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May 4, 2013, 23:09 
dynamic Mesh is faster than MRF????

#1 
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 841
Rep Power: 18 
Hi guys,
I am simulating a mixer3D case, totally mesh is about 200m. I expect MRFInterFoam could be faster than interDyMFoam, but via the log, interDyMFoam is faster. Both the result is fine.So why?any comments would be appreciated. MRFlog Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 Reading field p_rgh Reading field U Reading/calculating face flux field phi AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 1, 1.00723, 1.00001 AMI: Patch target weights min/max/average = 1, 1.00723, 1.00001 Reading transportProperties Selecting incompressible transport model Newtonian Selecting incompressible transport model Newtonian Selecting turbulence model type RASModel Selecting RAS turbulence model kEpsilon bounding k, min: 0 max: 1 average: 1 bounding epsilon, min: 0 max: 20 average: 20 kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; sigmaEps 1.3; } Reading g Calculating field g.h No finite volume options present Creating MRF zone list from MRFProperties creating MRF zone: zone1 PIMPLE: Operating solver in PISO mode time step continuity errors : sum local = 0, global = 0, cumulative = 0 DICPCG: Solving for pcorr, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors : sum local = 0, global = 0, cumulative = 0 Courant Number mean: 0 max: 0 Starting time loop Courant Number mean: 0 max: 0 Interface Courant Number mean: 0 max: 0 deltaT = 1.07991e05 Time = 1.07991e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = 0.0495223, No Iterations 19 time step continuity errors : sum local = 1.7138e06, global = 1.29864e08, cumulative = 1.29864e08 DICPCG: Solving for p_rgh, Initial residual = 0.122609, Final residual = 0.00580765, No Iterations 14 time step continuity errors : sum local = 4.70704e07, global = 4.78148e09, cumulative = 1.77679e08 DICPCG: Solving for p_rgh, Initial residual = 0.017567, Final residual = 9.90151e08, No Iterations 161 time step continuity errors : sum local = 8.01748e12, global = 5.02083e14, cumulative = 1.77678e08 DILUPBiCG: Solving for epsilon, Initial residual = 0.000142027, Final residual = 1.31604e09, No Iterations 3 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 1.12205e09, No Iterations 7 ExecutionTime = 9.97 s ClockTime = 10 s Courant Number mean: 0.00216553 max: 0.53051 Interface Courant Number mean: 0 max: 0 deltaT = 1.0177e05 Time = 2.09761e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.44695e30 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.160646, Final residual = 0.0072516, No Iterations 26 time step continuity errors : sum local = 5.00609e07, global = 9.94811e09, cumulative = 7.8197e09 DICPCG: Solving for p_rgh, Initial residual = 0.0921909, Final residual = 0.00435461, No Iterations 8 time step continuity errors : sum local = 2.83072e07, global = 2.82049e09, cumulative = 4.99921e09 DICPCG: Solving for p_rgh, Initial residual = 0.0085199, Final residual = 9.89058e08, No Iterations 170 time step continuity errors : sum local = 6.29855e12, global = 1.17153e13, cumulative = 4.99932e09 DILUPBiCG: Solving for epsilon, Initial residual = 3.50951e05, Final residual = 2.19052e09, No Iterations 2 bounding epsilon, min: 0.961442 max: 12468.1 average: 319.429 DILUPBiCG: Solving for k, Initial residual = 0.00849041, Final residual = 1.83622e09, No Iterations 4 ExecutionTime = 18.62 s ClockTime = 18 s Courant Number mean: 0.00204717 max: 0.556823 Interface Courant Number mean: 0 max: 0 deltaT = 9.13693e06 Time = 3.0113e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 7.2564e31 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 7.53487e31 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0608071, Final residual = 0.00295234, No Iterations 19 time step continuity errors : sum local = 2.65526e07, global = 3.68452e10, cumulative = 5.36777e09 DICPCG: Solving for p_rgh, Initial residual = 0.0164258, Final residual = 0.000808253, No Iterations 13 time step continuity errors : sum local = 7.18554e08, global = 1.17925e09, cumulative = 6.54703e09 DICPCG: Solving for p_rgh, Initial residual = 0.00174533, Final residual = 9.50677e08, No Iterations 153 time step continuity errors : sum local = 8.46815e12, global = 6.33871e14, cumulative = 6.54696e09 DILUPBiCG: Solving for epsilon, Initial residual = 3.00088e05, Final residual = 1.60449e09, No Iterations 2 bounding epsilon, min: 3.14248 max: 11394.3 average: 319.679 DILUPBiCG: Solving for k, Initial residual = 0.00602194, Final residual = 8.43019e10, No Iterations 4 ExecutionTime = 26.5 s ClockTime = 26 s Courant Number mean: 0.00183615 max: 0.525867 Interface Courant Number mean: 0 max: 0 deltaT = 8.68739e06 Time = 3.88004e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.04223e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.04223e30 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0338219, Final residual = 0.00151052, No Iterations 19 time step continuity errors : sum local = 1.2876e07, global = 1.12176e10, cumulative = 6.43479e09 DICPCG: Solving for p_rgh, Initial residual = 0.00809159, Final residual = 0.000383803, No Iterations 13 time step continuity errors : sum local = 3.19975e08, global = 2.05515e10, cumulative = 6.22927e09 DICPCG: Solving for p_rgh, Initial residual = 0.000821271, Final residual = 9.88127e08, No Iterations 147 time step continuity errors : sum local = 8.20908e12, global = 2.54011e14, cumulative = 6.2293e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.74772e05, Final residual = 2.21332e09, No Iterations 2 bounding epsilon, min: 15.8509 max: 10622.5 average: 320.093 DILUPBiCG: Solving for k, Initial residual = 0.0049088, Final residual = 8.57433e10, No