Overlapping grid and computational fluid dynamics solution for a moving 3-D valve. The image on the left shows a cut-away view of the component grid surfaces for the valve, valve seat, and the flow chamber. The figure on the right shows an incompressible flow solution in this geometry. Mappings define transformations such as curves, surfaces, areas and volumes. These are used to represent the geometry of the computational domain.
Grids define a discrete representation of a mapping or mappings.
These include single grids and collections of grids, in particular composite overlapping grids. The Ogen overlapping grid generator provides tools for the construction of curvilinear grids, and for overlapping those grids to represent complex moving geometries. Operators provide discrete representations of differential operators and boundary conditions through finite difference or finite volume approximations. Visualization tools based on OpenGL are provided to furnish a high-level graphics interface for visualizing geometry and simulation results. Adaptive mesh refinement provides automatic refinement of the overlapping grid structure for increased local resolution and efficiency of computational simulations.