QUALITY IMPROVEMENT OF THE FACETS OF 3D CELLS WHEN GENERATING UNSTRUCTURED MESHES IN "LOGOS" SOFTWARE PACKAGE
O. N. Borisenko, M. V. Kuzmenko, M. V. Cherenkova, A. G. Giniyatullina, N. V. Chukhmanov, D. N. Smolkina, T. E. Timaeva, K. A. Blazhnova
VANT. Ser.: Mat. Mod. Fiz. Proc 2022. Вып.3. С. 73-85.
The ways to improve the quality of the facets of 3D cells in case of automatic generation of unstructured meshes in "Logos" software package are described; they are used in numerical simulation of the problems of aero- and hydrodynamics. This is a modification of cells with partially coinciding facets, integration of facets with the account for their shape, cutting of the curved facets, cutting of not-convex facets with adding a new node having a possibility to delete a small edge, cutting of the curved facets into the multiple plane ones in the transfer regions of the not-smooth regions into the smooth area, and deleting extra nodes. Implementation of the integrity of these ways allows improving the shape of the facets of the cells produced by the cutting-off method and, as a result, the layer of the cells generated on their basis, where a strong flow velocity gradient is characteristic. Eventually, the quality of the computational mesh in general is improved. Keywords: "Logos" software package, unstructured meshes, mesh quality improvement, surface facets, boundary layer.
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