| cyln |
October 2, 2018 15:43 |
cyclicAMI - kOmegaSST - divergence issue
Hello, I am running a transient RANS simulation using pimpleFoam on OF4.1. My grid is a combination of non-comformal unstructured and structured grids. I defined an interface between the two grids using cyclicAMI (noOrdering).
I have completed my laminar simulation as it had been running without any issues. However, whenever I switch to kOmegaSST turbulence model, my simulation diverges whenever turbulence transport equations are solved for the first time. Before, I was using kOmegaSST for the same case with fully unstructured grid (without cyclicAMI) and it had been running for several thousand time steps. So, I know the divergence is related to cyclicAMI (noOrdering). I tried kEpsilon and kOmega, and I still got divergence.
As for discretization schemes, I am using linearUpwind for U, k and omega.
My boundary conditions are given below. Can anybody suggest me why my turbulent simulation (with cyclicAMI) is diverging?
polyMesh/boundary
Code:
7
(
FARFIELD
{
type patch;
nFaces 65021;
startFace 67971616;
}
OUTLET
{
type patch;
nFaces 6249;
startFace 68036637;
}
BODY
{
type wall;
inGroups 1(wall);
nFaces 158614;
startFace 68042886;
}
INTEROUTT2
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 40559;
startFace 68201500;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch INTEROUT2;
}
INTEROUT2
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 53599;
startFace 68242059;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch INTEROUTT2;
}
INTERFACET2
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 249569;
startFace 68295658;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch INTERFACE2;
}
INTERFACE2
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 308799;
startFace 68545227;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch INTERFACET2;
}
0/U
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (-40 0 0);
boundaryField
{
FARFIELD
{
type fixedValue;
value uniform (-40 0 0);
}
BODY
{
type noSlip;
}
OUTLET
{
type zeroGradient;
}
INTEROUTT2
{
type cyclicAMI;
}
INTEROUT2
{
type cyclicAMI;
}
INTERFACET2
{
type cyclicAMI;
}
INTERFACE2
{
type cyclicAMI;
}
}
0/p
Code:
internalField uniform 0.0;
boundaryField
{
FARFIELD
{
type zeroGradient;
}
BODY
{
type zeroGradient;
}
OUTLET
{
type fixedValue;
value uniform 0.0;
}
INTEROUTT2
{
type cyclicAMI;
}
INTEROUT2
{
type cyclicAMI;
}
INTERFACET2
{
type cyclicAMI;
}
INTERFACE2
{
type cyclicAMI;
}
}
0/k
Code:
internalField uniform 1e-6;
boundaryField
{
FARFIELD
{
type fixedValue;
value uniform 1e-6;
}
BODY
{
type fixedValue;
value uniform 0.0;
}
OUTLET
{
type zeroGradient;
}
INTEROUTT2
{
type cyclicAMI;
}
INTEROUT2
{
type cyclicAMI;
}
INTERFACET2
{
type cyclicAMI;
}
INTERFACE2
{
type cyclicAMI;
}
0/omega
Code:
internalField uniform 0.55 ;
boundaryField
{
FARFIELD
{
type fixedValue;
value uniform 0.55; // 0.0017; // 22.36;
}
BODY
{
type fixedValue;
value uniform 241632653;
}
OUTLET
{
type zeroGradient;
}
INTEROUTT2
{
type cyclicAMI;
}
INTEROUT2
{
type cyclicAMI;
}
INTERFACET2
{
type cyclicAMI;
}
INTERFACE2
{
type cyclicAMI;
}
0/nut
Code:
internalField uniform 0;
boundaryField
{
FARFIELD
{
type calculated;
value uniform 0;
}
OUTLET
{
type calculated;
value uniform 0;
}
BODY
{
type fixedValue;
value uniform 0;
}
INTEROUTT2
{
type cyclicAMI;
}
INTEROUT2
{
type cyclicAMI;
}
INTERFACET2
{
type cyclicAMI;
}
INTERFACE2
{
type cyclicAMI;
}
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