[Cfdjunior]

Hello , I am trying to use the simpleFoam solver for a cylindrical flow for a rotating exhaust fan , but i seem to be getting these errors for every step
The time step continuity error seems to be diverging rather than converging
Time = 5

smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.091959499, No Iterations 5
smoothSolver: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver: Solving for Uz, Initial residual = 0, Final residual = 0, No Iterations 0
GAMG: Solving for p, Initial residual = 1, Final residual = 0.077236211, No Iterations 4
time step continuity errors : sum local = 0.0043637581, global = -2.3391276e-08, cumulative = -2.3391276e-08
smoothSolver: Solving for omega, Initial residual = 0.31633517, Final residual = 0.021362197, No Iterations 4
smoothSolver: Solving for k, Initial residual = 0.99999998, Final residual = 0.091347867, No Iterations 14
ExecutionTime = 293.99 s ClockTime = 301 s

If possible can someone please help me with this , i am very new to OpenFoam , Thank you
here is p file
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v1912 |
| \\ / A nd | Website: www.openfoam.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
AMI1
{
type cyclicAMI;
value uniform 0;
}
AMI2
{
type cyclicAMI;
value uniform 0;
}
exhaustfan
{
type fixedFluxPressure;
value uniform 0;
}
inlet
{
type fixedFluxPressure;
value uniform 0;
}
outlet
{
type fixedValue;
value uniform 0;
}
rotating_zone
{
type fixedFluxPressure;
value uniform 0;
}

}

// ************************************************** *********************** //

[Lapka]

Ideas to try out:
transient calc, different BC and starting field, run checkMesh and see that the quality of mesh is not abhorrent, see that everything you put into the calc is physical, different turbulence modelling.


edit: I don't have time to really look into it. But at the first glance.... Do you expect everything to be really zero with your BC?

[Cfdjunior]

Mesh seems to be ok says a few volumes aren't connected to the faces, the values of 0 was just to try out , haven't actually calculated , have to try out others ,
I am not sure what kind of values to use for this , if anyone else can help with this one please do

Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
points: 1273985
internal points: 1182188
faces: 14617567
internal faces: 14433989
cells: 7252299
faces per cell: 4.005841
boundary patches: 6
point zones: 0
face zones: 2
cell zones: 2

Overall number of cells of each type:
hexahedra: 0
prisms: 42360
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 7209939
polyhedra: 0

Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
*Number of regions: 2
The mesh has multiple regions which are not connected by any face.
<<Writing region information to "0/cellToRegion"
<<Writing region 0 with 256775 cells to cellSet region0
<<Writing region 1 with 6995524 cells to cellSet region1

Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
exhaustfan 8472 4238 ok (closed singly connected)
rotating_zone 131376 65879 ok (non-closed singly connected)
inlet 6287 3240 ok (non-closed singly connected)
outlet 6287 3240 ok (non-closed singly connected)
AMI1 15578 7791 ok (closed singly connected)
AMI2 15578 7791 ok (closed singly connected)

Checking geometry...
Overall domain bounding box (-0.1502419 -0.1526393 -1.2) (0.1532621 0.1508648 0.25)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (6.802691e-16 -4.582934e-16 -6.291465e-17) OK.
Max cell openness = 4.843088e-15 OK.
Max aspect ratio = 174.3325 OK.
Minimum face area = 2.046952e-08. Maximum face area = 2.851991e-05. Face area magnitudes OK.
Min volume = 2.832708e-11. Max volume = 3.812381e-08. Total volume = 0.1045641. Cell volumes OK.
Mesh non-orthogonality Max: 81.61225 average: 15.7007
*Number of severely non-orthogonal (> 70 degrees) faces: 8.
Non-orthogonality check OK.
<<Writing 8 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 2.811787 OK.
Coupled point location match (average 0) OK.

Mesh OK.

End

[Cfdjunior]

Its still telling me that mesh surface/regions are not connected to faces , anyone any idea how to mend this , i havent actually used any meshing from Openfoam converted i.e totally ignored snappyhexmesh and blockmesh ,instead using Ansys