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May 1, 2012, 05:15
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Interfoam blows on parallel run
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#1 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17  |
Hi,
I've got an interfoam case that run well serially but blows almost immediately when run parallel (p_rgh residual became about 1e+47). Checkmesh reports: Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ /* Windows 32 and 64 bit porting by blueCAPE: http://www.bluecape.com.pt *\ | Based on Windows porting (2.0.x v4) by Symscape: http://www.symscape.com | \*---------------------------------------------------------------------------*/ Build : 2.1-c62f134541ee Exec : checkmesh Date : May 01 2012 Time : 11:03:55 Host : "UFFTECNICO7" PID : 1220 Case : M:/f900layer nProcs : 1 SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 1540991 faces: 4219890 internal faces: 3997533 cells: 1356793 boundary patches: 5 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 1166345 prisms: 50764 wedges: 0 pyramids: 0 tet wedges: 1837 tetrahedra: 31 polyhedra: 137816 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces ... Patch Faces Points Surface topology defaultFaces 0 0 ok (empty) walls 218118 251141 ok (non-closed singly connected) outlet 2833 3848 ok (non-closed singly connected) inletc 703 816 ok (non-closed singly connected) inleth 703 816 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-0.0349486 -0.0143717 -0.27418) (0.215826 0.0145106 0.00527969) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (1.383e-016 -8.59187e-016 -1.90504e-016) OK. Max cell openness = 7.62663e-016 OK. Max aspect ratio = 30.8252 OK. Minumum face area = 2.14489e-009. Maximum face area = 3.0547e-006. Face area magnitudes OK. Min volume = 4.266e-013. Max volume = 3.09268e-009. Total volume = 0.000168861. Cell volumes OK. Mesh non-orthogonality Max: 64.9781 average: 9.73097 Non-orthogonality check OK. Face pyramids OK. Max skewness = 2.08043 OK. Coupled point location match (average 0) OK. Mesh OK. End Enclosed you can find all my setup and boundary conditions. I tried to look in the forum but I wasn't able to find a clear reason with a serial run case has not to work in parallel. BTW, p_rgh residuals became huge in the very last GAMG calculation,just before the time step continuity errors print, no matter how many correctors I include. Why ? Thanks for any help.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 1, 2012, 11:11
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#2 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Just for reference I include the error interfoam returns:
Code:
M:\f900layer>mpiexec -n 4 interfoam -parallel /*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ /* Windows 32 and 64 bit porting by blueCAPE: http://www.bluecape.com.pt *\ | Based on Windows porting (2.0.x v4) by Symscape: http://www.symscape.com | \*---------------------------------------------------------------------------*/ Build : 2.1-c62f134541ee Exec : interfoam -parallel Date : May 01 2012 Time : 17:00:37 Host : "UFFTECNICO7" PID : 9224 Case : M:/f900layer nProcs : 4 Slaves : 3 ( "UFFTECNICO7.9860" "UFFTECNICO7.8832" "UFFTECNICO7.9948" ) Pstream initialized with: floatTransfer : 0 nProcsSimpleSum : 0 commsType : nonBlocking SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 PIMPLE: Operating solver in PISO mode Reading field p_rgh Reading field alpha1 Reading field U Reading/calculating face flux field phi Reading transportProperties Selecting incompressible transport model Newtonian Selecting incompressible transport model Newtonian Selecting turbulence model type RASModel Selecting RAS turbulence model kOmegaSST kOmegaSSTCoeffs { alphaK1 0.85034; alphaK2 1; alphaOmega1 0.5; alphaOmega2 0.85616; gamma1 0.5532; gamma2 0.4403; beta1 0.075; beta2 0.0828; betaStar 0.09; a1 0.31; c1 10; } Reading g Calculating field g.h time step continuity errors : sum local = 0.00111869, global = -0.00111869, cumulative = -0.00111869 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 0.0939645, No Iterations 12 GAMG: Solving for pcorr, Initial residual = 0.016886, Final residual = 0.000640254, No Iterations 2 GAMG: Solving for pcorr, Initial residual = 0.00475767, Final residual = 0.000198716, No Iterations 2 GAMG: Solving for pcorr, Initial residual = 0.00223692, Final residual = 8.4695e-005, No Iterations 2 GAMG: Solving for pcorr, Initial residual = 0.00138859, Final residual = 4.343e-005, No Iterations 2 time step continuity errors : sum local = 0.00013811, global = -6.02976e-008, cumulative = -0.00111875 Courant Number mean: 0.960669 max: 211.701 Starting time loop Courant Number mean: 0.00226573 max: 0.499295 Interface Courant Number mean: 0 max: 0 deltaT = 2.35849e-006 Time = 2.35849e-006 MULES: Solving for alpha1 Phase-1 volume fraction = 6.59604e-007 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 1.31921e-006 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 1.97881e-006 Min(alpha1) = -3.65119e-025 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 2.63842e-006 Min(alpha1) = -2.15788e-023 Max(alpha1) = 1 smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.000322717, No Iterations 2 smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 0.000337929, No Iterations 2 smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 0.0040445, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 1, Final residual = 0.068123, No Iterations 12 GAMG: Solving for p_rgh, Initial residual = 0.0173844, Final residual = 0.000657355, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00486757, Final residual = 0.000201661, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00227043, Final residual = 8.49585e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00140338, Final residual = 4.25119e-005, No Iterations 2 time step continuity errors : sum local = 3.06836e-007, global = -1.29678e-010, cumulative = -0.00111875 GAMG: Solving for p_rgh, Initial residual = 0.00129786, Final residual = 0.000116266, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.00122335, Final residual = 5.35063e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000722669, Final residual = 2.37654e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000567776, Final residual = 1.5856e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000467471, Final residual = 1.23498e-005, No Iterations 2 time step continuity errors : sum local = 8.71684e-008, global = 1.61757e-011, cumulative = -0.00111875 GAMG: Solving for p_rgh, Initial residual = 0.000415674, Final residual = 1.13259e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000353334, Final residual = 9.06858e-006, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000310302, Final residual = 7.84026e-006, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000275727, Final residual = 6.77365e-006, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000249738, Final residual = 7.4289e-008, No Iterations 9 time step continuity errors : sum local = 5.24309e-010, global = -7.94578e-013, cumulative = -0.00111875 smoothSolver: Solving for omega, Initial residual = 0.000751123, Final residual = 1.55042e-007, No Iterations 3 smoothSolver: Solving for k, Initial residual = 1, Final residual = 6.12194e-005, No Iterations 3 ExecutionTime = 83.218 s ClockTime = 83 s Courant Number mean: 0.00226108 max: 0.473956 Interface Courant Number mean: 2.85931e-006 max: 0.177277 deltaT = 2.48788e-006 Time = 4.84637e-006 MULES: Solving for alpha1 Phase-1 volume fraction = 3.33273e-006 Min(alpha1) = -8.14863e-023 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 4.02704e-006 Min(alpha1) = -1.06512e-022 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 4.72136e-006 Min(alpha1) = -1.82129e-022 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 5.41567e-006 Min(alpha1) = -3.46934e-022 Max(alpha1) = 1 smoothSolver: Solving for Ux, Initial residual = 0.347181, Final residual = 0.00123868, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0.288893, Final residual = 0.0020266, No Iterations 1 smoothSolver: Solving for Uz, Initial residual = 0.383562, Final residual = 0.00219642, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 0.0015376, Final residual = 0.000104287, No Iterations 9 GAMG: Solving for p_rgh, Initial residual = 0.419083, Final residual = 0.0417686, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 0.312039, Final residual = 0.0176243, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.0725684, Final residual = 0.00627527, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.0151413, Final residual = 0.001234, No Iterations 3 time step continuity errors : sum local = 9.63734e-008, global = 6.82369e-011, cumulative = -0.00111875 GAMG: Solving for p_rgh, Initial residual = 0.0484515, Final residual = 0.00417269, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.0624542, Final residual = 0.00412223, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.0105898, Final residual = 0.000706991, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.00328531, Final residual = 0.000314927, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00140359, Final residual = 0.000102603, No Iterations 3 time step continuity errors : sum local = 3.09792e-009, global = 2.40103e-012, cumulative = -0.00111875 GAMG: Solving for p_rgh, Initial residual = 0.00327651, Final residual = 0.00030206, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00127124, Final residual = 8.88962e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000592684, Final residual = 3.52354e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000374184, Final residual = 2.36845e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.000279674, Final residual = 8.80247e-008, No Iterations 18 time step continuity errors : sum local = 2.69836e-012, global = 3.12549e-015, cumulative = -0.00111875 smoothSolver: Solving for omega, Initial residual = 0.000222471, Final residual = 6.54908e-008, No Iterations 2 smoothSolver: Solving for k, Initial residual = 0.170403, Final residual = 4.19455e-005, No Iterations 2 ExecutionTime = 133.469 s ClockTime = 134 s Courant Number mean: 0.00238928 max: 0.494389 Interface Courant Number mean: 3.02348e-006 max: 0.198727 deltaT = 2.51301e-006 Time = 7.35939e-006 MULES: Solving