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

axis-symmetric case

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 15, 2010, 17:23
Default axisymmetric case
  #1
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 7
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
I'm trying to simulate a simple problem - current in a pipe of constant diameter. Tried manually and using the utility makeAxialMesh to create axis-symmetric case. After start simpleFoam solver there are deduced data for 3 vector components.

Time = 201

DILUPBiCG: Solving for Ux, Initial residual = 0.000588805, Final residual = 1.64506e-07, No Iterations 2
DILUPBiCG: Solving for Uy, Initial residual = 0.00149572, Final residual = 5.55529e-07, No Iterations 2
DILUPBiCG: Solving for Uz, Initial residual = 0.00907859, Final residual = 3.0994e-06, No Iterations 2
GAMG: Solving for p, Initial residual = 0.00423031, Final residual = 4.10437e-06, No Iterations 19
GAMG: Solving for p, Initial residual = 4.08028e-06, Final residual = 9.36491e-08, No Iterations 20
GAMG: Solving for p, Initial residual = 9.36482e-08, Final residual = 9.36482e-08, No Iterations 0
time step continuity errors : sum local = 7.21952e-10, global = -5.79737e-12, cumulative = -5.79737e-12
DILUPBiCG: Solving for omega, Initial residual = 0.000178982, Final residual = 3.51317e-06, No Iterations 1
DILUPBiCG: Solving for k, Initial residual = 0.00106769, Final residual = 2.67984e-06, No Iterations 2
ExecutionTime = 3.3 s ClockTime = 5 s


As I understand the project should be quasi-two-dimensional. That is two components should be deduced only. Even, if display data of 3 components it is normal for an axis-symmetric of projects, there is one more problem - the component of velocity Uz for quasi-empty dimension most worse to converge. What to do?

Last edited by Svensson; June 5, 2010 at 09:34. Reason: axisymmetric case
Svensson is offline   Reply With Quote

Old   May 16, 2010, 12:40
Default
  #2
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road
Well, I'm not sure what your exact problem is ...
Can you be more specific?
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   May 17, 2010, 04:21
Default
  #3
Senior Member
 
akidess's Avatar
 
Anton Kidess
Join Date: May 2009
Location: Delft, Netherlands
Posts: 919
Rep Power: 17
akidess will become famous soon enough
It is normal that all three components are still displayed, as the grid is still 3D (just with special cells and boundary conditions). And about Uz: Is it maybe possible that you mixed up X and Z direction during mesh generation (so that Y and Z span your computational plane and X is normal to the side of the wedge)? Did you look at your mesh in paraview to make sure everything is correct?
akidess is offline   Reply With Quote

Old   May 17, 2010, 15:29
Default
  #4
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 7
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
Can look and prompt why badly to converge quasi-empty component of velocity Uz. Here the project:
http://rapidshare.com/files/38847831...in_tube.tar.gz

Last edited by Svensson; May 18, 2010 at 07:35.
Svensson is offline   Reply With Quote

Old   May 20, 2010, 12:35
Default
  #5
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 7
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
Well all right, then can, somebody even to show a correct ready example stationary axial-symmetric flow?
Svensson is offline   Reply With Quote

Old   May 21, 2010, 03:46
Default
  #6
Senior Member
 
akidess's Avatar
 
Anton Kidess
Join Date: May 2009
Location: Delft, Netherlands
Posts: 919
Rep Power: 17
akidess will become famous soon enough
Which solver are you using?
akidess is offline   Reply With Quote

Old   May 21, 2010, 15:15
Default
  #7
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 7
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
simpleFoam.
Svensson is offline   Reply With Quote

Old   May 25, 2010, 04:40
Default
  #8
Senior Member
 
akidess's Avatar
 
Anton Kidess
Join Date: May 2009
Location: Delft, Netherlands
Posts: 919
Rep Power: 17
akidess will become famous soon enough
Your case doesn't run for me using simpleFoam. I assume you are using 1.6 and I'm still on 1.5, so I can't really help you.
akidess is offline   Reply With Quote

Old   May 27, 2010, 19:13
Default
  #9
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 7
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
I have installed OpenFoam 1.5. Hardly has altered the project. The problem is considered. But the quasy-empty direction of viscosity Uz is bad to converge.
Here the project:
http://rapidshare.com/files/39231032....5.tar.gz.html
Svensson 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
[DesignModeler] axis display disparity of model and triad ram881973 ANSYS Meshing & Geometry 12 January 7, 2014 12:51
Free surface boudary conditions with SOLA-VOF Fan Main CFD Forum 10 September 9, 2006 12:24
Doubt in unsteady case vijay FLUENT 1 April 24, 2006 11:11
case stops when fuel injection starts Antony CD-adapco 1 August 7, 2005 13:42
Whatbs best way to create new case jvn OpenFOAM Pre-Processing 2 June 20, 2005 21:19


All times are GMT -4. The time now is 03:05.