A PROGRAM MODULE FOR GENERATION OF CLOSED SURFACE TRIANGULAR GRIDS IN "LOGOS" SOFTWARE PACKAGE
V. A. Nikitin, A. V. Shurygin, I. G. Novikov, A. V. Egorov, S. S. Sokolov, A. I. Panov VANT. Ser.: Mat. Mod. Fiz. Proc 2021. Вып.2. С. 7079.
RFNCVNIIEF developed the "Logos" engineeringanalysis software package for the integrated simulation of a broad class of problems on a supercomputer with massive parallelism. A prepostprocessor with a set of generators, including a program module for the generation of a closed surface triangular grid is used when preparing initial data for codes. The main purpose of this grid generator is to eliminate defects in the surface grids to be imported to the prepostprocessor, from external grid formats as well. Possible defects include some peculiarities of surfaces such as superpositions, overlapping of triangular cells, "holes", "hanging" triangles and vertices, small dihedral angles between neighboring triangles, and degenerated triangles. The generator operation stages are described: 1) preprocessing of an original surface, 2) generation of a closed surface near the original one; 3) mapping of the closed surface to the original surface, 4) postprocessing of the resultant surface. The general description of the approaches used in each stage is given, as well as their effect on the final result is shown. Keywords: surface grid generator, closed surface triangular grid, vacuum packaging method, the "Logos" software package.