for alpha1 Phase-1 volume fraction = 6.11773e-006 Min(alpha1) = -2.92291e-022 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 6.8198e-006 Min(alpha1) = -5.42996e-022 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 7.52186e-006 Min(alpha1) = -4.32711e-022 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 8.22393e-006 Min(alpha1) = -5.48215e-022 Max(alpha1) = 1 smoothSolver: Solving for Ux, Initial residual = 0.00159001, Final residual = 8.08127e-006, No Iterations 1 smoothSolver: Solving for Uy, Initial residual = 0.00518775, Final residual = 2.83385e-005, No Iterations 1 smoothSolver: Solving for Uz, Initial residual = 0.00147006, Final residual = 9.37366e-006, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 0.209561, Final residual = 0.00619473, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.0441934, Final residual = 0.00174281, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00981531, Final residual = 0.000424857, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00334192, Final residual = 0.000247085, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00158343, Final residual = 0.000131685, No Iterations 2 time step continuity errors : sum local = 1.96911e-009, global = 5.51779e-013, cumulative = -0.00111875 GAMG: Solving for p_rgh, Initial residual = 0.00272109, Final residual = 8.01031e-005, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00113411, Final residual = 4.98538e-005, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.000662833, Final residual = 4.4928e-005, No Iterations 3 GAMG: Solving for p_rgh, Initial residual = 0.000521569, Final residual = 5.21471e-005, No Iterations 4 GAMG: Solving for p_rgh, Initial residual = 0.000461228, Final residual = 1.31055e+015, No Iterations 200 time step continuity errors : sum local = 1.96724e+010, global = -2.87158e+006, cumulative = -2.87158e+006 GAMG: Solving for p_rgh, Initial residual = 0.999957, Final residual = 0.0290708, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.0871181, Final residual = 0.00777385, No Iterations 1 GAMG: Solving for p_rgh, Initial residual = 0.0194607, Final residual = 0.000887361, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.0074301, Final residual = 0.000270396, No Iterations 2 GAMG: Solving for p_rgh, Initial residual = 0.00310641, Final residual = 9.25115e-008, No Iterations 27 time step continuity errors : sum local = 1.23246e+007, global = 72576.5, cumulative = -2.799e+006 smoothSolver: Solving for omega, Initial residual = 1, Final residual = 0.000966837, No Iterations 4 smoothSolver: Solving for k, Initial residual = 0.994149, Final residual = 0.000994127, No Iterations 176 ExecutionTime = 271.695 s ClockTime = 272 s Courant Number mean: 5.34538e+013 max: 3.90337e+019 Interface Courant Number mean: 430.395 max: 2.22887e+008 deltaT = 3.21903e-026 --> FOAM Warning : From function Time::operator++() in file db/Time/Time.C at line 1010 Increased the timePrecision from 6 to 7 to distinguish between timeNames at time 7.35939e-006 Time = 7.359389e-006 --> FOAM Warning : From function Time::operator++() in file db/Time/Time.C at line 1010 Increased the timePrecision from 7 to 8 to distinguish between timeNames at time 7.35939e-006 job aborted: [ranks] message [0] process exited without calling finalize [1-3] terminated ---- error analysis ----- [0] on Ufftecnico7 interfoam ended prematurely and may have crashed. exit code 3 ---- error analysis ----- Do you think could be a meshing problem ? Thanks for any help.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 1, 2012, 11:28
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#3 |
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Member
ms
Join Date: Mar 2009
Location: West London
Posts: 47
Rep Power: 17 |
Hi. I have a similar issue and am exploring it at the moment. Current ideas include....
The pressure solver parameter, `nCellsInCoarsestLevel' is no longer appropriate with the reduced cell count in each domain. Smoothness across the entire domain is reduced during solution as each subdomain is considered in isolation of the others, other than information from the interfaces (ok, that sounds dodgy but it's the best I can do from memory). I'm paraphrasing but thought I'd try to contribute as I'm feeling depressed at the lack of feedback I'm getting on questions I've posted elsewhere. I'll see if I can find the articles I read and post them here... Good luck, I'll watch this thread.... Best regards, Mark. |
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May 1, 2012, 11:40
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#4 |
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Senior Member
Kyle Mooney
Join Date: Jul 2009
Location: San Francisco, CA USA
Posts: 323
Rep Power: 17 |
While I didn't do a great job doing an apples to apples comparison, I've seen a few parallel interFoam cases in that blowup in 1.6-ext but work fine in 2.1.x. It is worth noting that the compilation was done a little differently between the two foam versions: 1.6-ext used mvapich2 and 2.1.x was done with openMPI. Could that be an issue? I'm not too familiar with subtleties of MPI implementations.
