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August 7, 2018, 11:18 |
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#81 | |
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Quote:
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August 7, 2018, 11:21 |
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#82 | |
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Posts: 52
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Quote:
https://en.wikipedia.org/wiki/Signal_(IPC)#SIGFPE |
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September 2, 2018, 12:03 |
Foam::error::PrintStack
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#83 |
New Member
ceren cilavdaroğlu
Join Date: Aug 2018
Location: Turkey
Posts: 6
Rep Power: 8 |
Hello all,
I am having a similar error in using weirOwerflow Below is the log folder: Code:
Courant Number mean: 5.66695e+09 max: 3.11881e+15 Interface Courant Number mean: 0.0013693 max: 334.573 deltaT = 3.76816e-51 Time = 0.615178 PIMPLE: iteration 1 MULES: Solving for alpha.water Phase-1 volume fraction = 1 Min(alpha.water) = 0.656874 Max(alpha.water) = 1.29113 MULES: Solving for alpha.water Phase-1 volume fraction = 1 Min(alpha.water) = 0.656874 Max(alpha.water) = 1.36343 DICPCG: Solving for p_rgh, Initial residual = 0.991688, Final residual = 0.0386321, No Iterations 2 time step continuity errors : sum local = 3.17812e+17, global = 1.31038e+17, cumulative = 1.31038e+17 DICPCG: Solving for p_rgh, Initial residual = 9.85132e-44, Final residual = 9.85132e-44, No Iterations 0 time step continuity errors : sum local = 3.17915e+17, global = 1.31083e+17, cumulative = 2.62121e+17 DICPCG: Solving for p_rgh, Initial residual = 9.8524e-44, Final residual = 9.8524e-44, No Iterations 0 time step continuity errors : sum local = 3.1795e+17, global = 1.31132e+17, cumulative = 3.93252e+17 -------------------------------------------------------------------------- mpirun noticed that process rank 0 with PID 10107 on node ceren-CASPER-BILGISAYAR-SISTEMLERI-A-S exited on signal 8 (Floating point exception). i am the beginner. please help me.. Thanks in advance for your reply Ceren |
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September 7, 2018, 11:16 |
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#84 | |
Senior Member
Deep
Join Date: Oct 2017
Posts: 180
Rep Power: 8 |
Quote:
Your Courant Numbers (entries in bold) and timestep continuity errors are huge. This suggests:
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September 18, 2019, 06:53 |
buoyantSimpleFoam crash - turbulence related
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#85 | |
Member
Gareth
Join Date: Jun 2010
Posts: 56
Rep Power: 16 |
Hi All
this is a great thread, old though it may be, and very informative. I will start with my problem. I am trying to run buoyantSimpleFoam on a engine test cell. I am not modelling flow in the engine. Instead I have no mesh where the engine sis. Instead i have inlet and outlet boundaries for the engine inlet and outlet. I am trying to see re-circulation within the test cell (room). I started out the simulation with just simpleFoam, to see if a cold flow run would work,. yeah success. Then i added turbulence to the mix and also success. The final step was adding heat, so i switched to buoyantSimplefoma as the temperature difference between the room and engine exhaust was greater than 10 degrees. Below you can see the last section of my log file. I am getting a floating point exception. So there are some odd maths going on. Code:
Time = 5 DILUPBiCGStab: Solving for Ux, Initial residual = 0.181033, Final residual = 3.19602e-05, No Iterations 1 DILUPBiCGStab: Solving for Uy, Initial residual = 0.236924, Final residual = 6.02134e-05, No Iterations 1 DILUPBiCGStab: Solving for Uz, Initial residual = 0.210526, Final residual = 3.29874e-05, No Iterations 1 DILUPBiCGStab: Solving for h, Initial residual = 0.0253854, Final residual = 6.01331e-05, No Iterations 2 #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::sigFpe::sigHandler(int) at ??:? #2 ? in "/lib/x86_64-linux-gnu/libc.so.6" #3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:? #4 Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:? #5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:? #6 Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:? #7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:? #8 Foam::fvMatrix<double>::solve() at ??:? #9 ? at ??:? #10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #11 ? at ??:? Floating point exception (core dumped) After reading through this thread i followed the crumbs and saw my epsilon was going negative. And this knocked on to how my p_rgh was being calculated. So i now assume i have the wrong boundary condition epsilon and k. I have attached the patch summary and the log file of the simulation run. If anyone could please advise on what i am supposed to use for boundary conditions i would be very grateful. For reference my patches are named: Quote:
Look fwd to your help |
