Geometry

Table of Contents

The geometry dictionary describes all input geometry required by snappyHexMesh:

  • the surface to conform to, e.g. triangulated surfaces and analytical shapes
  • regions for volumetric or surface refinement
  • setting constraints on internal faces to generate face sets or face zones for regions

The geometry section can describe triangulated surfaces or searchable objects. A simple definition may take the form: 

geometry
{
    sphere.stl  // name of the geometrical entity
    {
        type            triSurfaceMesh;
    }

    myBox       // name of the geometrical entity
    {
        type            searchableBox;
        min             (1.5 1 -0.5);
        max             (3.5 2 0.5);
    }
};

Triangulated surfaces

Triangulated surfaces must be located in the $FOAM_CASE/constant/triSurface directory. The following formats are supported:

  • stl - Stereolithography ASCII
  • stlb - Stereolithography binary
  • obj - Wavefront object
  • vtk - Legacy Visualisation Toolkit (VTK)
  • ftr - OpenFOAM triangulated format
  • ac, smesh, tri and dx

Some formats support multiple regions, e.g. 'SOLID' in the stl format. Each surface and region in a surface becomes a separate patch in the final mesh.

Searchable objects

These objects define analytical shapes, and are treated similarly to triangulated surfaces, e.g. to define the geometry to mesh or refinement regions.

Options:

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