TetrUSS is an unstructured-grid flow analysis and design computational fluid dynamic (CFD) software system. The goal is to provide a validated capability to non-CFD expert users for performing rapid aerodynamic analysis and design of complex configurations.

The system consists of a loosely coupled set of software for geometry setup, grid generation, flow solution, and analysis.

TetrUSS is used in aerodynamics and fluid dynamics analysis, and has been used on major projects including High Speed Research / High Speed Civil Transport, Hyper-X, Abrupt Wing Stall, Mars Scout, Joint Strike Fighter and more. What's more, the software has been used in the civilian aerospace industry, academy, automotive, biomedical and civil engineering fields.

TetrUSS is available free-of-charge to U.S. entities, citizens, and permanent residents. In addition, a free 1-week TetrUSS training course is available monthly at NASA Langley Research Center, and is strongly recommended.