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September 27, 2019, 14:11 |
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#86 |
New Member
Join Date: Sep 2019
Posts: 5
Rep Power: 7 |
Hi Gareth,
I am also experiencing a similar error when I try to run buoyantSimpleFoam. I am very new to OpenFOAM. My problem is that of a heat exchanger (cold cylinder) in hot flow. For the moment, I am only looking at a 2D problem. In order to familiarise myself with OpenFOAM, I first tried to work on the cold flow case using simpleFoam and it works fine. The moment I add heat transfer, it goes bonkers and I am not able to understand the error. From what Bruno mentioned in the beginning of the thread, all I could gather was that somewhere in my code there is some nasty math happening. But I am not able to figure out where. I am also not very confident with my BCs. I thought flow over a cylinder with heat transfer is sort of a standard problem that many people must have worked on. Unfortunately, the countless hours spend on the internet trying to figure out the BCs didn't help me much. Eventually, I decided to follow the example of CicuitBoardCooling in the tutorials. But, still going nowhere. If somebody wants to see how my domain looks like, it is nothing but a half cylinder with symmetry conditions on the top and bottom wall. There is a velocity inlet and the pressure is assumed to be constant. The flow is hot and the tube is cold with a fixed temperature prescribed to it. I would have included the schematic if I knew how to include as attachments. Hope somebody can help me with that as well. If somebody is willing to have a look at my codes, do let me know, I can post them here. Cheers! |
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September 27, 2019, 14:29 |
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#87 | |
New Member
Rsingh
Join Date: Mar 2016
Posts: 4
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Quote:
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September 27, 2019, 14:44 |
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#88 | ||||
New Member
Join Date: Sep 2019
Posts: 5
Rep Power: 7 |
Hi Ranjit,
Thank you for the reply. The closest tutorial that I can compare with my case is that of CircuitCooling. Shown below are my P, T and U codes. I am really doubtful of how to define p_rgh though, as this concept is a bit tricky for me to grasp. Is p_rgh really pressure? what value should we give? etc. Code for P: Quote:
Code for T: Quote:
Code for U: Quote:
And finally Code for p_rgh: Quote:
My simulation crashes after the 9th step. Don't know why. |
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September 30, 2019, 03:57 |
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#89 | |
Member
Gareth
Join Date: Jun 2010
Posts: 56
Rep Power: 16 |
Quote:
Hi ASurendran In my case there were some poor cells causing me trouble. while checkMesh gave me the all clear, a personal inspection of the mesh showed me what to fix. But i think the boundary conditions are usually a culprit. If you want to eliminate meshing as a possible source try a very simple setup with well defines cells... regards |
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September 30, 2019, 04:55 |
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#90 |
New Member
Join Date: Sep 2019
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Hi Gareth,
Thank you for your suggestion. I will check the mesh and BCs as suggested. Kind regards |
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October 3, 2019, 07:01 |
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#91 |
New Member
Join Date: Sep 2019
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Hi All,
I forgot to mention that I work on High pressure flows with high temperature differences i.e., my domain pressure is of the order of 10bars and the difference in temperature between the flow and the heat exchanger is around 1100K. Has anyone encountered such situations? To Gareth - I tried other possible BCs. Sadly, none of them worked. |
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December 21, 2022, 04:50 |
Hello I'm having same issue
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#92 |
New Member
Paul
Join Date: Dec 2022
Posts: 1
Rep Power: 0 |
My case is a floating sphere by the influence of the waves, with a morphing mesh
