decompose dependent solution
 

Hi, im trying to solve a dynamic mesh with AMI similar to the propeller tutorial. The simulation works fine with 8 cores n=(2 2 2) but fails with 48 cores. The 48 core simulation works better if n=(24 2 1) than (4 3 4) but fails anyway. Here is the end of log:

PIMPLE: Iteration 1
AMI: Creating addressing and weights between 23228 source faces and 17352 target faces
AMI: Patch source sum(weights) min/max/average = 0.640126, 2.02482, 1.00383
AMI: Patch target sum(weights) min/max/average = 0.00764601, 1.60293, 1.0027
smoothSolver: Solving for Ux, Initial residual = 0.00314316, Final residual = 0.000161422, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.00336032, Final residual = 0.000150761, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.00311104, Final residual = 0.000151876, No Iterations 1
GAMG: Solving for p, Initial residual = 0.237415, Final residual = 0.00205794, No Iterations 4
GAMG: Solving for p, Initial residual = 0.0215434, Final residual = 0.000177966, No Iterations 5
time step continuity errors : sum local = 4.00436e-07, global = 1.55868e-07, cumulative = 8.40485e-07
GAMG: Solving for p, Initial residual = 0.066189, Final residual = 0.00057829, No Iterations 3
GAMG: Solving for p, Initial residual = 0.00649573, Final residual = 3.07504e-05, No Iterations 7
time step continuity errors : sum local = 7.23223e-08, global = 1.27801e-08, cumulative = 8.53265e-07
GAMG: Solving for p, Initial residual = 0.0564967, Final residual = 0.00054468, No Iterations 3
GAMG: Solving for p, Initial residual = 0.00612875, Final residual = 6.4775e-07, No Iterations 17
time step continuity errors : sum local = 1.5343e-09, global = 5.26857e-10, cumulative = 8.53792e-07
smoothSolver: Solving for omega, Initial residual = 0.000311639, Final residual = 1.43584e-05, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.000780975, Final residual = 4.56978e-05, No Iterations 1
PIMPLE: Iteration 2
smoothSolver: Solving for Ux, Initial residual = 0.00162772, Final residual = 8.84785e-05, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.00156759, Final residual = 8.06781e-05, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.00162965, Final residual = 8.5398e-05, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0524565, Final residual = 0.000495011, No Iterations 4
GAMG: Solving for p, Initial residual = 0.0115723, Final residual = 0.000110676, No Iterations 5
time step continuity errors : sum local = 2.13065e-07, global = -6.79215e-08, cumulative = 7.8587e-07
GAMG: Solving for p, Initial residual = 0.0228772, Final residual = 0.000101613, No Iterations 5
GAMG: Solving for p, Initial residual = 0.00414592, Final residual = 4.12058e-05, No Iterations 4
time step continuity errors : sum local = 7.76397e-08, global = -2.81646e-08, cumulative = 7.57705e-07
GAMG: Solving for p, Initial residual = 0.0198464, Final residual = 0.000194728, No Iterations 4
GAMG: Solving for p, Initial residual = 0.00385169, Final residual = 8.67885e-07, No Iterations 16
time step continuity errors : sum local = 1.63919e-09, global = -3.63495e-10, cumulative = 7.57342e-07
smoothSolver: Solving for omega, Initial residual = 0.000124945, Final residual = 6.16685e-06, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.000327625, Final residual = 1.99492e-05, No Iterations 1
PIMPLE: Iteration 3
smoothSolver: Solving for Ux, Initial residual = 0.00045945, Final residual = 2.53229e-05, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.000640314, Final residual = 2.86446e-05, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.000455598, Final residual = 2.39908e-05, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0255996, Final residual = 0.000100523, No Iterations 6
GAMG: Solving for p, Initial residual = 0.0082641, Final residual = 3.09009e-05, No Iterations 4
time step continuity errors : sum local = 5.45629e-08, global = -1.7299e-08, cumulative = 7.40043e-07
