CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLOW-3D

Boundary conditions in a spillway

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 7, 2012, 10:07
Default Boundary conditions in a spillway
  #1
New Member
 
Miguel
Join Date: Oct 2012
Posts: 7
Rep Power: 4
miguel7799 is on a distinguished road
Hi. I was trying to model the flow in a spillway but at the moment im having some problems in boudary conditions. I would like to difine the entrace fluid elevation but my geometry isnt ortonormal to the axis.

I have another question related to the mesh. I want to create a mesh only where spliway is. I just dont know if that is possible and how to do it. I will attach a image.

miguel7799 is offline   Reply With Quote

Old   November 8, 2012, 07:09
Default
  #2
New Member
 
Jibran
Join Date: Oct 2012
Location: Swansea, UK
Posts: 25
Rep Power: 4
Jibran is on a distinguished road
As far as I know, your geometry has to be aligned with the axis since you can only specify the initial pressure field in x, y or z direction. For, creating the mesh, you should try the multi block meshing technique. It would definitely save you a lot of time considering your geometry. I am new to Flow-3D, so maybe someone else can answer you better.
Jibran is offline   Reply With Quote

Old   November 8, 2012, 10:17
Default
  #3
New Member
 
Miguel
Join Date: Oct 2012
Posts: 7
Rep Power: 4
miguel7799 is on a distinguished road
I read that i can use stl file to define where initial water is and then let the gravity works. I just dont know how to do it. Anyway wont multi block extend the simulation time? and increase truncation errors?
miguel7799 is offline   Reply With Quote

Old   November 9, 2012, 05:16
Default
  #4
New Member
 
Jibran
Join Date: Oct 2012
Location: Swansea, UK
Posts: 25
Rep Power: 4
Jibran is on a distinguished road
Multi block technique would definitely be faster! Instead of meshing the whole block domain you can just focus on the region where the spillway is. See Flow-3D help for more details (Multi-Block Meshes). I don't think so it would be a cause of significant errors provided there is a smooth transition between adjacent mesh blocks.

Also go through the "Reducing Memory Use" topic in FLow-3D help, it might be useful.
Jibran is offline   Reply With Quote

Old   November 10, 2012, 12:35
Default
  #5
New Member
 
Miguel
Join Date: Oct 2012
Posts: 7
Rep Power: 4
miguel7799 is on a distinguished road
thanks a lot. I will use multi-block for sure. Anyway i will need to know the flow caractheristics in certain sections. I read that i will need to use baffle. How can i set baffles in exact location that i need? Can i draw a plan in autocad and then use stl plan to turn into a baffle?
miguel7799 is offline   Reply With Quote

Old   November 13, 2012, 08:36
Default
  #6
New Member
 
Jibran
Join Date: Oct 2012
Location: Swansea, UK
Posts: 25
Rep Power: 4
Jibran is on a distinguished road
I don't think u need to do that. Please check 'Flux Surfaces' in help.
Jibran is offline   Reply With Quote

Old   December 1, 2012, 17:06
Default
  #7
New Member
 
Miguel
Join Date: Oct 2012
Posts: 7
Rep Power: 4
miguel7799 is on a distinguished road
I have free surface profiles in certain sections in the tunnel from physical model and i need to compare that profiles to results in my CFD model.



I will like to ask if anybody has some idea to get free surface section profiles for a certain section from my CFD model. Maybe i will need to use a post-processor software right?

Im trying to open the results with Paraview but i just cant :S

Can somebody help me please?

Last edited by miguel7799; December 6, 2012 at 07:24.
miguel7799 is offline   Reply With Quote

Old   December 6, 2012, 07:26
Default
  #8
New Member
 
Miguel
Join Date: Oct 2012
Posts: 7
Rep Power: 4
miguel7799 is on a distinguished road
anyone? I tried with EnSight free, but there are some limitations that make it impossible to opening the file.
miguel7799 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
symmetry boundary conditions in cfx lost.identity CFX 41 May 22, 2013 07:21
Impinging Jet Boundary Conditions Anindya Main CFD Forum 24 January 11, 2012 14:40
OpenFOAM Variable Velocity Boundary Conditions NickolasPl OpenFOAM Programming & Development 2 May 19, 2011 05:37
boundary conditions and mesh exporting vaina74 Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 May 27, 2010 09:38
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15


All times are GMT -4. The time now is 20:33.