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Mesh quality visualization

  • Any problematic face/cell inside the mesh can be visualized in ParaView.
  • checkMesh utility automatically generate face/cell sets which can be visualized.
  • By increasing maxNonOrtho to 45 and maxInternalSkewness to 46 in snappyHexMeshDict, a mesh with some quality fails can be generated.
  • In ParaView sets can be visualized:
    • 43 – run paraFoam, load the mesh, check Include Sets and choose a set
    • 44 – windows ParaView reader cannot load sets, therefore first convert sets to zones:
      # setsToZones -noFlipMap -time 3
      run ParaView, check Read zones, enable Multi-block Inspector (View -> Multi-block Inspector) and in Multi-block Inspector choose a set
  • Additionally, advanced tools for mesh analysis can be enabled in SnappyHexMeshDict:
    // Advanced
    // Debug flags
    // debugFlags
    // (
    //    mesh            // write intermediate meshes
    //    intersections   // write current mesh intersections as .obj files
    //    featureSeeds    // write information about explicit feature edge
    //                    // refinement
    //    attraction      // write attraction as .obj files
    //    layerInfo       // write information about layers
    // );
    // Write flags
    // writeFlags
    // (
    //    scalarLevels    // write volScalarField with cellLevel for postprocessing
    //    layerSets       // write cellSets, faceSets of faces in layer
    //    layerFields     // write volScalarField for layer coverage
    // );
  • Any block and its flag can be uncommented. I enables additional outputs of snappyHexMesh utility.
  • Give it a try – uncomment writeFlags block and visualize the fields, e.g., boundary layer thickness (see Figure [*]).

Figure: Boundary layer thickness visualization.