Iterations 4 ExecutionTime = 34.34 s ClockTime = 34 s Courant Number mean: 0.0017467 max: 0.513383 Interface Courant Number mean: 0 max: 0 deltaT = 8.46083e06 Time = 4.72612e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.03781e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.6606e30 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0229209, Final residual = 0.00111938, No Iterations 18 time step continuity errors : sum local = 8.28057e08, global = 2.41502e11, cumulative = 6.20515e09 DICPCG: Solving for p_rgh, Initial residual = 0.0051387, Final residual = 0.000226864, No Iterations 14 time step continuity errors : sum local = 1.67717e08, global = 6.4155e12, cumulative = 6.21156e09 DICPCG: Solving for p_rgh, Initial residual = 0.000532194, Final residual = 9.43961e08, No Iterations 145 time step continuity errors : sum local = 6.98896e12, global = 5.56208e14, cumulative = 6.21151e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.59259e05, Final residual = 4.43109e09, No Iterations 3 bounding epsilon, min: 35.6881 max: 10019.6 average: 320.542 DILUPBiCG: Solving for k, Initial residual = 0.00429238, Final residual = 6.20346e09, No Iterations 5 ExecutionTime = 43.51 s ClockTime = 43 s Courant Number mean: 0.00170077 max: 0.510754 Interface Courant Number mean: 0 max: 0 deltaT = 8.28266e06 Time = 5.55439e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.68908e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 4.38537e30 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0144755, Final residual = 0.000649306, No Iterations 18 time step continuity errors : sum local = 4.65693e08, global = 2.10894e11, cumulative = 6.19042e09 DICPCG: Solving for p_rgh, Initial residual = 0.0030582, Final residual = 0.000147816, No Iterations 13 time step continuity errors : sum local = 1.05051e08, global = 9.01834e12, cumulative = 6.1814e09 DICPCG: Solving for p_rgh, Initial residual = 0.000317831, Final residual = 9.03361e08, No Iterations 140 time step continuity errors : sum local = 6.41349e12, global = 1.32232e13, cumulative = 6.18127e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.46021e05, Final residual = 1.10753e09, No Iterations 2 DILUPBiCG: Solving for k, Initial residual = 0.00385872, Final residual = 7.08998e09, No Iterations 3 ExecutionTime = 52.81 s ClockTime = 52 s Courant Number mean: 0.00166523 max: 0.50848 Interface Courant Number mean: 0 max: 0 deltaT = 8.14356e06 Time = 6.36875e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.73436e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.29233e29 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0101018, Final residual = 0.000428819, No Iterations 18 time step continuity errors : sum local = 2.85356e08, global = 2.1336e12, cumulative = 6.17913e09 DICPCG: Solving for p_rgh, Initial residual = 0.00196009, Final residual = 9.6592e05, No Iterations 13 time step continuity errors : sum local = 6.42842e09, global = 8.08073e12, cumulative = 6.17105e09 DICPCG: Solving for p_rgh, Initial residual = 0.00020677, Final residual = 9.61554e08, No Iterations 138 time step continuity errors : sum local = 6.40504e12, global = 1.40573e13, cumulative = 6.17119e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.35861e05, Final residual = 1.05688e09, No Iterations 2 bounding epsilon, min: 1.13847 max: 9136.01 average: 321.43 DILUPBiCG: Solving for k, Initial residual = 0.00354651, Final residual = 5.20685e09, No Iterations 3 ExecutionTime = 60.61 s ClockTime = 60 s Courant Number mean: 0.0016372 max: 0.506738 Interface Courant Number mean: 0 max: 0 deltaT = 8.0348e06 Time = 7.17223e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.28447e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 7.93829e30 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.00678436, Final residual = 0.000295459, No Iterations 17 time step continuity errors : sum local = 1.95926e08, global = 6.30779e12, cumulative = 6.1775e09 DICPCG: Solving for p_rgh, Initial residual = 0.00124079, Final residual = 6.04477e05, No Iterations 14 time step continuity errors : sum local = 3.98948e09, global = 3.47633e12, cumulative = 6.18098e09 DICPCG: Solving for p_rgh, Initial residual = 0.000133578, Final residual = 9.99504e08, No Iterations 127 time step continuity errors : sum local = 6.59323e12, global = 2.21552e14, cumulative = 6.181e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.27288e05, Final residual = 1.00723e09, No Iterations 2 DILUPBiCG: Solving for k, Initial residual = 0.00330894, Final residual = 4.07864e09, No Iterations 3 ExecutionTime = 68.02 s ClockTime = 68 s Courant Number mean: 0.00161543 max: 0.505443 Interface Courant Number mean: 0 max: 0 deltaT = 7.94783e06 Time = 7.96701e05 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.27255e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 4.56795e29 Max(alpha1) = 1 Phase volume in zone innerCylinder = 73689.4 ml DICPCG: Solving for p_rgh, Initial residual = 0.0050451, Final residual = 0.000233662, No Iterations 16 time step continuity errors : sum local = 1.46823e08, global = 4.15023e12, cumulative = 6.17685e09 DICPCG: Solving for p_rgh, Initial residual = 0.00085883, Final residual = 3.82176e05, No Iterations 16 time step continuity errors : sum local = 2.40204e09, global = 6.85582e12, cumulative = 6.16999e09 DICPCG: Solving for p_rgh, Initial residual = 9.63252e05, Final residual = 9.71377e08, No Iterations 126 time step continuity errors : sum local = 6.1099e12, global = 9.08267e14, cumulative = 6.1699e09 DILUPBiCG: Solving for epsilon, Initial residual = 2.20023e05, Final residual = 9.74754e10, No Iterations 2 DILUPBiCG: Solving for k, Initial residual = 0.00312384, Final residual = 3.44313e09, No Iterations 3 ExecutionTime = 75.58 s ClockTime = 75 s 

