Best Practices for Overset Meshing

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


Travis Carrigan, Pointwise, Inc.

Travis Carrigan

Pointwise, Inc.

Travis Carrigan joined Pointwise as a senior engineer after completing his M.S. in aerospace engineering at The University of Texas at Arlington in May 2011 where his graduate research involved aerodynamic design optimization. Currently, as Manager of Technical Sales, Mr. Carrigan works with prospective customers and demonstrates how Pointwise software can be used to improve their CFD process. He also produces technical marketing content and works with customers and software partners to demonstrate best practices in grid generation, solver setup, and solution post-processing for a variety of industries.

Ralph Noack, Celeritas Simulation Technology, LLC

Ralph Noack

Celeritas Simulation Technology, LLC

Dr. Ralph Noack is the president of Celeritas Simulation Technology, LLC and the primary developer of Suggar++. He has been developing CFD solver, grid generation, and overset technology for 35 years. The last 15 years he has been developing Suggar++ and related software. He is now solely focused on developing and supporting Suggar++ and continuing to make it the premier overset capability in the world.

Dr. Chris Sideroff, Applied CCM Canada

Chris Sideroff, Ph.D.

Applied CCM Canada

Dr. Sideroff has an extensive background in modeling a range of complex aerospace and turbomachinery flows and has led the planning, implementation, and support of several high-performance computing (HPC) clusters. He is the managing director and principle research engineer at Applied CCM Canada, a company providing development, technical support and training for open source based CFD software such as Caelus and OpenFOAM. Applied CCM Canada became a distributor of Pointwise beginning in 2015. Dr. Sideroff’s current research interests are automation methods for CFD mesh generation, more robust discretization schemes for highly anisotropic and skewed meshes for finite volume based CFD solvers, work flow automation (pre, solve, post) with interpreted programming languages such as Python, and overset grid technologies. He earned his mechanical engineering B.Sc and M.Sc from the University of Alberta in Edmonton, Canada and Ph.D. degree from Syracuse University in Syracuse, USA.