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

Velocity is not calculated in pimpleDyMFoam

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

Like Tree1Likes
  • 1 Post By sharonyue

Reply
 
LinkBack Thread Tools Display Modes
Old   May 6, 2015, 14:03
Default Velocity is not calculated in pimpleDyMFoam
  #1
New Member
 
Join Date: Jan 2014
Posts: 2
Rep Power: 0
Arini is on a distinguished road
Dear All
I'm new in openFoam. At this moment i'm trying to simulate a vertical turbine using AMI and pimpleDyMFoam. I'm running my case successfully but there is something bothering me from the log file which I found there was no solving for any velocity (Ux and Uy) in all iteration. I think the velocity is supposed to be calculated and mentioned in the log file, isn't it?. Does it mean my simulation is not calculating any velocity? How to solve this issue?
Any help will be appreciated. Thank you

Best regards
Arini

Courant Number mean: 0.0579181 max: 574.194
Time = 0.01

solidBodyMotionFunctions::rotatingMotion::transfor mation(): Time = 0.01 transformation: ((0 0 0) (0.999771 (0 0 0.0214144)))
AMI: Creating addressing and weights between 132 source faces and 132 target faces
AMI: Patch source weights min/max/average = 1, 1.00013, 1.00007
AMI: Patch target weights min/max/average = 1, 1.00013, 1.00007
GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.0151048, No Iterations 18
GAMG: Solving for pcorr, Initial residual = 0.253889, Final residual = 0.0166614, No Iterations 1
time step continuity errors : sum local = 4.28193e-05, global = 1.41048e-07, cumulative = 1.41048e-07
PIMPLE: iteration 1
GAMG: Solving for p, Initial residual = 1, Final residual = 0.00899658, No Iterations 10
GAMG: Solving for p, Initial residual = 0.00165518, Final residual = 1.29099e-05, No Iterations 4
time step continuity errors : sum local = 3.78644e-06, global = 5.77749e-07, cumulative = 7.18797e-07
GAMG: Solving for p, Initial residual = 0.00404807, Final residual = 3.5418e-05, No Iterations 10
GAMG: Solving for p, Initial residual = 0.00116074, Final residual = 9.17459e-06, No Iterations 4
time step continuity errors : sum local = 2.71134e-06, global = 4.23926e-07, cumulative = 1.14272e-06
PIMPLE: iteration 2
GAMG: Solving for p, Initial residual = 0.00337371, Final residual = 2.96174e-05, No Iterations 10
GAMG: Solving for p, Initial residual = 0.000972222, Final residual = 7.79675e-06, No Iterations 4
time step continuity errors : sum local = 2.70749e-06, global = 4.52654e-07, cumulative = 1.59538e-06
GAMG: Solving for p, Initial residual = 0.00143422, Final residual = 1.22148e-05, No Iterations 10
GAMG: Solving for p, Initial residual = 0.000684461, Final residual = 5.56497e-06, No Iterations 4
time step continuity errors : sum local = 1.94238e-06, global = 3.34556e-07, cumulative = 1.92993e-06
PIMPLE: iteration 3
GAMG: Solving for p, Initial residual = 0.000713198, Final residual = 5.91503e-06, No Iterations 9
GAMG: Solving for p, Initial residual = 0.000380654, Final residual = 3.26779e-06, No Iterations 4
time step continuity errors : sum local = 1.13974e-06, global = 1.80353e-07, cumulative = 2.11029e-06
GAMG: Solving for p, Initial residual = 5.22887e-05, Final residual = 4.88379e-07, No Iterations 6
GAMG: Solving for p, Initial residual = 1.85897e-05, Final residual = 9.88278e-08, No Iterations 8
time step continuity errors : sum local = 3.47519e-08, global = 7.51709e-09, cumulative = 2.1178e-06
DILUPBiCG: Solving for omega, Initial residual = 0.0400527, Final residual = 3.26906e-07, No Iterations 231
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 6.38729e-05, No Iterations 1001
PIMPLE: converged in 3 iterations
ExecutionTime = 10.54 s ClockTime = 11 s
Attached Files
File Type: txt fvSolution.txt (2.6 KB, 6 views)
Arini is offline   Reply With Quote

Old   June 3, 2015, 23:35
Default
  #2
New Member
 
James Behzadi
Join Date: Oct 2011
Location: Sydney, Australia
Posts: 27
Rep Power: 5
JBUNSW is on a distinguished road
Could you find out why this happens? I am having similar issue. Thanks!
James
JBUNSW is offline   Reply With Quote

Old   June 4, 2015, 07:01
Default
  #3
New Member
 
Join Date: Jan 2014
Posts: 2
Rep Power: 0
Arini is on a distinguished road
Hi James
I still cant figure out what exact problem that cause the issue. I suspect it was because the mesh. What is your case?

Anyone, Is there any clue for us?
Arini is offline   Reply With Quote

Old   June 4, 2015, 09:09
Default
  #4
New Member
 
James Behzadi
Join Date: Oct 2011
Location: Sydney, Australia
Posts: 27
Rep Power: 5
JBUNSW is on a distinguished road
Thanks for prompt reply.
I am running reactingFoam under OpenFOAM-2.0.0. May be that's the issue. The results of simulation are fine, but just wondering why the convergence stuff for Ux and Uy don't show up!
JBUNSW is offline   Reply With Quote

Old   June 4, 2015, 10:21
Default
  #5
Senior Member
 
Dongyue Li
Join Date: Jun 2012
Location: Torino, Italy
Posts: 675
Rep Power: 8
sharonyue is on a distinguished road
Hi James!

When u solve momentum predictor, openfoam will solve Ueqn(). But if not, it will not solve Ueqn(). By default, some cases this is switched off. No wonder there is no iterations about U.

lol
JBUNSW likes this.
__________________
Im the translator of OpenFOAM User Guide Chinese Edition! But always newbie on CFD.
Never too old to learn CFD. Worship these CFD experts.
sharonyue is offline   Reply With Quote

Old   June 4, 2015, 19:56
Default
  #6
New Member
 
James Behzadi
Join Date: Oct 2011
Location: Sydney, Australia
Posts: 27
Rep Power: 5
JBUNSW is on a distinguished road
Thanks Dongyue Li.
JBUNSW 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
Velocity distribution function sampling issue in DSMC flotus1 Main CFD Forum 6 December 13, 2014 07:18
WSS and normal velocity gradient for the slanted pipe wanna88 FLUENT 2 October 1, 2012 22:34
Problem with time average tangential velocity in swirl flow. lakhi FLUENT 5 July 18, 2012 16:28
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15


All times are GMT -4. The time now is 08:29.