May 4, 2013, 23:12 

#2 
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 841
Rep Power: 18 
DyMlog
Code:
Create time Create mesh for time = 0 Selecting dynamicFvMesh solidBodyMotionFvMesh Selecting solidbody motion function rotatingMotion Applying solid body motion to cellZone innerCylinder Reading field p_rgh Reading field U Reading/calculating face flux field phi AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 1, 1.00723, 1.00001 AMI: Patch target weights min/max/average = 1, 1.00723, 1.00001 Reading transportProperties Selecting incompressible transport model Newtonian Selecting incompressible transport model Newtonian Selecting turbulence model type RASModel Selecting RAS turbulence model kEpsilon bounding k, min: 0 max: 1 average: 1 bounding epsilon, min: 0 max: 20 average: 20 kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; sigmaEps 1.3; } Reading g Calculating field g.h No finite volume options present PIMPLE: Operating solver in PISO mode time step continuity errors : sum local = 0, global = 0, cumulative = 0 GAMGPCG: Solving for pcorr, Initial residual = 0, Final residual = 0, No Iterations 0 time step continuity errors : sum local = 0, global = 0, cumulative = 0 Courant Number mean: 0 max: 0 Starting time loop Interface Courant Number mean: 0 max: 0 Courant Number mean: 0 max: 0 deltaT = 1.07991e05 Time = 1.07991e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 1.07991e05 transformation: ((0 0 0) (1 (0 0.000169632 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999981, 1.01009, 1.00001 AMI: Patch target weights min/max/average = 0.999872, 1.00789, 1.00001 Execution time for mesh.update() = 0.57 s time step continuity errors : sum local = 0, global = 0, cumulative = 0 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 5.85724e05, No Iterations 6 time step continuity errors : sum local = 1.1423e15, global = 2.09364e16, cumulative = 2.09364e16 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 1, Final residual = 0.0465405, No Iterations 2 time step continuity errors : sum local = 1.57011e06, global = 1.87009e08, cumulative = 1.87009e08 GAMG: Solving for p_rgh, Initial residual = 0.0789648, Final residual = 0.00246715, No Iterations 2 time step continuity errors : sum local = 2.88529e07, global = 6.79494e10, cumulative = 1.93804e08 GAMGPCG: Solving for p_rgh, Initial residual = 0.0106098, Final residual = 4.05951e09, No Iterations 9 time step continuity errors : sum local = 4.86709e13, global = 1.19577e14, cumulative = 1.93804e08 DILUPBiCG: Solving for epsilon, Initial residual = 0.000141365, Final residual = 9.72214e07, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 9.04443e07, No Iterations 4 ExecutionTime = 11.88 s ClockTime = 12 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.00219444 max: 0.530883 deltaT = 1.01693e05 Time = 2.09684e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 2.09684e05 transformation: ((0 0 0) (1 (0 0.000329371 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999903, 1.0128, 1.00002 AMI: Patch target weights min/max/average = 0.999753, 1.00851, 1.00002 Execution time for mesh.update() = 0.73 s time step continuity errors : sum local = 4.58334e13, global = 1.10632e14, cumulative = 1.93804e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 1.85074e05, No Iterations 6 time step continuity errors : sum local = 1.04091e15, global = 3.97154e17, cumulative = 1.93804e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.40366e31 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.40366e31 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.111485, Final residual = 0.00298827, No Iterations 4 time step continuity errors : sum local = 1.87951e07, global = 8.61162e10, cumulative = 1.85192e08 GAMG: Solving for p_rgh, Initial residual = 0.0806247, Final residual = 0.0016671, No Iterations 2 time step continuity errors : sum local = 9.60968e08, global = 1.21665e09, cumulative = 1.73026e08 GAMGPCG: Solving for p_rgh, Initial residual = 0.00729125, Final residual = 2.44918e09, No Iterations 9 time step continuity errors : sum local = 1.22663e13, global = 7.78887e15, cumulative = 1.73026e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.26066e05, Final residual = 6.98713e08, No Iterations 1 bounding epsilon, min: 2.33489 max: 12270 average: 318.304 DILUPBiCG: Solving for k, Initial residual = 0.00893094, Final residual = 1.52782e06, No Iterations 2 ExecutionTime = 22.12 s ClockTime = 22 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.00206649 max: 