ees16/lagrit repository overview

⁠LaGriT

LaGriT (Los Alamos Grid Toolbox) LA-CC-15-069 is a library of user callable tools that provide mesh generation, mesh optimization and dynamic mesh maintenance in two and three dimensions. LaGriT is used for a variety of geology and geophysics modeling applications including porous flow and transport model construction, finite element modeling of stress/strain in a variety of systems.

Geometric regions for LaGriT are defined as combinations of bounding surfaces, where the surfaces are described analytically or as tessellated surfaces (triangles and/or quadrilaterals). A variety of techniques for distributing points within these geometric regions are provided. Mesh connectivity uses a Delaunay tetrahedralization algorithm that respects material interfaces. The data structures created to implement this algorithm are compact and powerful and expandable to include hybrid meshes (tet, hex, prism, pyramid, quadrilateral, triangle, line) however the main algorithms are for triangle and tetrahedral Delaunay meshes.

Mesh refinement, derefinement and smoothing are available to modify the mesh to provide more resolution in areas of interest. Mesh refinement adds nodes to the mesh based on geometric criteria such as edge length or based on field variable shape. Mesh smoothing moves nodes to adapt the mesh to field variable measures, and, at the same time, maintains quality elements.

LaGriT has three modes of use, 1) command line 2) batch driven via a control file 3) calls from C/Fortran programs. There is no GUI interface.

⁠ DOCUMENTATION

https://lanl.github.io/LaGriT/⁠