[gooya_kabir]

Hi friends,

I have changed the PDE models in simpleFoam and removed the turbulence part in the UEqn.H and I added: laplacian (nu, U) instead of that. When I start to run, it works, but after 50 steps (means first writeInterval which is 50), below error appears.
It means that? Also, I turned the RASmodel to laminar in constant/RASmodel. Even I put k and epsilon in my initial directory, still this error appears.

Thank you for your comments.

streamLine : seeded 0 particles.
[3] [1]
[1]
[1] --> FOAM FATAL ERROR:
[1] Cannot find field k
Valid scalar fields are:
3
(
pPrevIter
nu
p
)

Valid vector fields are:1(U)
[1]
[1] From function streamLine::execute()
[1] in file streamLine/streamLine.C at line 197.
[1]
FOAM parallel run exiting

[gooya_kabir]

It's interesting that if I change RASmodel to laminar in pitzDaily Tutorial and solve it with simpleFoam, the same error appears. So something is wrong with this solver?

[nimasam]

streamLine : seeded 0 particles.
[3] [1]
[1]
[1] --> FOAM FATAL ERROR:
[1] Cannot find field k
Valid scalar fields are:
3
(
pPrevIter
nu
p
)

Valid vector fields are:1(U)
[1]
[1] From function streamLine::execute()
[1] in file streamLine/streamLine.C at line 197.
[1]
FOAM parallel run exiting

Dear Reza
it relates to streamLine function which may address in controlDict, if you disable it, then it would run smoothly

[gooya_kabir]

Thank you very much
My controlDict is as usual, but just there is a extra part at the end !!! which is:
functions
{
streamLines
{
type streamLine;

// Where to load it from (if not already in solver)
functionObjectLibs ("libfieldFunctionObjects.so");

// Output every
outputControl outputTime;
// outputInterval 10;

setFormat vtk; //gnuplot;//xmgr;//raw;//jplot;//csv;//ensight;

// Velocity field to use for tracking.
UName U;

// Tracked forwards (+U) or backwards (-U)
trackForward true;

// Names of fields to sample. Should contain above velocity field!
fields (p k U);

// Steps particles can travel before being removed
lifeTime 10000;

// Number of steps per cell (estimate). Set to 1 to disable subcycling.
nSubCycle 5;

// Cloud name to use
cloudName particleTracks;

// Seeding method. See the sampleSets in sampleDict.
seedSampleSet uniform; //cloud;//triSurfaceMeshPointSet;

uniformCoeffs
{
type uniform;
axis x; //distance;

start (-0.0205 0.001 0.00001);
end (-0.0205 0.0251 0.00001);
nPoints 10;
}
}
}

I should remove all of that?

[gooya_kabir]

I removed all of that. and now it is working )))))))))))))))))))))

Many thanks

[nimasam]

functions
{
streamLines
{
type streamLine;

// Where to load it from (if not already in solver)
functionObjectLibs ("libfieldFunctionObjects.so");

// Output every
outputControl outputTime;
// outputInterval 10;

setFormat vtk; //gnuplot;//xmgr;//raw;//jplot;//csv;//ensight;

// Velocity field to use for tracking.
UName U;

// Tracked forwards (+U) or backwards (-U)
trackForward true;

// Names of fields to sample. Should contain above velocity field!
fields (p k U);

// Steps particles can travel before being removed
lifeTime 10000;

// Number of steps per cell (estimate). Set to 1 to disable subcycling.
nSubCycle 5;

// Cloud name to use
cloudName particleTracks;

// Seeding method. See the sampleSets in sampleDict.
seedSampleSet uniform; //cloud;//triSurfaceMeshPointSet;

uniformCoeffs
{
type uniform;
axis x; //distance;

start (-0.0205 0.001 0.00001);
end (-0.0205 0.0251 0.00001);
nPoints 10;
}
}
}

you just need to remove k :P, however if you dont need that function , you can easily remove all