What is a Computational Fluid Dynamics or CFD Grid?
A discretization scheme involves the breaking-down of the geometry into smaller parts (elements, volumes, points, etc.). The resulting discretized geometry which is now a group of several smaller computational regions is termed as a grid. The approximate formulations of the governing equations obtained through the different discretization schemes like FDM, FVM, FEM, etc., are solved on the discretized geometry or grid. As shown in the figure, the grid itself has more entities associated with it, namely, node, edge, face and cell. The definitions differ for two dimensional and three dimensional grids. Grids are generated using pre-processing software packages. Grids can be of different shapes as shown in the figure below: Grids can also be of different types based on the strategy of creation. They are classified as: 1. Structured Single block 2. Structured Multi block 3. Unstructured CFD solutions are best obtained on structured grids than unstructured grids. The structured grids allow
