Volume Meshing: MeshGems-Hexa

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MeshGems-Hexa is a fully automated all-hex mesh generator.

• Input: a discrete triangulated surface mesh
• Output: a quad surface mesh that captures the input geometry features, but does not preserve its topology, and an inner hex mesh

The generated meshes are all hexes (no prisms, pyramids, nor tets), conformal (no hanging nodes) and all elements have a positive volume. MeshGems-Hexa is fully automatic and requires only a few parameters to control the generated mesh.

MeshGems-Hexa Highlights

• Based on the Octree method
• Handles multiple surface and volume subdomains as well as non-manifold geometries. All subdomains are meshed together in one go: the user can select afterwards which part of the final mesh is of interest
• Does not preserve the input geometry topology: but, some features can be enforced in the output mesh such as surface edges or vertices
• Adaptive capabilities: the size of the inner elements can be controlled through an input size map throughout the whole meshed space
• Boundary layers generation for CFD purposes: user-given number of layers and sizes and blending layers automatically added to lower the size shock between the last boundary layer elements and the free mesh
• Fast: millions of hexes per minute. Multi-threading optimization. Experimental Open-CL version available, taking advantage of GPUs computing power
• Minimum and maximum element sizes can be controlled, overriding any geometrical or size map requirements
• User control between
  • the “quality mode”, that enforce a minimum quality for each hexes at the expense of geometric accuracy, and
  • the “geometry mode”, that enforce a better capturing of the input mesh features but can generate a small percentage of negative volume elements on the way