "volume : brick" to assign the computational domain. You can try applying "wall" BC at 3 sides and "Pressure outlet" on the top surface and provide atmospheric pressure condition over there.

For IN, you can use "mass flow inlet/velocity inlet" & for OUT...."outflow" BC.

For open channel flow, you need to use VOF multiphase model to track air/water interface.
subha_meter is offline   Reply With Quote

Old   April 10, 2012, 00:51
Default
  #8
New Member
 
Hossein
Join Date: Oct 2010
Location: Greensboro, NC, USA
Posts: 24
Rep Power: 6
hossein65 is on a distinguished road
Hi;
The best B.C for upper side of an open channel is "symmetry".
that also helps the free surface level change automatically.
__________________
Hossein Amini
PhD student in Biochemical Engineering; Computational Science and Engineering department;
North Carolina Agricultural and Technical State University
hossein65 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
Boundary condition problem for open channel flow Andy CFX 8 October 1, 2012 07:45
Gambit - Mesh Problem for a complex 3D geometry Nelson FLUENT 3 May 28, 2012 06:57
Problem installing on Ubuntu 9.10 -> 'Cannot open : No such file or directory' mfiandor OpenFOAM Installation 2 January 25, 2010 10:50
Two-phase open channel flow Edwin FLUENT 3 July 11, 2006 02:21
open channel flow boundary conditions yan FLUENT 0 July 4, 2005 23:36


All times are GMT -4. The time now is 10:21.