Overset Grid Generation and CFD using Pointwise, Suggar++, and Caelus

The overset grid approach is a powerful technology that streamlines simulations that have complex geometries and/or regions in motion. Individual component grids are fitted to portions of the geometry without requiring point matching to other grids. Domain connectivity information (DCI) couples the overlap regions by providing interpolation sources and removing cells that are to be excluded from the computation. The DCI is computed by Suggar++, developed by Celeritas Simulation Technology. Suggar++ is a flexible, overset grid assembly (OGA) package available commercially worldwide.

While the benefits for dynamic grids are obvious, the overset approach can be advantageous for static grids as well because geometry changes require only local changes to the grid system. This flexibility simplifies design studies as new or perturbed geometry can easily be incorporated by only meshing the changed feature. Because the baseline grid system is not altered, changes in the solution are more reflective of the local geometry change rather global grid updates.

The process of generating overlapping grids, setting up and executing Suggar++, and exporting the DCI along with the grid system can all be accomplished within Pointwise. In this webinar, we will highlight several best practices for generating component grids and the procedure for setting up the necessary inputs for Suggar++. Finally, we will demonstrate an overset flow simulation using Caelus, a freely available fork of OpenFOAM developed by Applied CCM.

Discover how to:

• Generate overlapping grids with Pointwise
• Set up Suggar++ to perform the overset grid assembly
• Visualize and diagnose the resultant composite grid in Pointwise
• Perform an overset flow simulation using Caelus