0.471772 deltaT = 1.07761e05 Time = 3.17445e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 3.17445e05 transformation: ((0 0 0) (1 (0 0.000498641 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999807, 1.01565, 1.00003 AMI: Patch target weights min/max/average = 0.999626, 1.00917, 1.00003 Execution time for mesh.update() = 0.83 s time step continuity errors : sum local = 1.30033e13, global = 8.21103e15, cumulative = 1.73026e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 2.08231e05, No Iterations 5 time step continuity errors : sum local = 1.14651e15, global = 1.625e16, cumulative = 1.73026e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.12177e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 4.14319e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.00275e30 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.00924303, Final residual = 0.000183372, No Iterations 2 time step continuity errors : sum local = 2.01927e08, global = 3.82154e11, cumulative = 1.72644e08 GAMG: Solving for p_rgh, Initial residual = 0.0010327, Final residual = 4.32465e05, No Iterations 2 time step continuity errors : sum local = 4.73384e09, global = 1.00248e10, cumulative = 1.71641e08 GAMGPCG: Solving for p_rgh, Initial residual = 0.000160943, Final residual = 6.14766e09, No Iterations 6 time step continuity errors : sum local = 6.76895e13, global = 2.3289e14, cumulative = 1.71641e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.28376e05, Final residual = 7.18948e08, No Iterations 1 bounding epsilon, min: 25.3986 max: 11277.1 average: 318.745 DILUPBiCG: Solving for k, Initial residual = 0.00691905, Final residual = 1.49221e06, No Iterations 2 ExecutionTime = 30.31 s ClockTime = 30 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.0021898 max: 0.476022 deltaT = 1.13173e05 Time = 4.30618e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 4.30618e05 transformation: ((0 0 0) (1 (0 0.000676413 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999706, 1.01864, 1.00004 AMI: Patch target weights min/max/average = 0.999492, 1.00987, 1.00003 Execution time for mesh.update() = 0.77 s time step continuity errors : sum local = 7.10885e13, global = 2.4288e14, cumulative = 1.71641e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 7.44623e05, No Iterations 5 time step continuity errors : sum local = 1.1549e15, global = 7.19047e17, cumulative = 1.71641e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 7.97699e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.53358e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.10898e30 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.00313902, Final residual = 4.86501e05, No Iterations 2 time step continuity errors : sum local = 6.11297e09, global = 2.00984e11, cumulative = 1.71842e08 GAMG: Solving for p_rgh, Initial residual = 0.000415594, Final residual = 1.11061e05, No Iterations 2 time step continuity errors : sum local = 1.39186e09, global = 3.24225e13, cumulative = 1.71845e08 GAMGPCG: Solving for p_rgh, Initial residual = 5.9657e05, Final residual = 7.36493e09, No Iterations 5 time step continuity errors : sum local = 9.22573e13, global = 5.22275e14, cumulative = 1.71846e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.31122e05, Final residual = 7.37862e08, No Iterations 1 bounding epsilon, min: 17.1488 max: 10497.8 average: 319.131 DILUPBiCG: Solving for k, Initial residual = 0.00581176, Final residual = 1.37789e06, No Iterations 2 ExecutionTime = 39.07 s ClockTime = 39 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.0022998 max: 0.481042 deltaT = 1.17617e05 Time = 5.48235e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 5.48235e05 transformation: ((0 0 0) (1 (0 0.000861165 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999602, 1.02174, 1.00005 AMI: Patch target weights min/max/average = 0.999354, 1.0106, 1.00004 Execution time for mesh.update() = 0.81 s time step continuity errors : sum local = 9.58819e13, global = 5.42002e14, cumulative = 1.71846e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 1.96255e05, No Iterations 6 time step continuity errors : sum local = 1.14831e15, global = 7.02381e17, cumulative = 1.71846e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 5.85705e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.53586e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.25193e29 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.00171074, Final residual = 2.69953e05, No Iterations 2 time step continuity errors : sum local = 