I was going to try and figure out what the issue is but I haven't had time to dig into it. |
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May 2, 2012, 03:37
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#5 |
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Senior Member
Anton Kidess
Join Date: May 2009
Location: Germany
Posts: 1,377
Rep Power: 29 |
Daniele, this simulation is broken from the start - the continuity is way off before the first pressure correction! To debug, I'd run just one time step, and then check the results to see what happens at the boundaries.
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*On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer. |
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May 2, 2012, 03:56
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#6 |
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Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
Rep Power: 36 |
Hi,
your equation for the turbulent kinetic energy is not converging at all during the iterations. The code explodes when the equation for omega diverges. If your problem is significantly turbulent, you might want to solve k and omega at each time-step, by setting "turbOnFinalIterOnly no;" in the PIMPLE subdictionary, and eventually use PIMPLE instead of PISO, with under-relaxation (see below). Also, more in general:
Best,
__________________
Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 
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May 2, 2012, 06:03
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#7 |
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Senior Member
Olivier
Join Date: Jun 2009
Location: France, grenoble
Posts: 272
Rep Power: 17 |
hello,
Just to add my 2 cent ... try also to set maxCo at a lower value, 0.5 may be too high, try 0.2. regards, olivier |
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May 2, 2012, 16:26
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#8 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Thanks to all for so many suggestions. I'm going to try all of them.
Any idea why the sim runs serially without errors ?
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 3, 2012, 00:59
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#9 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
@Alberto: I'll try to reduce the case dimension (110MB) in order to let you have it.
In the meanwhile I tried using reltol=0 but the solver crash at the first step: Code:
M:\f900layer>mpiexec -n 4 interfoam -parallel /*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ /* Windows 32 and 64 bit porting by blueCAPE: http://www.bluecape.com.pt *\ | Based on Windows porting (2.0.x v4) by Symscape: http://www.symscape.com | \*---------------------------------------------------------------------------*/ Build : 2.1-c62f134541ee Exec : interfoam -parallel Date : May 03 2012 Time : 06:35:14 Host : "UFFTECNICO7" PID : 5656 Case : M:/f900layer nProcs : 4 Slaves : 3 ( "UFFTECNICO7.6140" "UFFTECNICO7.4864" "UFFTECNICO7.9408" ) Pstream initialized with: floatTransfer : 0 nProcsSimpleSum : 0 commsType : nonBlocking SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 PIMPLE: Operating solver in PISO mode Reading field p_rgh Reading field alpha1 Reading field U Reading/calculating face flux field phi Reading transportProperties Selecting incompressible transport model Newtonian Selecting incompressible transport model Newtonian Selecting turbulence model type RASModel Selecting RAS turbulence model kOmegaSST kOmegaSSTCoeffs { alphaK1 0.85034; alphaK2 1; alphaOmega1 0.5; alphaOmega2 0.85616; gamma1 0.5532; gamma2 0.4403; beta1 0.075; beta2 0.0828; betaStar 0.09; a1 0.31; c1 10; } Reading g Calculating field g.h time step continuity errors : sum local = 0.00111869, global = -0.00111869, cumulative = -0.00111869 GAMG: Solving for pcorr, Initial residual = 1, Final residual = 9.44929e-009, No Iterations 100 GAMG: Solving for pcorr, Initial residual = 0.0168697, Final residual = 8.39749e-009, No Iterations 37 time step continuity errors : sum local = 2.54022e-008, global = -2.22964e-010, cumulative = -0.00111869 Courant Number mean: 0.964422 max: 230.286 Starting time loop Courant Number mean: 0.00209202 max: 0.499536 Interface Courant Number mean: 0 max: 0 deltaT = 2.1692e-006 Time = 2.1692e-006 MULES: Solving for alpha1 Phase-1 volume fraction = 6.06664e-007 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 1.21333e-006 Min(alpha1) = 0 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 1.81999e-006 Min(alpha1) = -1.00739e-024 Max(alpha1) = 1 MULES: Solving for alpha1 Phase-1 volume fraction = 2.42666e-006 Min(alpha1) = -1.41385e-023 Max(alpha1) = 1 smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 1.38163e-012, No Iterations 6 smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 1.37788e-012, No Iterations 6 smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 5.12925e-011, No Iterations 5 GAMG: Solving for p_rgh, Initial residual = 1, Final residual = 5.24428e+006, No Iterations 200 GAMG: Solving for