02-18-2014 11:00am - noon NIA Room 101

Evaluation of Multigrid Solutions for Turbulent Flows

A multigrid methodology has been recently developed in a NASA solver, FUN3D, and successfully applied for a wide range of turbulent flows, from simple two-dimensional geometries to realistic three-dimensional configurations. The methodology is applicable to structured- and unstructured-grid solutions and includes both regular and agglomerated coarse meshes. Significant speed-ups over single-grid computations have been demonstrated. In the current work, we report on a detailed evaluation of the solver performance in computing benchmark turbulent flows. For those benchmark computations, multigrid solutions are compared with the corresponding single-grid solutions in terms of time-to-solution characteristics measured in the same computing environment. Multigrid efficiency enables a grid-refinement study of a turbulent flow around an airfoil that is discussed in detail. This talk is an extended version of the talk presented at AIAA SciTech-2014 conference.

Speaker Bio: Dr. Boris Diskin is Research Fellow at NIA. He earned Ph.D. in Applied Mathematics at The Weizmann Institute of Science, Israel in 1998. He was a Senior Research Scientist at ICASE and joined NIA from its inception in 2003. His area of expertise is adjoint-based optimization and grid adaptation methods, finite-volume discretizations, and multigrid methods.