[ghadab]

Dear friends,

i am working with the interFoam solver and running the simulation on 24 processors. After two days of calculation one of the processors blows up. If i read the log before the error, i see that the simulation was stable (maxco, residuals, time step, ...). I copied for you the last lines of the logfile.

MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216176 Min(alpha1) = -5.5510116e-20 Max(alpha1) = 1.0000333
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216177 Min(alpha1) = -1.5739172e-19 Max(alpha1) = 1.0000347
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216178 Min(alpha1) = -2.0048211e-19 Max(alpha1) = 1.0000359
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216179 Min(alpha1) = -1.6316185e-19 Max(alpha1) = 1.000037
GAMG: Solving for p_rgh, Initial residual = 0.00055114557, Final residual = 7.5653985e-06, No Iterations 2
GAMG: Solving for p_rgh, Initial residual = 8.8321274e-05, Final residual = 6.1051387e-06, No Iterations 1
time step continuity errors : sum local = 4.5327434e-10, global = -5.4431254e-12, cumulative = -0.00078028933
GAMG: Solving for p_rgh, Initial residual = 0.00016425054, Final residual = 4.5803235e-06, No Iterations 2
GAMGPCG: Solving for p_rgh, Initial residual = 5.0422281e-05, Final residual = 1.520426e-06, No Iterations 1
time step continuity errors : sum local = 1.1287501e-10, global = 1.3621927e-13, cumulative = -0.00078028933
DILUPBiCG: Solving for k, Initial residual = 0.00023313691, Final residual = 8.5579005e-09, No Iterations 3
bounding k, min: -1.2733491e-05 max: 4.7929403 average: 0.042688034
ExecutionTime = 232572.69 s ClockTime = 233069 s

Courant Number mean: 0.011293328 max: 0.50499715
Interface Courant Number mean: 0.00034175293 max: 0.13210925
deltaT = 8.5249158e-06
Time = 1.25438208

MULES: Solving for alpha1
Phase-1 volume fraction = 0.9321618 Min(alpha1) = -1.7904223e-19 Max(alpha1) = 1.0000387
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216181 Min(alpha1) = -7.3661288e-20 Max(alpha1) = 1.0000406
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216183 Min(alpha1) = -3.8216149e-20 Max(alpha1) = 1.0000422
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216184 Min(alpha1) = -8.0706645e-20 Max(alpha1) = 1.0000437
GAMG: Solving for p_rgh, Initial residual = 0.00072098495, Final residual = 8.618023e-06, No Iterations 2
GAMG: Solving for p_rgh, Initial residual = 0.00010279397, Final residual = 6.9378374e-06, No Iterations 1
time step continuity errors : sum local = 5.0463324e-10, global = 1.4211672e-12, cumulative = -0.00078028932
GAMG: Solving for p_rgh, Initial residual = 0.00016345643, Final residual = 4.7007859e-06, No Iterations 2
GAMGPCG: Solving for p_rgh, Initial residual = 5.0320654e-05, Final residual = 1.5890004e-06, No Iterations 1
time step continuity errors : sum local = 1.1557738e-10, global = -6.230831e-13, cumulative = -0.00078028933
DILUPBiCG: Solving for k, Initial residual = 0.00023066785, Final residual = 6.6803586e-09, No Iterations 3
bounding k, min: -9.637777e-05 max: 4.9497763 average: 0.042689423
ExecutionTime = 232574.05 s ClockTime = 233071 s

Courant Number mean: 0.011173537 max: 0.50453059
Interface Courant Number mean: 0.00033831272 max: 0.13069177
deltaT = 8.4479993e-06
Time = 1.25439053

MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216185 Min(alpha1) = -1.5646013e-19 Max(alpha1) = 1.0000451
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216186 Min(alpha1) = -8.945875e-20 Max(alpha1) = 1.0000463
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216187 Min(alpha1) = -2.122793e-19 Max(alpha1) = 1.0000474
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216189 Min(alpha1) = -1.8830937e-19 Max(alpha1) = 1.0000485
GAMG: Solving for p_rgh, Initial residual = 0.00067100595, Final residual = 8.5266915e-06, No Iterations 2
GAMG: Solving for p_rgh, Initial residual = 9.7152886e-05, Final residual = 6.6805452e-06, No Iterations 1
time step continuity errors : sum local = 4.7779724e-10, global = -1.6421516e-12, cumulative = -0.00078028933
GAMG: Solving for p_rgh, Initial residual = 0.00016094755, Final residual = 4.6225229e-06, No Iterations 2
GAMGPCG: Solving for p_rgh, Initial residual = 4.9303045e-05, Final residual = 1.5754646e-06, No Iterations 1
time step continuity errors : sum local = 1.1267799e-10, global = 2.7460826e-13, cumulative = -0.00078028933
DILUPBiCG: Solving for k, Initial residual = 0.00022857712, Final residual = 5.4361084e-09, No Iterations 3
bounding k, min: -0.00070291813 max: 5.1064455 average: 0.042690956
ExecutionTime = 232575.42 s ClockTime = 233072 s

Courant Number mean: 0.011072711 max: 0.50475466
Interface Courant Number mean: 0.00033544306 max: 0.12948992
deltaT = 8.3598681e-06
Time = 1.25439889