3.65318e09, global = 1.63339e11, cumulative = 1.71683e08 GAMG: Solving for p_rgh, Initial residual = 0.000266381, Final residual = 6.07096e06, No Iterations 2 time step continuity errors : sum local = 8.20523e10, global = 1.05994e12, cumulative = 1.71693e08 GAMGPCG: Solving for p_rgh, Initial residual = 3.85518e05, Final residual = 3.00878e09, No Iterations 5 time step continuity errors : sum local = 4.06444e13, global = 2.41697e14, cumulative = 1.71693e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.31698e05, Final residual = 7.43642e08, No Iterations 1 bounding epsilon, min: 14.0313 max: 9872.48 average: 319.451 DILUPBiCG: Solving for k, Initial residual = 0.00509662, Final residual = 1.40194e06, No Iterations 2 ExecutionTime = 47.4 s ClockTime = 47 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.0023901 max: 0.484863 deltaT = 1.21285e05 Time = 6.69519e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 6.69519e05 transformation: ((0 0 0) (0.999999 (0 0.00105168 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.999497, 1.02491, 1.00006 AMI: Patch target weights min/max/average = 0.999212, 1.01135, 1.00005 Execution time for mesh.update() = 0.76 s time step continuity errors : sum local = 4.19134e13, global = 2.48519e14, cumulative = 1.71693e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 3.53546e05, No Iterations 5 time step continuity errors : sum local = 1.04974e15, global = 6.00047e17, cumulative = 1.71693e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 6.68026e30 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.23842e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 2.32055e29 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.00112309, Final residual = 1.93869e05, No Iterations 2 time step continuity errors : sum local = 2.77824e09, global = 5.02977e12, cumulative = 1.71743e08 GAMG: Solving for p_rgh, Initial residual = 0.000201329, Final residual = 4.32628e06, No Iterations 2 time step continuity errors : sum local = 6.19553e10, global = 4.85506e12, cumulative = 1.71792e08 GAMGPCG: Solving for p_rgh, Initial residual = 2.98488e05, Final residual = 4.46162e09, No Iterations 5 time step continuity errors : sum local = 6.38652e13, global = 3.95783e14, cumulative = 1.71791e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.3014e05, Final residual = 7.2015e08, No Iterations 1 bounding epsilon, min: 4.3537 max: 9380.48 average: 319.728 DILUPBiCG: Solving for k, Initial residual = 0.00459607, Final residual = 1.00059e06, No Iterations 2 ExecutionTime = 55.51 s ClockTime = 55 s Interface Courant Number mean: 0 max: 0 Courant Number mean: 0.00246466 max: 0.487793 deltaT = 1.24307e05 Time = 7.93826e05 solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 7.93826e05 transformation: ((0 0 0) (0.999999 (0 0.00124694 0))) AMI: Creating addressing and weights between 6660 source faces and 6660 target faces AMI: Patch source weights min/max/average = 0.99939, 1.02815, 1.00006 AMI: Patch target weights min/max/average = 0.999066, 1.01213, 1.00005 Execution time for mesh.update() = 0.73 s time step continuity errors : sum local = 6.54573e13, global = 4.05042e14, cumulative = 1.71791e08 GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 3.58974e05, No Iterations 6 time step continuity errors : sum local = 1.04694e15, global = 5.07291e17, cumulative = 1.71791e08 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 5.06817e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 3.68502e29 Max(alpha1) = 1 MULES: Solving for alpha1 Phase1 volume fraction = 0.801613 Min(alpha1) = 1.12484e28 Max(alpha1) = 1 GAMG: Solving for p_rgh, Initial residual = 0.000809561, Final residual = 1.5265e05, No Iterations 2 time step continuity errors : sum local = 2.29045e09, global = 2.31451e12, cumulative = 1.71814e08 GAMG: Solving for p_rgh, Initial residual = 0.000162648, Final residual = 3.58839e06, No Iterations 2 time step continuity errors : sum local = 5.38243e10, global = 4.18246e12, cumulative = 1.71856e08 GAMGPCG: Solving for p_rgh, Initial residual = 2.49227e05, Final residual = 3.39738e09, No Iterations 5 time step continuity errors : sum local = 5.094e13, global = 3.44719e14, cumulative = 1.71856e08 DILUPBiCG: Solving for epsilon, Initial residual = 3.27583e05, Final residual = 6.98992e08, No Iterations 1 bounding epsilon, min: 3.47421 max: 8996.31 average: 319.978 DILUPBiCG: Solving for k, Initial residual = 0.00422555, Final residual = 1.25871e06, No Iterations 2 ExecutionTime = 64.44 s ClockTime = 64 s 