p_rgh, Initial residual = 0.793564, Final residual = 1.09358e+022, No Iterations 200 time step continuity errors : sum local = 2.17739e+023, global = 1.92673e+019, cumulative = 1.92673e+019 GAMG: Solving for p_rgh, Initial residual = 1, Final residual = 8.64916e-009, No Iterations 46 GAMG: Solving for p_rgh, Initial residual = 0.0824733, Final residual = 9.41259e-009, No Iterations 31 time step continuity errors : sum local = 4.78625e+031, global = 1.38544e+030, cumulative = 1.38544e+030 GAMG: Solving for p_rgh, Initial residual = 1, Final residual = 8.28675e-009, No Iterations 48 GAMG: Solving for p_rgh, Initial residual = 0.0725632, Final residual = 7.96813e-008, No Iterations 21 time step continuity errors : sum local = 4.52331e+070, global = 1.36619e+069, cumulative = 1.36619e+069 job aborted: [ranks] message [0] process exited without calling finalize [1-3] terminated ---- error analysis ----- [0] on Ufftecnico7 interfoam ended prematurely and may have crashed. exit code 3 ---- error analysis ----- Using the PIMPLE subdict: Code:
PIMPLE
{
//pRefCell 0;
//pRefValue 0;
turbOnFinalIterOnly no;
momentumPredictor yes;
nCorrectors 3;
nOuterCorrectors 2;
nNonOrthogonalCorrectors 1;
nAlphaCorr 1;
nAlphaSubCycles 4;
cAlpha 1;
}
Note: I haven't try yet to reduce the max Courant number. I also tried to check the decomposed BC and they are consistent with the full ones. I'm not an expert, at all, but the main thing, to me, is that the serial case is working and the parallel one no. Couldn't it be somehow linked to the processor BC, as anothr_acc suggested ? In the meanwhile I'm running the serial case with the new solution setup, just to see whether and when it's going to crash.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 4, 2012, 04:30
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#10 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Just a small update.
It seems to be a meshing problem. I'm running the same geometry meshed without the layers refinement and it's parallel running with the original setup (all but the tollerances that have been corrected as Alberto suggested). I still have some questions: - Why didn't checkmesh return any errors (even when applied to each processorX case) ? Or, better, are you aware of any case that could bring checkmesh to say OK when actually it's not ? - Is it common for a critic mesh to be even more critic once decomposed ?Shouldn't decomposition be a... transparent operation ? Just a thought... browsing the forum I've got the impression that the big part of the problems are due to meshing. Rarely a fine tune of the solution dict can move a case from crash to good. From that point of view a good mesh is very good resistant to bad setup...at least from the solver stability point of view. The check-list of every beginner (like me) should be: - Mesh - Scheme - Solution Any comment ? Anyway I'll post any news on my current case.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 5, 2012, 02:42
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#11 | |||
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Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
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Quote:
Quote:
P.S. What decomposition are you using? Scotch? Quote:
Best,
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Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.
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May 5, 2012, 06:42
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#12 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Thanks Alberto.
Yes, I'm using scotch. I'm a newbie and I'm working on a not so simple geometry, I don't think to be able to find a better decomposition than its  .Now I'm working on the geometry, reducing the smaller (and hopefully negligibles) features. My goal is to obtain a good looking layers distribution on the mesh. At the moment I've got problems on sharp corners, I'll check on the SHM forum.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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May 6, 2012, 05:37
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#13 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Quick update:
Using DICGaussSeidel and DILUGaussSeidel as smoother for GAMG and smoothSolver solvers seems to solve the problem (just few time steps, so far). I'm just following Alberto's indirect help  (http://www.cfd-online.com/Forums/ope...tml#post227426). Thanks.
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Daniele Vicario blueCFD2.1 - Windows 7 |
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June 15, 2012, 06:14
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#14 |
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Member
ms
Join Date: Mar 2009
Location: West London
Posts: 47
Rep Power: 17 |
Wow! These changes worked for me, too! I'm using simpleFoam with a Reynolds Stress turbulence model and like the case above, the solver seemed to run ok with a serial job but in parallel blew either after a long time for no clear reason, or blew on the first step.
