The first two steps are most labor consuming. Most often geometry is exported from a CAD package, and this process quite often results in problems, which are difficult for repairing. Volume mesh generation has been a research topic over many decades. Block-structured meshes allow for low memory usage due to the order of cells in the mesh. However, they are difficult to generate in complex geometries without sacrificing geometry details. This has motivated development of unstructured methods which are more automatic, but still require high quality input data. Recently, a novel class of methods, so called inside-out, became popular due to high level of automation, speed and simplicity.
Mesh templates: The implemented mesh templates are Cartesian (2D and 3D), hexahedral, tetrahedral, and polyhedral. Input geometry: Geometry is given as a surface triangulation. Patches are defined on the input geometry and transferred onto the volume mesh. Subsets (points, facets) are used for mesh generation, but are not transferred onto the volume mesh. Feature edges are defined by the user before volume meshing. Refinement settings: Refinement zones can be specified globally or locally. One can specify the maximum cell size, the number of refinement levels or the boundary cell size, and the refinement thickness. For local refinement one can u se patches, subset, edges and/or points. In addition, refinement zones can be specified by using primitive objects and/or auxiliary surface meshes. Finally, the automatic mesh refinement based on estimated feature size, curvature or other parameters is also available.īoundary layers: Boundary layers can be prescribed globally or locally by specifying the number of layers, the thickness ratio, the thickness of the first layer, or the total layer thickness. Gaps and thin features: Global and local options are available to preserve or remove cells in thin gaps. Parallelization: Multi-threading in mesh library is implemented by using OpenMP, which is supported by most modern C++ compilers. Graphical user interface: Software is built around a modern ribbon-based front-end with minimalistic set of buttons.
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