May 5, 2013, 07:59 

#3 
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Greetings sharonyue,
I'm not very experienced on this topic, but I do have a few of questions/comments:
Bruno
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May 5, 2013, 09:33 

#4  
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Dongyue Li
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Quote:
I have read lots of your post,Thats very helpful.Thanks for sharing your CFD experience. Regarding to my case. [*]Which OpenFOAM version are you using? I am using 220 [*]Are you running both in parallel? If so, which decomposition method was used? Yes, I am using simple method in my laptop just for a test. [*]Why is the MRF version referring to AMI? Do the tutorials for MRFInterFoam also refer to AMI in their output? Actually,in MRF, I dont need AMI,but if I want to run the same case in sliding mesh and MRF. I have to use two meshes. While in MRFInterFoam, I can use the mesh with AMI, so I dont need to make another mesh for dynamic solver. [*]Of the 200 million cells, how many cells are moving? In sliding mesh, There are 2127678 cells.Total cell is 2162754. [*]Are you certain that the same volume of fluid is filled on both cases? Yeah,of course,I use the same setFieldsDict. [*]Are there any cyclic patches, symmetry planes and so on? Nope, The majority of em are walls,impeller,Only one outlet. [*]This seems to be too early in the simulation to diagnose which one is fastest... Um...Perhaps I should try it another day for a long runing..? In my laptop, it took about 8 hours calculating 0.08 seconds. 

