[daily_7]

Hello!
I am new to openFoam. I am simulating the flow of liquid in a pipe like the shape of 'Y'. I converted icem mesh to openfoam. I'm using simpleFoam solver but i got the error,

daili@daili-virtual-machine:~/daily/pipe$ simpleFoam
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5.x |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 5.x-7f7d351b741b
Exec : simpleFoam
Date : Oct 09 2022
Time : 19:16:26
Host : "daili-virtual-machine"
PID : 49074
I/O : uncollated
Case : /home/daili/daily/pipe
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0


SIMPLE: convergence criteria
field p tolerance 0.01
field U tolerance 0.001
field "(k|epsilon)" tolerance 0.001

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type RAS
Selecting RAS turbulence model realizableKE
RAS
{
RASModel realizableKE;
turbulence on;
printCoeffs on;
A0 4;
C2 1.9;
sigmak 1;
sigmaEps 1.2;
}

No MRF models present

No finite volume options present


Starting time loop

Time = 1e-05

smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.0972003, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 0.0972498, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 0.072886, No Iterations 2
GAMG: Solving for p, Initial residual = 1, Final residual = 1.4352e+82, No Iterations 1000
time step continuity errors : sum local = 1.17854e+77, global = -1.10524e+77, cumulative = -1.10524e+77
smoothSolver: Solving for epsilon, Initial residual = 0.00592644, Final residual = 5.29249e+49, No Iterations 1000
bounding epsilon, min: -1.09254e+75 max: 5.66035e+75 average: 4.99357e+71
smoothSolver: Solving for k, Initial residual = 1, Final residual = 0.0230622, No Iterations 2
bounding k, min: -1.42321e+81 max: 2.62943e+83 average: 3.03619e+80
ExecutionTime = 19.56 s ClockTime = 20 s

Time = 2e-05

smoothSolver: Solving for Ux, Initial residual = 0.0332246, Final residual = 0.00312569, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.0329014, Final residual = 0.00312953, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.0743329, Final residual = 0.00671912, No Iterations 1
#0 Foam::error:rintStack(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::lduMa trix::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::dict ionary const&) at ??:?
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/home/daili/OpenFOAM/OpenFOAM-5.x/platforms/linux64GccDPInt32Opt/bin/simpleFoam"
#8 Foam::fvMatrix<double>::solve() in "/home/daili/OpenFOAM/OpenFOAM-5.x/platforms/linux64GccDPInt32Opt/bin/simpleFoam"
#9 ? in "/home/daili/OpenFOAM/OpenFOAM-5.x/platforms/linux64GccDPInt32Opt/bin/simpleFoam"
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? in "/home/daili/OpenFOAM/OpenFOAM-5.x/platforms/linux64GccDPInt32Opt/bin/simpleFoam"

[Yann]

Hello,

In simpleFoam, you can use MRF models, or finite volume options (fvOptions) to define additional models such as porous zones, source terms, etc...

No MRF models present

No finite volume options present

These messages are just stating there is no MRF model and fvOptions for the case you are running, which is perfectly normal as long as you were not trying to use such models.

On your first iteration you get this:

GAMG: Solving for p, Initial residual = 1, Final residual = 1.4352e+82, No Iterations 1000
time step continuity errors : sum local = 1.17854e+77, global = -1.10524e+77, cumulative = -1.10524e+77

Pressure is diverging and you have continuity error: most probably something is wrong with your boundary conditions.

Regards,
Yann