[Giancarlo_IngChimico]

Hi FOAMers,
I have developed a new solver that it is able to treat multi-region meshes. This solver has the same architecture of chtMultiregionFoam but it is able to solve material and energy balance for reactive system too.
When I launch a simulation in parallel I have a strange problem: it works with no problem for the first time-step, after that it crashes when reads the file: compressibleMultiRegionCourantNo.H.
This is very strange: why are there problems if it has to repeat the same operations of the first time step?

Can anyone help me?

Thanks

Best regards

Giancarlo

[Giancarlo_IngChimico]

I post the error.

Can anyone help to understand the nature of error?

Thanks

Giancarlo

[1] [2] #0  #0  Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&) in "/home/OpenFOAM/OpenFOAM-2.1.x/platfo in "/home/cfduser1/OpenFOAM/OpenFOAM-2.1.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[1] #rms/linux64GccDPOpt/lib/libOpenFOAM.so"1  Foam::sigSegv::sigHandler(int)
[2] #1  Foam::sigSegv::sigHandler(int) in "/home/OpenFOAM/OpenFOAM-2.1.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[1] #2   in "/home/OpenFOAM/OpenFOAM-2.1.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[2] #2  __restore_rt__restore_rt at sigaction.c:0
[2] #3   at sigaction.c:0
[1] #3  mainmain in "/home/GentileG/gianca/Run/parallel/multiFinal_test_parallel"
[1] #4  __libc_start_main in "/home/GentileG/gianca/Run/parallel/multiFinal_test_parallel"
[2] #4  __libc_start_main in "/lib64/libc.so.6"
[1] #5   in "/lib64/libc.so.6"
[2] #5  Foam::regIOobject::writeObject(Foam::IOstream::streamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType) constFoam::regIOobject::writeObject(Foam::IOstream::streamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType) const in "/home/GentileG/gianca/Run/parallel/multiFinal_test_parallel"
[compute:18709] *** Process received signal ***
[compute:18709] Signal: Segmentation fault (11)
[compute:18709] Signal code:  (-6)
[compute:18709] Failing at address: 0x623b00004915
[compute:18709] [ 0] /lib64/libc.so.6 [0x367c230280]
[compute:18709] [ 1] /lib64/libc.so.6(gsignal+0x35) [0x367c230215]
[compute:18709] [ 2] /lib64/libc.so.6 [0x367c230280]
[compute:18709] [ 3] multiFinal_test_parallel [0x456912]
[compute:18709] [ 4] /lib64/libc.so.6(__libc_start_main+0xf4) [0x367c21d974]
[compute:18709] [ 5] multiFinal_test_parallel(_ZNK4Foam11regIOobject11writeObjectENS_8IOstream12streamFormatENS1_13versionNumberENS1_15compressionTypeE+0x151) [0x4204a9]
[compute:18709] *** End of error message ***
--------------------------------------------------------------------------
mpirun noticed that process rank 1 with PID 18709 on node compute-3-11.local exited on signal 11 (Segmentation fault).
--------------------------------------------------------------------------
[compute.local:18707] 2 more processes have sent help message help-mpi-btl-base.txt / btl:no-nics
[compute.local:18707] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages
vi log 
[1]+  Exit 139                mpirun -np 3 multiFinal_test_parallel -parallel > log

[mbay101]

Hallo Giancarlo,

Im having exactly the same Problem. I noticed in my Simulation that the Tempratur Value in the Air Region are too high. At the second Time step i get the same Error that you have posted. It seems that OF having Problems when he try s to calculate h in Fluid Region.

You can try to run the case seriely without decomposen it.
If you get your case working please let me know, how did you do it.

Regards

[wyldckat]

Greetings to all!

mbay101's problem is being addressed here: http://www.cfd-online.com/Forums/ope...egionfoam.html


@Giancarlo: The key issue is a bad memory access:

Foam::sigSegv::sigHandler

Where SIGSEGV is further explained here: http://en.wikipedia.org/wiki/SIGSEGV

From your description, it looks like the problem is that at least one field/array has been destroyed when the iteration was finished.

Best regards,
Bruno

[manuc]

Hello

I have a new solver with structure of chtMultiregionfoam which behaves like bouyantboussinesqpimplefoam for fluid region. I ran the simulations in series and the solution converges. When I try to run it in parallel it crashes in the first step.

Used OF2.4.0



I tried to reduce the courant number to attain initial stability , but then the solver crashes after 2nd time step.

Test1

deltaT = 4.5530327e-107
Test2

--> FOAM Warning : 
From function Time::operator++()
in file db/Time/Time.C at line 1061
Increased the timePrecision from 62 to 63 to distinguish between timeNames at time 2.0707573e-07
Time = 2.07075734119138104400662664383858668770699296146631240844726562e-07


Solving for fluid region air
DILUPBiCG: Solving for T, Initial residual = 0.010403611, Final residual = 2.7324966e-12, No Iterations 1
max(T) [0 0 0 1 0 0 0] 300.02011
DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = 0.0099236724, No Iterations 251
time step continuity errors : sum local = 5.0400286e-07, global = 1.0693134e-19
--------------------------------------------------------------------------
mpirun noticed that process rank 4 with PID 17152 on node n11-42 exited on signal 8 (Floating point exception).

(I tried different decomposing methods (simple and scotch)..Also I varied simple coeff --delta-0.01 ...but no use))



problem solved:
Temperature anomoly at pressure reference cell