# Velocity is not calculated in pimpleDyMFoam

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May 6, 2015, 14:03
Velocity is not calculated in pimpleDyMFoam
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Join Date: Jan 2014
Posts: 2
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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
 fvSolution.txt (2.6 KB, 6 views)

 June 3, 2015, 23:35 #2 New Member   James Behzadi Join Date: Oct 2011 Location: Sydney, Australia Posts: 27 Rep Power: 5 Could you find out why this happens? I am having similar issue. Thanks! James

 June 4, 2015, 07:01 #3 New Member   Join Date: Jan 2014 Posts: 2 Rep Power: 0 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?

 June 4, 2015, 09:09 #4 New Member   James Behzadi Join Date: Oct 2011 Location: Sydney, Australia Posts: 27 Rep Power: 5 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!

 June 4, 2015, 10:21 #5 Senior Member   Dongyue Li Join Date: Jun 2012 Location: Torino, Italy Posts: 675 Rep Power: 8 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.

 June 4, 2015, 19:56 #6 New Member   James Behzadi Join Date: Oct 2011 Location: Sydney, Australia Posts: 27 Rep Power: 5 Thanks Dongyue Li.

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