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Tutorial case

  • The tutorial case can be found in the materials inside the training/run/snappyTestCase directory.
  • The directory contains a preset case for mesh generation of a simple geometry:
    snappyTestCaseCase directory
     constant 
          polyMeshOpenFOAM mesh data
              blockMeshDictDictionary for blockMesh utility
          triSurfaceDirectory including inputs for snappyHexMesh
              C-fine.stl
              D-fine.stl Surface geometry files
              F-fine.stl
     system 
              controlDict
              fvSchemes Compulsory files
              fvSolution
              snappyHexMeshDictSnappyHexMesh mesh parameters
              surfaceFeatureExtractDictDictionary for generation of geometry edges
     snappyEvolution.mp4All the intermediate steps visualization
  • Additional files and folders for meshing:
    • triSurface directory holds the input geometry. SnappyHexMesh always looks into this directory.
    • snappyHexMeshDict is a dictionary for snappyHexMesh inlucding all the mesh and algorithm parameters.
    • surfaceFeatureExtractDict is a dictionary for surfaceFeatureExtract utility by which edges of input geometry can be generated.
  • The input geometry for this case consists of three letter-shaped objects – C, F and D (see Figure [*]).

Figure: Input geometry, three letters – C.stl, F.stl and D.stl.

  • This tutorial is explaining the most important parameters for generating a computational mesh.

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Geometry & Mesh

All following Turbo Blade Post usage examples are presented on a numerical results from a simulation of an incompressible flow in a pump. The boundary geometry of the simulated volume of the pump is shown in the figure [*]. The meshing and calculation has been done by TCFD / CFD Processor using the OpenFOAM package. The resulting meshes are displayed in the figures [*] and [*]. Numerical results are illustrated in the figures [*] and [*]. These are classical visualisations from ParaView. Turbo Blade Post offers several new ways how to inspect the numerical data, which are presented in the following chapters.

Figure: Geometry of the TCFD tutorial pump used in this examples.

Figure: Computational mesh in the rotor MRF (rotating) zone as generated by TCFD using the snappyHexMesh mesher.

Figure: Computational mesh in the rotor MRF (rotating) zone as generated by TCFD using the snappyHexMesh mesher.

Figure: Static pressure field in the pump. The incompressible simulation has been done by TCFD using OpenFOAM.

Figure: Relative velocity streamlines in the rotating part (MRF zone) of the mesh. The incompressible simulation has been done by TCFD using OpenFOAM.