MULES: Solving for alpha1
Phase-1 volume fraction = 0.9321619 Min(alpha1) = -7.8526875e-20 Max(alpha1) = 1.0000496
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216191 Min(alpha1) = -1.0447194e-19 Max(alpha1) = 1.0000507
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216192 Min(alpha1) = -8.0890711e-20 Max(alpha1) = 1.0000516
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216193 Min(alpha1) = -2.1416833e-19 Max(alpha1) = 1.0000525
GAMG: Solving for p_rgh, Initial residual = 0.00067214463, Final residual = 8.3396353e-06, No Iterations 2
GAMG: Solving for p_rgh, Initial residual = 9.3977145e-05, Final residual = 6.43286e-06, No Iterations 1
time step continuity errors : sum local = 4.5116681e-10, global = -1.6635553e-12, cumulative = -0.00078028933
GAMG: Solving for p_rgh, Initial residual = 0.00015785756, Final residual = 4.5155882e-06, No Iterations 2
GAMGPCG: Solving for p_rgh, Initial residual = 4.8203437e-05, Final residual = 1.5168408e-06, No Iterations 1
time step continuity errors : sum local = 1.0638073e-10, global = 2.1630499e-13, cumulative = -0.00078028933
DILUPBiCG: Solving for k, Initial residual = 0.00022623408, Final residual = 3.8751548e-09, No Iterations 3
bounding k, min: -0.018329866 max: 5.2509637 average: 0.042692732
ExecutionTime = 232576.78 s ClockTime = 233073 s

Courant Number mean: 0.010957187 max: 0.50412939
Interface Courant Number mean: 0.00033184779 max: 0.12811218
deltaT = 8.2856681e-06
Time = 1.25440717

MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216194 Min(alpha1) = -6.9553818e-20 Max(alpha1) = 1.0000535
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216195 Min(alpha1) = -1.49288e-19 Max(alpha1) = 1.0000544
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216197 Min(alpha1) = -8.8329747e-20 Max(alpha1) = 1.0000552
MULES: Solving for alpha1
Phase-1 volume fraction = 0.93216198 Min(alpha1) = -1.8334624e-19 Max(alpha1) = 1.000056
GAMG: Solving for p_rgh, Initial residual = 0.00062626096, Final residual = 8.1036593e-06, No Iterations 2
GAMG: Solving for p_rgh, Initial residual = 8.8361519e-05, Final residual = 6.1779555e-06, No Iterations 1
time step continuity errors : sum local = 4.2607103e-10, global = -5.6739447e-13, cumulative = -0.00078028933
GAMG: Solving for p_rgh, Initial residual = 0.00015557742, Final residual = 4.3762882e-06, No Iterations 2
GAMGPCG: Solving for p_rgh, Initial residual = 4.7961358e-05, Final residual = 1.5262668e-06, No Iterations 1
time step continuity errors : sum local = 1.0526006e-10, global = -2.1962042e-13, cumulative = -0.00078028933
[2] #0 Foam::error: printStack(Foam::Ostream&)[7] #0 Foam::error: printStack(Foam::Ostream&)[8] #0 Foam::error: printStack(Foam::Ostream&)[4] #0 Foam::error: printStack(Foam::Ostream&)[5] #0 Foam::error: printStack(Foam::Ostream&)[6] #0 [9] #0 Foam::error: printStack(Foam::Ostream&)[10] #0 Foam::error: printStack(Foam::Ostream&)[11] #0 Foam::error: printStack(Foam::Ostream&)[1] #0 Foam::error: printStack(Foam::Ostream&)[3] #0 Foam::error: printStack(Foam::Ostream&)Foam::error: printStack(Foam::Ostream&)[0] #0 Foam::error:rintStack(Foam::Ostream&)[14] #0 Foam::error: printStack(Foam::Ostream&)[17] #0 Foam::error: printStack(Foam::Ostream&)[19] #0 Foam::error: printStack(Foam::Ostream&)[20] #0 Foam::error: printStack(Foam::Ostream&)[12] #0 Foam::error: printStack(Foam::Ostream&)[13] #0 Foam::error: printStack(Foam::Ostream&)[15] #0 Foam::error: printStack(Foam::Ostream&)[16] #0 Foam::error: printStack(Foam::Ostream&)[18] #0 Foam::error: printStack(Foam::Ostream&)[21] #0 Foam::error: printStack(Foam::Ostream&)[22] #[23] #00 Foam::error: printStack(Foam::Ostream&)Foam::error: printStack(Foam::Ostream&)--------------------------------------------------------------------------
An MPI process has executed an operation involving a call to the
"fork()" system call to create a child process. Open MPI is currently
operating in a condition that could result in memory corruption or
other system errors; your MPI job may hang, crash, or produce silent
data corruption. The use of fork() (or system() or other calls that
create child processes) is strongly discouraged.


I hope you can help me and i will be able to give you all data you need like system/ 0/ and constant/ folders.

Best Regards

Ziad

[Bernhard]

I have been experiencing similar error-messages recently. Maybe you can look in this thread for hints: http://www.cfd-online.com/Forums/ope...ork-error.html

[ghadab]

Originally Posted by Bernhard

I have been experiencing similar error-messages recently. Maybe you can look in this thread for hints: http://www.cfd-online.com/Forums/ope...ork-error.html

Dear Bernhard,

thank you for your reply. Actually i am working on cluster and i do not have any idea if other applications run parallel with my simulation ( but i do not think so!). I started the same simulation 2 times, where in the second one i changed the MaxCo from 0.8 to 0.5. Both blow up.

[tfuwa]

Originally Posted by ghadab

Dear Bernhard,

thank you for your reply. Actually i am working on cluster and i do not have any idea if other applications run parallel with my simulation ( but i do not think so!). I started the same simulation 2 times, where in the second one i changed the MaxCo from 0.8 to 0.5. Both blow up.

Hi Ziad,

Just wondering if you have solved this. I am experiencing the same problem. The simulation just blows up at a time long after the it is stable. Can you please share your solution? Many thanks.