题目：Unstructured Mesh Generation and Its Applications
报告人：斯航研究员，Weierstrass Institute for Applied Analysis and Stochastics (WIAS) in Berlin, Gernmany
报告摘要：Analytic solutions for most PDEs are known only for some simple domains, such as a circle, square, or sphere. In order to obtain solutions for more realistic domains, numerical approximations such as the finite element method (FEM) and finite volume methods (FVM) are used. Mesh generation is a key step prior to these numerical methods. It is itself an active research topic with background in mathematics, computer science, and engineering. Apart
from numerical solution of PDEs, its applications are numerous and have practical uses in fields such as archaeology, cinematography and robotics. In this talk, we will begin with triangle mesh generation and adaptation in the plane. This problem has been well studied. Efficient algorithms are developed. We will then move to tetrahedral mesh generation in 3d, which is
still challenged by many theoretical and practical issues. In this talk, we will highlight some recent development in this field.
报告人概况：Dr. Hang Si is a senior researcher in Weierstrass Institute for Applied Analysis and Stochastics (WIAS) in Berlin, Gernman. Hang Si got his B.S. in Electrical Engineering in Hangzhou University (now merged in Zhejiang University) in 1994, and got his M.S. in Computer Science in Zhejiang University in 2002. He joined the research group "Numerical Mathematics and Scientific Computing" of WIAS in 2002. He received his Ph.D from the Institute of Mathematics of Technische Universitaet Berlin in 2008. His main research is mesh generation and the discrete and computational geometry problems behind it. Dr. Hang Si is best known for his work in 3d tetrahedral mesh generation. He developed the software, TetGen, a Delaunay tetrahedral mesh generator. It is freely available for academic use (http://www.tetgen.org). TetGen is one of the most popular 3d meshing codes. Its users are from all over the world. It has been included in many commercial softwares in feilds of computer graphics, animation, games, and finite element simulations. Hang Si received the Software Prize of the Symposium on Geometry Processing (GMP) in 2012. Hang Si has been the vice chair of two well-known international mesh generation conferences, 25th International Meshing Roundtable (2016, Austin TX, USA), and 9th Numerical Grid Generation (2018, Moscow, Russia).