May 5, 2013, 10:47 

#5  
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Hi sharonyue,
Quote:
Quote:
Quote:
Roughly 1 or 2 hours each should be more than enough, I guess. But first you better reconfigure the MRF case to not rely on AMI at all, if possible! Best regards, Bruno
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May 5, 2013, 19:28 

#6  
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Dongyue Li
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Quote:
Quote:
Is there anything different between this two situation?I regard the result is independent with the rotating cells number. Quote:
Thank you very much.This do me a lot favor~. Regards. 

May 6, 2013, 17:38 

#7  
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Hi sharonyue,
Quote:
For example (all theory here, I have not checked the code!), here's an abstract concept:
If this theory is correct, then there is only one (or a few) remaining explanations as to why AMI was not used in the past: memory! AMI might require a lot more memory than MRF to run. Or perhaps because the algorithm for AMI is a lot more complex... or harder to calibrate... overlapping cells/faces can also be a pain... Best regards, Bruno
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May 6, 2013, 20:24 

#8  
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Dongyue Li
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Quote:
Anyway,this mesh is without AMI.I will try the same mesh with AMI and make a speed test another day.oh my laptop its a pity.. Thanks Bruno. You did a splendid job regarding CFD. BTW, do you have a blog or something? Regards. 

May 7, 2013, 17:34 

#9 
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Hi sharonyue,
Here's an interesting read about MRF: http://www.esicfd.com/faq/index.php...=19&artlang=en My expertise are in installing OpenFOAM When it comes to CFD, I only know some stuff on the topic The first link in my first signature points to a post to the only blog I've got. Other than that, I've got twitter: @wyldckat Best regards, Bruno
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May 7, 2013, 22:58 

#10  
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Dongyue Li
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Quote:
Regards 

August 22, 2013, 14:33 

#11 
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hi sharonyue,
this topic seems to be same as what i'm doing now. I have done the simulation for centrifugal fan 3D using simpleFoam with mrfZone and it works well. I would like to try this simulation using pimpleDyMFoam which requires me to have AMI. Have you done the one using AMI?? If yes how did you define the AMI? using MRF?? I have read threads regarding the AMI and also the propeller tutorial. In snappyHexMesh there are already faceZone and cellZone being created. Why there is a need to define that again using toposetDict. I hope someone could help me to have a better understanding in continuing my project using pimpleDyMFoam. Btw the simulation using simpleFoam MRF took me a day to be completed using 12 processors (including sHM: cells generated almost 8 000 000) With the assumption from wyldckat that one using pimpleFoam could reduce the time, i would really like to try it and to confirm it.. 

August 22, 2013, 17:21 

#12 
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Greetings nash,
Some of the details on this topic are available in this thread: http://www.cfdonline.com/Forums/ope...tml#post446517 namely start reading from post #184 Keep in mind that simpleFoam with MRF gives you a steadystate result. In theory, it should be faster than using pimpleDyMFoam, because this latter solver provides a transient solution with dynamic mesh, which should be several times slower to perform. The comparable differences in wall clock time is only if you compare pimpleFoam+MRF vs pimpleDyMFoam+AMI, because both are transient solvers. And keep in mind that MRF is by definition meant for steadystate (I learned this recently), so be very careful when using MRF in transient simulations. Last but not least:
Bruno
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August 23, 2013, 05:31 

#13  
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thanks Bruno for the explaination.
here is some information i get from the link posted by you: Quote:
Lets say if i want to make the mesh move, i need to use AMI+transient solver which will lead to large simulation time as you mentioned above. Maybe i can run the simulation using transient solver pimpleFoam and compare it with MRFsimpleFoam ( just to confirm the statement from the esi website) Do you have any idea which solver i could also use to simulate this fan (rotor and stator)? Ideas from other foamers are also welcomed thanks 

August 24, 2013, 19:21 

#14  
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Hi nash,
I was following nicely your post until this question: Quote:
Without knowing more about the case in question, it's complicated to suggest anything else. Best regards, Bruno
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August 26, 2013, 07:47 

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In the log files in the first post it can be seen that different solvers are used (DICPCG and GAMG / GAMGPCG). Make sure the solution control is the same for comparison to be valid.
Best regards 

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