[uditrao04]

Hello!

I am a beginner in OpenFOAM and I have just attempted to complete an analysis by my own (using pimpleFoam/pisoFoam). I have created my own mesh (~10^5 cells) and have all the necessary calculations ready.

I filled the '0' folder files with the necessary initial conditions but while running pimpleFoam or pisoFoam, it gives me this error:

Create time

Create mesh for time = 0


PIMPLE: Operating solver in PISO mode

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
No MRF models present

No finite volume options present
Courant Number mean: 1.79393 max: 501.077
Courant Number mean: 1.79393 max: 501.077

Starting time loop

Courant Number mean: 1.79393 max: 501.077
Time = 0.5

PIMPLE: iteration 1


--> FOAM FATAL IO ERROR: (openfoam-2312)
Entry 'div((nuEff*dev2(T(grad(U)))))' not found in dictionary "system/fvSchemes/divSchemes"


file: system/fvSchemes/divSchemes at line 29 to 30.

From const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, Foam::keyType:ption) const
in file db/dictionary/dictionary.C at line 363.

FOAM exiting


I have kept the time step a bit large because I just want it to run at first, then I will make the time step finer. Also my courant number is shooting up to a lot.

I might have made some rookie mistakes, so kindly point them out to me.

Thank you!

[NotOverUnderated]

Inside the divSchemes dictionary in the file system/fvSchemes, add this line:

 div((nuEff*dev2(T(grad(U))))) Gauss linear;

[uditrao04]

I did it... but now its giving me a new error...

Create time

Create mesh for time = 0


PISO: Operating solver in PISO mode

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
No MRF models present

No finite volume options present

Starting time loop

Time = 0.5

Courant Number mean: 1.79393 max: 501.077
smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 4.5122e-06, No Iterations 5
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 1.41181e-06, No Iterations 5
smoothSolver: Solving for Uz, Initial residual = 0.000661307, Final residual = 7.04702e-07, No Iterations 2
DICPCG: Solving for p, Initial residual = 1, Final residual = 0.0438961, No Iterations 141
DICPCG: Solving for p, Initial residual = 0.00681152, Final residual = 0.000245953, No Iterations 14
DICPCG: Solving for p, Initial residual = 0.000419764, Final residual = 1.64264e-05, No Iterations 144
time step continuity errors : sum local = 0.0404384, global = -0.000684349, cumulative = -0.000684349
DICPCG: Solving for p, Initial residual = 0.00646432, Final residual = 0.000214823, No Iterations 144
DICPCG: Solving for p, Initial residual = 0.00591995, Final residual = 0.000231605, No Iterations 14
DICPCG: Solving for p, Initial residual = 0.000404036, Final residual = 9.95925e-07, No Iterations 161
time step continuity errors : sum local = 0.00128751, global = 2.78271e-06, cumulative = -0.000681566
ExecutionTime = 0.25 s ClockTime = 0 s

Time = 1

Courant Number mean: 1015.83 max: 3220.46
[stack trace]
=============
#1 Foam::sigFpe::sigHandler(int) in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so
#2 ? in /lib/x86_64-linux-gnu/libc.so.6
#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) in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so
#4 Foam::symGaussSeidelSmoother::smooth(Foam::Field<d ouble>&, Foam::Field<double> const&, unsigned char, int) const in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so
#5 Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so
#6 ? in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so
#7 Foam::fvMesh::solve(Foam::fvMatrix<Foam::Vector<do uble> >&, Foam::dictionary const&) const in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so
#8 ? in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/bin/pisoFoam
#9 ? in /lib/x86_64-linux-gnu/libc.so.6
#10 __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6
#11 ? in /usr/lib/openfoam/openfoam2312/platforms/linux64GccDPInt32Opt/bin/pisoFoam
=============
Floating point exception


The courant number is 1k....