ABSTRACT
Grid generation plays an important part in CFD. Grids should represent geometry properly, including boundaries where boundary conditions are applied. The grid plays a major role in the convergence rate, solution accuracy and computational efforts required. Grid quality is very important for obtaining a good solution. Chapter 10 deals with various types of grids and their classification and briefly discusses body-fitted grids, adaptive grids and mesh quality. A short introduction to grid generation methods for structured and unstructured grids is also provided. Algebraic and differential equation methods of structured grid generation, along with their merits and demerits, are discussed. Although the structured grid is most desirable, for complex geometries, grid generation with structured grids requires more computational efforts than flow computations. The use of unstructured grids can considerably reduce computational efforts for grid generation. For local mesh refining or adaptive meshes, use of unstructured grids is very useful. For unstructured grid generation, providing connectivity information is cumbersome. This chapter presents unstructured grid generation using triangulation by the advanced-front technique and the Delaunay-based method.