GAMG: Solving for p, Initial residual = 0.0109177, Final residual = 9.58104e-05, No Iterations 4
GAMG: Solving for p, Initial residual = 0.00272103, Final residual = 1.16692e-05, No Iterations 4
time step continuity errors : sum local = 2.05735e-08, global = -4.27736e-09, cumulative = 7.35766e-07
GAMG: Solving for p, Initial residual = 0.00946239, Final residual = 7.99641e-05, No Iterations 5
GAMG: Solving for p, Initial residual = 0.00267032, Final residual = 4.94202e-07, No Iterations 11
time step continuity errors : sum local = 8.68681e-10, global = -1.15411e-10, cumulative = 7.3565e-07
smoothSolver: Solving for omega, Initial residual = 5.18854e-05, Final residual = 2.73978e-06, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.000140115, Final residual = 8.89688e-06, No Iterations 1
PIMPLE: Iteration 4
smoothSolver: Solving for Ux, Initial residual = 0.000125401, Final residual = 7.06938e-06, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.000478161, Final residual = 2.31364e-05, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.000125401, Final residual = 7.60537e-06, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0104569, Final residual = 7.24393e-05, No Iterations 4
GAMG: Solving for p, Initial residual = 0.00217912, Final residual = 1.04679e-05, No Iterations 4
time step continuity errors : sum local = 1.86154e-08, global = -5.8645e-09, cumulative = 7.29786e-07
GAMG: Solving for p, Initial residual = 0.00436904, Final residual = 1.98028e-05, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000754537, Final residual = 4.36505e-06, No Iterations 3
time step continuity errors : sum local = 7.75789e-09, global = 4.332e-10, cumulative = 7.30219e-07
GAMG: Solving for p, Initial residual = 0.00374923, Final residual = 2.00379e-05, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000705467, Final residual = 6.62802e-07, No Iterations 7
time step continuity errors : sum local = 1.17908e-09, global = -3.78833e-10, cumulative = 7.2984e-07
smoothSolver: Solving for omega, Initial residual = 2.24531e-05, Final residual = 1.25385e-06, No Iterations 1
smoothSolver: Solving for k, Initial residual = 6.10787e-05, Final residual = 4.03104e-06, No Iterations 1
PIMPLE: Iteration 5
smoothSolver: Solving for Ux, Initial residual = 7.17316e-05, Final residual = 4.35357e-06, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.000222978, Final residual = 1.23042e-05, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 7.08052e-05, Final residual = 4.56745e-06, No Iterations 1
GAMG: Solving for p, Initial residual = 0.00390302, Final residual = 3.13145e-05, No Iterations 3
GAMG: Solving for p, Initial residual = 0.000409693, Final residual = 8.55303e-06, No Iterations 3
time step continuity errors : sum local = 1.53258e-08, global = 3.93791e-09, cumulative = 7.33778e-07
GAMG: Solving for p, Initial residual = 0.00171579, Final residual = 7.02324e-06, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000181272, Final residual = 8.61135e-06, No Iterations 1
time step continuity errors : sum local = 1.54803e-08, global = 6.64287e-09, cumulative = 7.40421e-07
GAMG: Solving for p, Initial residual = 0.00144378, Final residual = 6.86926e-06, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000162935, Final residual = 5.52017e-07, No Iterations 7
time step continuity errors : sum local = 9.92553e-10, global = 4.32425e-10, cumulative = 7.40853e-07
smoothSolver: Solving for omega, Initial residual = 1.02472e-05, Final residual = 5.91612e-07, No Iterations 1
smoothSolver: Solving for k, Initial residual = 2.72085e-05, Final residual = 1.85781e-06, No Iterations 1
PIMPLE: Iteration 6
smoothSolver: Solving for Ux, Initial residual = 2.65473e-05, Final residual = 1.69321e-06, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 6.88e-05, Final residual = 4.54147e-06, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 2.62085e-05, Final residual = 1.77625e-06, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0017311, Final residual = 8.74477e-06, No Iterations 5
