f4ac5f8748
AMIInterpolation and cyclicAMI have been superseded by patchToPatch and
nonConformalCoupled, respectively.
The motivation behind this change is explained in the following article:
https://cfd.direct/openfoam/free-software/non-conformal-coupling/
Information about how to convert a case which uses cyclicAMI to
nonConformalCoupled can be found here:
https://cfd.direct/openfoam/free-software/using-non-conformal-coupling/
83 lines
3.5 KiB
Plaintext
83 lines
3.5 KiB
Plaintext
Overview
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========
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+ Template case for rotating geometry flow with single inlet and outlet
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+ Can be used for MRF or NCC simulations.
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+ Setup to run the incompressibleFluid solver module for MRF or NCC
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+ The case is designed to be meshed with snappyHexMesh
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+ snappyHexMesh is setup to use 3 trisurface files
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+ fixed.obj: CAD of the stationary (external) geometry
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+ rotating.obj: CAD of the rotating geometry
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+ rotatingZone.obj: CAD of surface bounding the rotating region
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+ Copy the *.obj files to the constant/geometry directory
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+ The fixed.obj should contain an inlet and outlet region to create the relevant
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patches in the mesh
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Background Mesh
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===============
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+ The blockMeshDict file contains a configuration for a cylindrical background
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mesh aligned along the z-axis
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+ The mesh includes a core box-shaped block and inner and outer cylinders
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+ The backgroundMesh subdictionary includes key geometric parameters of the mesh
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+ The inner cylinder relates to the rotatingZone.obj
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+ The outer cyliner relates to the external boundary, e.g. fixed.obj
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+ Set the radii of inner and outer cylinders to ~2% larger than respective OBJ
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files
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+ The background mesh can define the external boundary by uncommenting
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entries, e.g. inlet, in the boundary section of blockMeshDict
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+ Set background mesh density with boxCells, inCells, outCells and zCells
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+ Run blockMesh
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+ NOTE: An alternative blockMeshDict-box file exists if the user wants a regular
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box-shaped background mesh, similar to set up in the inflowOutflow template
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Features
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========
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+ Run surfaceFeatures to extract features for explicit feature capturing
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Castellated Mesh
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================
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+ In the snappyHexMeshDict file, replace <inletPatch> with the name of the inlet
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region in the fixed.obj file, if it defines the external boundary
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+ Replace <outletPatch> with the name of the outlet region
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+ run snappyHexMesh to obtain a castellatedMesh
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+ Review the mesh; modify refinement levels and regenerate the mesh as required
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(levels are set in refinementSurfaces and refinementRegions)
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Snapped Mesh
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============
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+ In snappyHexMeshDict, set castellatedMesh off; snap on;
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+ Run the snapping phase of snappyHexMesh
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+ Review the mesh
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Layers
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======
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+ To add layers to the mesh along wall boundary patches...
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+ Switch on addLayers; switch snap off;
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+ Run snappyHexMesh
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+ The number of layers can be changed by modifying nSurfaceLayers
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Initialisation
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==============
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+ In the field files in the 0 directory, set inlet values
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+ For example, in 0/U, set the inlet velocity Uinlet
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+ Set the viscosity in constant/transportProperties
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+ Rotating properties are set in constant/rotatingZoneProperties
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+ For MRF, this file is included from constant/MRFProperties
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+ For NCC, this file is included from constant/dynamicMeshDict
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+ Ensure settings are appropriate in controlDict, fvSchemes, fvSolution, for
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relevant simulation; for NCC, in particular, ensure that deltaT, ddtSchemes
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and relaxationFactors are set for transient simulation
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NCC Simulation
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==============
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+ After the mesh is generated, the couple must be created at the boundary
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of the rotatingZone
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+ createBaffles must first be run to generate two non-coupled patches from
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the faces in the faceZone bounding the rotatingZone, e.g. by
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createBaffles -overwrite
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+ splitBaffles must then be run to duplicate the vertices shared by the
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non-coupled patches to enable them to move independently, e.g. by
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splitBaffles -overwrite
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+ createNonConformalCouples must then be run to generate the couple patches
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required by NCC, e.g. by
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createNonConformalCouples -overwrite
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