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time Step's turbFoam >>> exit

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Old   December 7, 2009, 06:23
Default time Step's turbFoam >>> exit
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Markus Golbs Hamm AG
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Hello,

by "runnig" turbFoam it is incidental following error:

Quote:
Application started with pid 19758
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.4.1 |
| \\ / A nd | Web: http://www.openfoam.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Exec : turbFoam /opt/OpenFOAM/caelinux-1.4.1/run 2009-12-04-hd90-110-tankmodi
Date : Dec 07 2009
Time : 11:31:26
Host : localhost
PID : 19758
Root : /opt/OpenFOAM/caelinux-1.4.1/run
Case : 2009-12-04-hd90-110-tankmodi
Nprocs : 1
Create time
Create mesh for time = 0
Reading field p
Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting turbulence model kEpsilon
Starting time loop
Time = 0.005
Courant Number mean: 0 max: 0.310559
DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 1.90559e-16, No Iterations 1
DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 6.82425e-17, No Iterations 1
DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 1.88334e-16, No Iterations 1
DICPCG: Solving for p, Initial residual = 1, Final residual = 9.53834e-07, No Iterations 531
time step continuity errors : sum local = 1.01638e-12, global = -2.86164e-16, cumulative = -2.86164e-16
DICPCG: Solving for p, Initial residual = 0.121827, Final residual = 9.6773e-07, No Iterations 431
time step continuity errors : sum local = 3.30156e-12, global = 4.20648e-16, cumulative = 1.34484e-16
#0 Foam::errorrintStack(Foam::Ostream&) in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Uninterpreted: [0xffffe420]
#3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#4 void Foam::divide<Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libincompressibleTurbulenceModels.so"
#5 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foamerator/<Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<doub le, Foam::fvPatchField, Foam::volMesh> > const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libincompressibleTurbulenceModels.so"
#6 Foam::turbulenceModels::kEpsilon::correct() in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libincompressibleTurbulenceModels.so"
#7 main in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/turbFoam"
#8 __libc_start_main in "/lib/i686/libc.so.6"
#9 Foam::regIOobject::readIfModified() in "/home/caelinux/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/turbFoam"
At present I dont understand effect of definition Parameters starttime, andtime and timestep. What is the ambition of time definition's? Which mistake of the fluid flow can I take whis a false definition of time window? I'm a cfd beginner whis basics in fluid dynamics in academic studies.

Greeting Markus
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Old   December 7, 2009, 06:35
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Niels Gjoel Jacobsen
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Hi Markus

Your simulation is crashing as you have specified 0 as either boundary conditions or as an internal initial value on the k or epsilon fields. These should be small but finite, e.g. 1e-11.

Bests

Niels
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Old   December 7, 2009, 11:01
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Markus Golbs Hamm AG
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Hello,

thank's for the informations. I don't understand, what define always the "internal initial's"?

In turbFoam for air analysis whis wall's, air input and air output me interested allocation of "flow velocity" and allocation of
pressure. Which mistake's can I take by seting k and epsillon whis 1e-11?

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Old   December 7, 2009, 11:30
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ngj
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Niels Gjoel Jacobsen
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What I mean is that you cannot have initialized k or epsilon to take the value 0 as an internal value nor a boundary value. It needs to have a finite value. The files are located in /0/.
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Old   December 8, 2009, 04:48
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Markus Golbs Hamm AG
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Hello,

thank's for the information's. Is the internalField the "medium" or a "startcase" and the boundaryField the "wall, input Surface and output Surface" or other definition?

Under Fields [turbFoam, >>U, p, k, epsillon, R, nuTilda] for example are Name {internal Field Value - uniform} and {Name_Input - Parameters...}. Which effect's bring's seting's under {internal Field Value - uniform} uniform?

In the User Guid 2.1.1.2 in a example are set "internalField uniform 0;". What I define whis this seting?

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