GAMG: Solving for p, Initial residual = 0.000357266, Final residual = 4.89035e-06, No Iterations 3
time step continuity errors : sum local = 8.82443e-09, global = 3.3515e-09, cumulative = 7.44205e-07
GAMG: Solving for p, Initial residual = 0.000761454, Final residual = 9.82832e-06, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000133049, Final residual = 7.91594e-06, No Iterations 1
time step continuity errors : sum local = 1.42964e-08, global = 4.17428e-09, cumulative = 7.48379e-07
GAMG: Solving for p, Initial residual = 0.000644368, Final residual = 8.84289e-06, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000126339, Final residual = 9.66247e-07, No Iterations 5
time step continuity errors : sum local = 1.74511e-09, global = 7.31198e-10, cumulative = 7.4911e-07
smoothSolver: Solving for omega, Initial residual = 4.97623e-06, Final residual = 2.86261e-07, No Iterations 1
smoothSolver: Solving for k, Initial residual = 1.24484e-05, Final residual = 8.72288e-07, No Iterations 1
PIMPLE: Iteration 7
smoothSolver: Solving for Ux, Initial residual = 8.38714e-06, Final residual = 5.55043e-07, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 3.02269e-05, Final residual = 1.62476e-06, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 8.45018e-06, Final residual = 6.00375e-07, No Iterations 1
GAMG: Solving for p, Initial residual = 0.000741519, Final residual = 3.80987e-06, No Iterations 5
GAMG: Solving for p, Initial residual = 0.000143734, Final residual = 8.36365e-06, No Iterations 1
time step continuity errors : sum local = 1.51125e-08, global = 2.89613e-09, cumulative = 7.52006e-07
GAMG: Solving for p, Initial residual = 0.000328853, Final residual = 7.51672e-06, No Iterations 2
GAMG: Solving for p, Initial residual = 5.23058e-05, Final residual = 6.16932e-06, No Iterations 1
time step continuity errors : sum local = 1.11445e-08, global = 1.51966e-09, cumulative = 7.53526e-07
GAMG: Solving for p, Initial residual = 0.000281089, Final residual = 7.02204e-06, No Iterations 2
GAMG: Solving for p, Initial residual = 4.92908e-05, Final residual = 4.39403e-07, No Iterations 7
time step continuity errors : sum local = 7.93722e-10, global = 1.68259e-10, cumulative = 7.53694e-07
smoothSolver: Solving for omega, Initial residual = 2.82637e-06, Final residual = 1.47576e-07, No Iterations 1
smoothSolver: Solving for k, Initial residual = 5.99283e-06, Final residual = 4.22433e-07, No Iterations 1
PIMPLE: Iteration 8
smoothSolver: Solving for Ux, Initial residual = 6.61349e-06, Final residual = 7.97449e-07, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 2.229e-05, Final residual = 3.01211e-07, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 6.64923e-06, Final residual = 8.21615e-07, No Iterations 1
GAMG: Solving for p, Initial residual = 0.155916, Final residual = 0.00105258, No Iterations 2
GAMG: Solving for p, Initial residual = 0.00890627, Final residual = 7.44728e-05, No Iterations 3
time step continuity errors : sum local = 1.63909e-07, global = -2.67794e-08, cumulative = 7.26915e-07
GAMG: Solving for p, Initial residual = 0.0401865, Final residual = 0.000183517, No Iterations 2
GAMG: Solving for p, Initial residual = 0.00172845, Final residual = 1.08675e-05, No Iterations 4
time step continuity errors : sum local = 2.24388e-08, global = -9.16245e-09, cumulative = 7.17752e-07
GAMG: Solving for p, Initial residual = 0.0135472, Final residual = 4.87362e-05, No Iterations 2
GAMG: Solving for p, Initial residual = 0.000630845, Final residual = 7.14904e-07, No Iterations 9
time step continuity errors : sum local = 1.44197e-09, global = -4.89227e-10, cumulative = 7.17263e-07
smoothSolver: Solving for omega, Initial residual = 1.91752e-05, Final residual = 1.05424e-07, No Iterations 2
smoothSolver: Solving for k, Initial residual = 2.97993e-05, Final residual = 2.37212e-07, No Iterations 2
ExecutionTime = 141.79 s ClockTime = 145 s