Courant Number mean: 0.000235953687854 max: 43.0429793229 Interface Courant Number mean: 4.53166165807e-05 max: 42.9775097418 Time = 0.003 time step continuity errors : sum local = 3994.71241642, global = 6.63671275067e-12, cumulative = 3.23341262596e-08 #0 Foam::error:rintStack(Foam::Ostream&) at ??:? #1 Foam::sigFpe::sigHandler(int) at ??:? #2 ? in /lib/x86_64-linux-gnu/libpthread.so.0 #3 Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) at ??:? #4 Foam::symGaussSeidelSmoother::scalarSmooth(Foam::F ield<double>&, Foam::Field<double> const&, unsigned char, int) const at ??:? #5 Foam::symGaussSeidelSmoother::smooth(Foam::Field<d ouble>&, Foam::Field<double> const&, unsigned char, int) const at ??:? #6 Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:? #7 Foam::fvMatrix<double>::solveSegregated(Foam::dict ionary const&) at ??:? #8 Foam::fvMatrix<double>::solveSegregatedOrCoupled(F oam::dictionary const&) at ??:? #9 Foam::fvMesh::solve(Foam::fvMatrix<double>&, Foam::dictionary const&) const at ??:? #10 Foam::fvMatrix<double>::solve() in /usr/lib/openfoam/openfoam2206/platforms/linux64GccDPInt32Opt/bin/interFoam #11 ? in /usr/lib/openfoam/openfoam2206/platforms/linux64GccDPInt32Opt/bin/interFoam #12 __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6 #13 ? in /usr/lib/openfoam/openfoam2206/platforms/linux64GccDPInt32Opt/bin/interFoam Floating point exception |
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May 21, 2024, 07:56 |
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#93 |
New Member
Goind Sharma
Join Date: Sep 2018
Posts: 25
Rep Power: 8 |
HI,
I am having the same type of issue (parallel mode), but it works fine in serial mode. solving3-D cloud reactingCloud1 [4] #0 Foam::error:rintStack(Foam::Ostream&) at ??:? [4] #1 Foam::sigFpe::sigHandler(int) at ??:? [4] #2 ? in /lib/x86_64-linux-gnu/libc.so.6 [4] #3 ? in /lib/x86_64-linux-gnu/libm.so.6 [4] #4 exp in /lib/x86_64-linux-gnu/libm.so.6 [4] #5 Foam::integrationSchemes::analytical::dtEff(double , double) const at ??:? [4] #6 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #7 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #8 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #9 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #10 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #11 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #12 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #13 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [4] #14 ? in /lib/x86_64-linux-gnu/libc.so.6 [4] #15 __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6 [4] #16 ? in ~/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/bin/reactingParcelFoam [ufifilters-HP-Z4-G4-Workstation:1219358] *** Process received signal *** [ufifilters-HP-Z4-G4-Workstation:1219358] Signal: Floating point exception (8) [ufifilters-HP-Z4-G4-Workstation:1219358] Signal code: (-6) [ufifilters-HP-Z4-G4-Workstation:1219358] Failing at address: 0x3e800129b1e [ufifilters-HP-Z4-G4-Workstation:1219358] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x42520)[0x7661fc442520] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 1] /lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x12c)[0x7661fc4969fc] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 2] /lib/x86_64-linux-gnu/libc.so.6(raise+0x16)[0x7661fc442476] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 3] /lib/x86_64-linux-gnu/libc.so.6(+0x42520)[0x7661fc442520] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 4] /lib/x86_64-linux-gnu/libm.so.6(+0x709e0)[0x766200f899e0] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 5] /lib/x86_64-linux-gnu/libm.so.6(exp+0x13)[0x766200f50f03] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 6] /home/ufi-filters/OpenFOAM-v2112/platforms/linux64GccDPInt32Opt/lib/liblagrangianIntermediate.so(_ZNK4Foam18integratio nSchemes10analytical5dtEffEdd+0x43)[0x7661ff59a573] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 7] reactingParcelFoam(+0xc23c2)[0x63d71695c3c2] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 8] reactingParcelFoam(+0xe1156)[0x63d71697b156] [ufifilters-HP-Z4-G4-Workstation:1219358] [ 9] reactingParcelFoam(+0xec917)[0x63d716986917] [ufifilters-HP-Z4-G4-Workstation:1219358] [10] reactingParcelFoam(+0xed613)[0x63d716987613] [ufifilters-HP-Z4-G4-Workstation:1219358] [11] reactingParcelFoam(+0x15925d)[0x63d7169f325d] [ufifilters-HP-Z4-G4-Workstation:1219358] [12] reactingParcelFoam(+0x159c09)[0x63d7169f3c09] [ufifilters-HP-Z4-G4-Workstation:1219358] [13] reactingParcelFoam(+0x159e6c)[0x63d7169f3e6c] [ufifilters-HP-Z4-G4-Workstation:1219358] [14] reactingParcelFoam(+0x5be4c)[0x63d7168f5e4c] [ufifilters-HP-Z4-G4-Workstation:1219358] [15] /lib/x86_64-linux-gnu/libc.so.6(+0x29d90)[0x7661fc429d90] [ufifilters-HP-Z4-G4-Workstation:1219358] [16] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80)[0x7661fc429e40] [ufifilters-HP-Z4-G4-Workstation:1219358] [17] reactingParcelFoam(+0x62ad5)[0x63d7168fcad5] [ufifilters-HP-Z4-G4-Workstation:1219358] *** End of error message *** -------------------------------------------------------------------------- Primary job terminated normally, but 1 process returned a non-zero exit code. Per user-direction, the job has been aborted. -------------------------------------------------------------------------- -------------------------------------------------------------------------- mpirun noticed that process rank 4 with PID 0 on node ufifilters-HP-Z4-G4-Workstation exited on signal 8 (Floating point exception). And one more thing, I tried to compile the openfoam in debug mod but it failed, couldn't compile. How do I look up at this problem? Regards, Govind |
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