| anuargimenez |
July 3, 2022 16:58 |
Strange results using AMI. Meshing with Ansys.
Hello,
I am trying to use the Arbitrary Rotating AMI case to simulate a polymer flow through a single screw extruder, and I would really appreciate any help.
Previously, I have been able to successfully run the same case using the MRF approach, with good results.
The geometry is shown bellow:
Attachment 90568
The mesh was generated using ANSYS. Then, I used the topoSet utility to create the rotating and stationary cellZone, and also the faceZone needed to develop the AMI patches.
The topoSetDict file is shown bellow:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: dev |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object topoSetDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
actions
(
{
name rotif;
type cellSet;
action new;
source cylinderToCell;
sourceInfo
{
p1 (0 0.004 0);
p2 (0 0.043703 0);
radius 0.00396;
}
}
{
name outerCells;
type cellSet;
action new;
source cellToCell;
sourceInfo
{
set rotif;
}
}
{
name outerCells;
type cellSet;
action invert;
}
{
name rotif;
type cellZoneSet;
action new;
source setToCellZone;
sourceInfo
{
set rotif;
}
}
{
name rotifFace;
type faceSet;
action new;
source cellToFace;
sourceInfo
{
set rotif;
option all;
}
}
{
name rotifFace;
type faceSet;
action subset;
source cellToFace;
sourceInfo
{
set outerCells;
option all;
}
}
{
name rotif;
type faceZoneSet;
action new;
source setsToFaceZone;
sourceInfo
{
faceSet rotifFace;
cellSet rotif;
}
}
);
// ************************************************************************* //
Finally, with the createBaffles utility I defined the AMI patches as follows:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 7
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object createPatchDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
internalFacesOnly true;
baffles
{
rotating
{
type faceZone;
zoneName rotif;
patches
{
master
{
name AMI1;
type cyclicAMI;
neighbourPatch AMI2;
transform rotational;
rotationAxis (0 1 0);
rotationCentre (0 0 0);
}
slave
{
name AMI2;
type cyclicAMI;
neighbourPatch AMI1;
transform rotational;
rotationAxis (0 1 0);
rotationCentre (0 0 0);
}
}
}
}
// ************************************************************************* //
This is the script I used to run the case:
Code:
#!/bin/sh
cd ${0%/*} || exit 1 # Run from this directory
# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions
application=$(getApplication)
runApplication fluentMeshToFoam AMI.msh
#Create cellZones and faceZones for rotating mesh. Develop new AMI BC´s
runApplication topoSet
runApplication createBaffles -overwrite
runApplication mergeOrSplitBaffles -split -overwrite
# Renumbering for speeding up simulation
runApplication renumberMesh -noFields -overwrite
decomposePar
pyFoamPlotRunner.py mpirun -np 6 rhoPimpleFoam -parallel
echo "Done!"
Here you can see the AMI patches:
Attachment 90570
and the velocity field obtained in the rotating cellZone:
Attachment 90569
As you can see, the velocity field seems wrong. In my MRF simulation the effect of the rotation due to the screw was very clear. With the AMI approach it seems that the highest velocity values are at the inlet, which is an unreal result.
I hope anyone could give me some advice or correct me if there is any error. I have little experience using AMI.
Kind Regards,
Anuar R. Giménez El Amrani |