forces forces write:
sum of forces:
pressure : (-0.0147785 2.259 -0.0435249)
viscous : (-0.00239986 0.000924774 0.00203156)
porous : (0 0 0)
sum of moments:
pressure : (-0.000257647 -0.0349593 -0.00154703)
viscous : (3.86898e-05 -0.00114474 -5.58975e-05)
porous : (0 0 0)

Courant Number mean: 0.13151 max: 4.97833
deltaT = 0.000143081
Time = 0.2255645

PIMPLE: Iteration 1
AMI: Creating addressing and weights between 23228 source faces and 17352 target faces
AMI: Patch source sum(weights) min/max/average = 0.652674, 2.13182, 1.00375
AMI: Patch target sum(weights) min/max/average = 0, 1.68866, 1.00261
smoothSolver: Solving for Ux, Initial residual = 0.00314458, Final residual = 0.000161758, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.00324429, Final residual = 0.000149037, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.00310572, Final residual = 0.000151366, No Iterations 1
[11] #0 Foam::error::printStack(Foam::Ostream&) at ??:?
[11] #1 Foam::sigFpe::sigHandler(int) at ??:?
[11] #2 ? in "/usr/lib64/libc.so.6"
[11] #3 Foam::divide(Foam::Field<double>&, double const&, Foam::UList<double> const&) at ??:?
[11] #4 Foam::tmp<Foam::GeometricField<double, Foam::volMesh> > Foam::operator/<Foam::fvPatchField, Foam::volMesh>(Foam::dimensioned<double> const&, Foam::tmp<Foam::GeometricField<double, Foam::volMesh> > const&) at ??:?
[11] #5 Foam::tmp<Foam::GeometricField<double, Foam::volMesh> > Foam::operator/<Foam::fvPatchField, Foam::volMesh>(double const&, Foam::tmp<Foam::GeometricField<double, Foam::volMesh> > const&) at ??:?
[11] #6 ? at ??:?
[11] #7 __libc_start_main in "/usr/lib64/libc.so.6"
[11] #8 ? at ??:?

================================================== =================================
= BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
= PID 9823 RUNNING AT s12p29
= EXIT CODE: 8
= CLEANING UP REMAINING PROCESSES
= YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
================================================== =================================
Intel(R) MPI Library troubleshooting guide:
https://software.intel.com/node/561764
================================================== =================================



The mesh is Ok. I ran checkMesh with no errors.

I have two suggestions. First I would try to improve the match between rotating and non-rotating surfaces, because this could be better:

AMI simulations I have done before had problems with such low minimum and high maximum weights, although average values seem ok. So try to improve interface matching (surfaces and/or mesh).

Secondly, there is an option to keep AMI patches intact when running decomposePar. You will need to create faceSets out of cyclicAMI patches to do this and then use the created faceSets with singleProcessorFaceSets in decomposeParDict. See example in caseDicts file:

https://github.com/OpenFOAM/OpenFOAM...composeParDict

I don't exactly why the case is running with less decomposition, but I suspect that when you split it further, some of the bad AMI weights gets distributed in a numerically unstable way and it crashes.

how can i improve the interface matching?!

Well that is hard to say when I don't know anything about your case or mesh..

In general, make sure that the rotational surfaces match as closely as possibly in geometry (use good quality .stl etc). Then try increasing mesh density on the interface, I also found out that using one boundary layer in snappyHexMesh (even with same cell size as inner mesh) makes the mesh more conforming because it extrudes from the rotational surfaces. Also make sure that edges are properly snapped.