tailieunhanh - Báo cáo nghiên cứu khoa học: "Development of a software package for 3D structured mesh generation"

Một cấu trúc thế hệ lưới 3D gói đã được phát triển sử dụng nội suy transfinite (TFI) và / hoặc các phương pháp lưới elip thế hệ để tạo ra các mắt lưới có cấu trúc 3D cho lĩnh vực tính toán xung quanh khu vực 3D (đối tượng). | VNU Journal of Science Mathematics - Physics 26 2010 93-106 Development of a software package for 3D structured mesh generation Duong Ngoc Hai Nguyen Tat Thang Institute of Mechanics Vietnam Academy of Science and Technology VAST Received 3 April 2010 Abstract. A 3D structured-mesh generation package has been developed using the transfinite interpolation TFI and or the elliptic mesh generation methods to generate 3D structured meshes for the computational domain surrounding 3D regions objects . A boundary stretching coefficient was used in the first method. And an attraction function was used in the second one. These stretching coefficient and attraction function are used to control the properties . the distribution density of the mesh points of the meshes to be generated. The mesh generation function of the package is tested and shows its robustness. In addition a friendly graphic user interface has also been designed and developed to assist in viewing and presenting the topographic data and the generated meshes. The package has been applied to the generation of 3D computational meshes used as the input of a computational fluid dynamics model for simulations of turbulent compressible atmospheric flows and air pollutant transport dispersion in practical 3D domains. Keywords Mesh generation Grid generation Transfinite interpolation TFI Elliptic mesh grid generation Graphic user interface. 1. Introduction In computational fluid dynamics CFD mesh generation techniques for generating computational meshes used in numerical models have long been developed 1 in scientific literature the technical terms computational mesh and grid are used interchangably . There are two types of computational meshes structured meshes and unstructured ones used in the discretization of the governing equations. The structured meshes whose connectivity between meshes is regular and fixed are used widely in finite difference methods. On the other hand unstructured meshes are usually .