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- although this has been supported for many years, the tutorials continued to use "convertToMeters" entry, which is specific to blockMesh. The "scale" is more consistent with other dictionaries. ENH: - ignore "scale 0;" (treat as no scaling) for blockMeshDict, consistent with use elsewhere.
Overview ======== + Template case for rotating geometry flow with single inlet and outlet + Can be used for MRF or AMI simulations + Setup to run the simpleFoam solver for MRF, pimpleDyMFoam for AMI + The case is designed to be meshed with snappyHexMesh + snappyHexMesh is setup to use 3 trisurface files + fixed.obj: CAD of the stationary geometry + rotating.obj: CAD of the rotating geometry + rotatingZone.obj: CAD of surface bounding the rotating region + Copy the *.obj files to the constant/triSurface directory + The fixed.obj should contain an inlet and outlet region to create the relevant patches in the mesh Background Mesh =============== + The blockMeshDict file contains a configuration for a cylindrical background mesh aligned along the z-axis + The mesh includes a core box-shaped block and inner and outer cylinders + The backgroundMesh subdictionary includes key geometric parameters of the mesh + The inner cylinder relates to the rotatingZone.obj + The outer cyliner relates to the external boundary, e.g. fixed.obj + Set the radii of inner and outer cylinders to ~2% larger than respective OBJ files + The background mesh can define the external boundary by uncommenting entries, e.g. inlet, in the boundary section of blockMeshDict + Set background mesh density with boxCells, inCells, outCells and zCells + Run blockMesh + NOTE: An alternative blockMeshDict-box file exists if the user wants a regular box-shaped background mesh, similar to set up in the inflowOutflow template Features ======== + Run surfaceFeatureExtract to extract features for explicit feature capturing Castellated Mesh ================ + In the snappyHexMeshDict file, replace <inletPatch> with the name of the inlet region in the fixed.obj file, if it defines the external boundary + Replace <outletPatch> with the name of the outlet region + run snappyHexMesh to obtain a castellatedMesh + Review the mesh; modify refinement levels and regenerate the mesh as required (levels are set in refinementSurfaces and refinementRegions) Snapped Mesh ============ + In snappyHexMeshDict, set castellatedMesh off; snap on; + Run the snapping phase of snappyHexMesh + Review the mesh Layers ====== + To add layers to the mesh along wall boundary patches... + Switch on addLayers; switch snap off; + Run snappyHexMesh + The number of layers can be changed by modifying nSurfaceLayers Initialisation ============== + In the field files in the 0 directory, set inlet values + For example, in 0/U, set the inlet velocity Uinlet + Set the viscosity in constant/transportProperties + Rotating properties are set in constant/rotatingZoneProperties + For MRF, this file is included from system/fvOptions + For AMI, this file is included from constant/dynamicMeshDict + Ensure settings are appropriate in controlDict, fvSchemes, fvSolution, for relevant simulation; for AMI, in particular, ensure that deltaT, ddtSchemes and relaxationFactors are set for transient simulation