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March 1, 2018, 13:10 |
Arbitrary Rotating AMI
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#1 |
New Member
Paul
Join Date: Nov 2017
Posts: 15
Rep Power: 8 |
Hello,
I am trying to understand the Arbitrary Rotating AMI case (https://holzmann-cfd.de/openfoam/ope...y-rotating-ami), and I would really appreciate any help to some questions about the tutorial. 1) If I run the case with ./run, everything is smooth, but could it be the same if I type each line in the terminal? I can't do in that way because when I type the first line cd ${0%/*} || exit 1, the location changes to /usr/bin, and I cannot type the next lines because I got errors of location. 2) I have opened AMI.stl and regionSTL.stl in Paraview, but I can't find any patch. Is it because I would need to open in a specific software? 3) Could I add heat transfer equations (radiation, convection) to pimpleDymFoam? Is it possible to use a method similar to the one found here (http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam). Kind Regards, Paul |
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March 4, 2018, 11:44 |
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#2 |
Super Moderator
Tobias Holzmann
Join Date: Oct 2010
Location: Bad Wörishofen
Posts: 2,711
Blog Entries: 6
Rep Power: 52 |
Hi,
1. yes you can type everything in a terminal but the first command is not related to OpenFOAM stuff. Check google for the answer what that is doing. 2. regionSTL included region names. Patches are generated by snappyHexMesh. Read the user guide (there are so many references out nowadays; no need to explain it again and again) 3. Yes you can. The link you mentioned is just a passive scalar equation. The things you would like to use is a bit more work. Therefore, I would directly use a density based solver. By the way - convection / advection is always included.
__________________
Keep foaming, Tobias Holzmann |
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March 6, 2018, 18:20 |
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#3 |
New Member
Paul
Join Date: Nov 2017
Posts: 15
Rep Power: 8 |
Hi Tobias,
Thanks. Here are my understanding about your explanation. 1) It works differently when I run in the terminal because it goes to the root, but if I use in a document, it says only that I'll run from that directory. 2) I have opened as text file, and I can see that you have created the region names in the stl. file, then apply snappyHexMeshDict. 3) I'll check that in more detail. Thanks again for your answer. Paul |
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July 3, 2022, 17:57 |
Strange results using AMI. Meshing with Ansys.
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#5 |
New Member
Anuar Giménez
Join Date: Feb 2022
Location: Spain
Posts: 15
Rep Power: 4 |
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: geometría general.JPG 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; } } ); // ************************************************************************* // 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); } } } } // ************************************************************************* // 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!" ami.JPG and the velocity field obtained in the rotating cellZone: cellzone rotating.JPG 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 |
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Tags |
ami patches, pimpledymfoam, rotating mesh |
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