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-   -   problems with a LES incompressible calculation (pisoFoam) (https://www.cfd-online.com/Forums/openfoam/75250-problems-les-incompressible-calculation-pisofoam.html)

laurencep April 20, 2010 09:37

problems with a LES incompressible calculation (pisoFoam)
 
I am a new user of openFoam.

I'm looking for information to carry out a non stationary calculation of turbulence under a hull of boat in LES.
I do not arrive has to initialize my calculation correctly because it diverges very quickly (Co number >> 1).
the result obtained on the pressure are wrong (-4.5e14 with 4.5e14)

I use the solver pisoFoam, with the model of turbulence dynamicSmagorinsky

is what somebody will be able to help?

thank you

CedricVH April 20, 2010 09:44

First try to decrease the time step in order to decrease the courant number. If this is not possible, then try using pimpleFoam instead of pisoFoam as this solver can iterate several times trough your U and p equations during one time step.

If the case still diverges, try using a different LES model such as OneEqEddy.

laurencep April 22, 2010 04:53

thank you for your answer.

I have to try to decrease the step of time and to change the model. Calculation always diverges.

I have to test the model pimpleFoam (Smagorinsky and cubeRootVol delta) I obtain an error message at the end of about fifteen iterations.

Do you have an idea from what does not go?

thank you

error message :
************************************************** *********************
[0] [1] ##0 0 Foam::error::printStack(Foam::Ostream&)Foam::error ::printStack(Foam::Ostream&)[3] #0 [2] #0 Foam::error::printStack(Foam::Ostream&)Foam::error ::printStack(Foam::Ostream&) in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[1] #1 Foam::sigFpe::sigFpeHandler(int) in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[0] #1 Foam::sigFpe::sigFpeHandler(int) in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[3] #1 Foam::sigFpe::sigFpeHandler(int) in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[2] #1 Foam::sigFpe::sigFpeHandler(int) in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[1] #2 in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[0] #2 ?? in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[3] #2 in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[2] #2 ?? in "/lib64/tls/libc.so.6"
[1] #3 Foam::Time::adjustDeltaT()???? in "/lib64/tls/libc.so.6"
[0] #3 Foam::Time::adjustDeltaT() in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[1] #4 in "/lib64/tls/libc.so.6"
[3] #3 Foam::Time::adjustDeltaT() in "/lib64/tls/libc.so.6"
[2] #3 Foam::Time::adjustDeltaT() in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[0] #4 in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[3] #4 in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so"
[2] #4 mainmainmainmain in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/applications/bin/linux64GccDPOpt/pimpleFoam"
[1] #5 __libc_start_main in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/applications/bin/linux64GccDPOpt/pimpleFoam"
[0] #5 __libc_start_main in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/applications/bin/linux64GccDPOpt/pimpleFoam"
[2] #5 __libc_start_main in "/home/users/applis/OpenFOAM/OpenFOAM-1.6/applications/bin/linux64GccDPOpt/pimpleFoam"
[3] #5 __libc_start_main in "/lib64/tls/libc.so.6"
[1] #6 in "/lib64/tls/libc.so.6"
[0] #6 in "/lib64/tls/libc.so.6"
[2] #6 in "/lib64/tls/libc.so.6"
[3] #6 _start_start_start_start at ../sysdeps/x86_64/elf/start.S:116
[node02:13104] *** Process received signal ***
[node02:13104] Signal: Floating point exception (8)
[node02:13104] Signal code: (-6)
[node02:13104] Failing at address: 0x1fa00003330
[node02:13104] [ 0] /lib64/tls/libc.so.6 [0x2a98178410]
[node02:13104] [ 1] /lib64/tls/libc.so.6(gsignal+0x3d) [0x2a9817837d]
[node02:13104] [ 2] /lib64/tls/libc.so.6 [0x2a98178410]
[node02:13104] [ 3] /home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so(_ZN4Foam4Time12adjustDeltaTEv+0x59) [0x2a974f73d9]
[node02:13104] [ 4] pimpleFoam [0x41656b]
[node02:13104] [ 5] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x2a981664bb]
[node02:13104] [ 6] pimpleFoam [0x415759]
[node02:13104] *** End of error message ***
at ../sysdeps/x86_64/elf/start.S:116
[node02:13103] *** Process received signal ***
[node02:13103] Signal: Floating point exception (8)
[node02:13103] Signal code: (-6)
[node02:13103] Failing at address: 0x1fa0000332f
[node02:13103] [ 0] /lib64/tls/libc.so.6 [0x2a98178410]
[node02:13103] [ 1] /lib64/tls/libc.so.6(gsignal+0x3d) [0x2a9817837d]
[node02:13103] [ 2] /lib64/tls/libc.so.6 [0x2a98178410]
[node02:13103] [ 3] /home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so(_ZN4Foam4Time12adjustDeltaTEv+0x59) [0x2a974f73d9]
[node02:13103] [ 4] pimpleFoam [0x41656b]
[node02:13103] [ 5] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x2a981664bb]
[node02:13103] [ 6] pimpleFoam [0x415759]
[node02:13103] *** End of error message ***
at ../sysdeps/x86_64/elf/start.S:116
[node01:13082] *** Process received signal ***
[node01:13082] Signal: Floating point exception (8)
[node01:13082] Signal code: (-6)
[node01:13082] Failing at address: 0x1fa0000331a
[node01:13082] [ 0] /lib64/tls/libc.so.6 [0x2a98178410]
[node01:13082] [ 1] /lib64/tls/libc.so.6(gsignal+0x3d) [0x2a9817837d]
[node01:13082] [ 2] /lib64/tls/libc.so.6 [0x2a98178410]
[node01:13082] [ 3] /home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so(_ZN4Foam4Time12adjustDeltaTEv+0x59) [0x2a974f73d9]
[node01:13082] [ 4] pimpleFoam [0x41656b]
[node01:13082] [ 5] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x2a981664bb]
[node01:13082] [ 6] pimpleFoam [0x415759]
[node01:13082] *** End of error message ***
at ../sysdeps/x86_64/elf/start.S:116
[node01:13083] *** Process received signal ***
[node01:13083] Signal: Floating point exception (8)
[node01:13083] Signal code: (-6)
[node01:13083] Failing at address: 0x1fa0000331b
[node01:13083] [ 0] /lib64/tls/libc.so.6 [0x2a98178410]
[node01:13083] [ 1] /lib64/tls/libc.so.6(gsignal+0x3d) [0x2a9817837d]
[node01:13083] [ 2] /lib64/tls/libc.so.6 [0x2a98178410]
[node01:13083] [ 3] /home/users/applis/OpenFOAM/OpenFOAM-1.6/lib/linux64GccDPOpt/libOpenFOAM.so(_ZN4Foam4Time12adjustDeltaTEv+0x59) [0x2a974f73d9]
[node01:13083] [ 4] pimpleFoam [0x41656b]
[node01:13083] [ 5] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x2a981664bb]
[node01:13083] [ 6] pimpleFoam [0x415759]
[node01:13083] *** End of error message ***


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