Changing the smoother used with GAMG fixed the problem immediately. I've changed my relTols to zero (this did not cause the fix but I'm going with it anyway) and changed to the smooth solver for velocity, epsilon and R solution with the smoother specified above. Thanks so much for that tip. My jobs appear to be running now! Best regards, Mark. |
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June 15, 2012, 06:48
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#15 |
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Member
ms
Join Date: Mar 2009
Location: West London
Posts: 47
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Objectively, my pressure residuals dropped two orders of magnitude the moment I made this change. Happy days!
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December 5, 2012, 08:52
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Member
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Dear Danvica,
could you post your fvsolutions file, please? I'm a bit confused, wheter you used GAMG as preconditioner or as solver. Thank you! |
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December 22, 2012, 02:09
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#17 |
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Senior Member
Daniele Vicario
Join Date: Mar 2009
Location: Novara, Italy
Posts: 142
Rep Power: 17 |
Hi styleworker,
I'm sorry but I cannot recover the right fsolution I used. Most probable: Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.0.0 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSolution; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // solvers { pcorr // linear equation system solver for p { solver GAMG; // very efficient multigrid solver tolerance 1e-07; // solver finishes if either absolute relTol 0; // tolerance is reached or the relative // tolerance here minIter 3; // a minimum number of iterations maxIter 200; // limitation of iterions number smoother GaussSeidel; // DIC - setting for GAMG nPreSweeps 1; // 1 for p, set to 0 for all other! nPostSweeps 2; // 2 is fine nFinestSweeps 2; // 2 is fine scaleCorrection true; // true is fine directSolveCoarsestLevel false; // false is fine cacheAgglomeration on; // on is fine; set to off, if dynamic // mesh refinement is used! nCellsInCoarsestLevel 500; // 500 is fine, // otherwise sqrt(number of cells) agglomerator faceAreaPair; // faceAreaPair is fine mergeLevels 1; // 1 is fine } p_rgh { solver GAMG; // very efficient multigrid solver tolerance 1e-07; // solver finishes if either absolute relTol 0; // tolerance is reached or the relative // tolerance here minIter 3; // a minimum number of iterations maxIter 200; // limitation of iterions number smoother GaussSeidel; // DIC - setting for GAMG nPreSweeps 1; // 1 for p, set to 0 for all other! nPostSweeps 2; // 2 is fine nFinestSweeps 2; // 2 is fine scaleCorrection true; // true is fine directSolveCoarsestLevel false; // false is fine cacheAgglomeration on; // on is fine; set to off, if dynamic // mesh refinement is used! nCellsInCoarsestLevel 500; // 500 is fine, // otherwise sqrt(number of cells) agglomerator faceAreaPair; // faceAreaPair is fine mergeLevels 1; // 1 is fine } p_rghFinal { $p_rgh; tolerance 1e-06; relTol 0; } U // linear equation system solver for U { solver smoothSolver; // solver type smoother GaussSeidel; // smoother type tolerance 1e-07; // solver finishes if either absolute relTol 0; // tolerance is reached or the relative // tolerance here nSweeps 1; // setting for smoothSolver maxIter 200; // limitation of iterations number } UFinal // linear equation system solver for U { solver smoothSolver; // solver type smoother GaussSeidel; // smoother type tolerance 1e-06; // solver finishes if either absolute relTol 0; // tolerance is reached or the relative // tolerance here nSweeps 1; // setting for smoothSolver maxIter 200; // limitation of iterations number } k { solver smoothSolver; smoother GaussSeidel; tolerance 1e-7; relTol 0; nSweeps 1; } kFinal { solver smoothSolver; smoother GaussSeidel; tolerance 1e-7; relTol 0; nSweeps 1; } omega { solver smoothSolver; smoother GaussSeidel; tolerance 1e-7; relTol 0; nSweeps 1; } omegaFinal { solver smoothSolver; smoother GaussSeidel; tolerance 1e-7; relTol 0; nSweeps 1; } } relaxationFactors { p 0.2; // 0.3 is stable, decrease for bad mesh U 0.6; // 0.7 is stable, decrease for bad mesh k 0.5; omega 0.5; } PIMPLE { //pRefCell 0; //pRefValue 0; turbOnFinalIterOnly yes; momentumPredictor yes; nCorrectors 3; nOuterCorrectors 2; nNonOrthogonalCorrectors 1; nAlphaCorr 1; nAlphaSubCycles 4; cAlpha 1; } // ************************************************************************* // Daniele
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Daniele Vicario blueCFD2.1 - Windows 7 |
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