Divert & Attitude Control Solid Propellant Jet Interactions Modeling

Period of Performance: 11/18/1999 - 11/18/2001


Phase 2 SBIR

Recipient Firm

Combustion Research & Flow Technology
6210 Keller's Church Road Array
Pipersville, PA 18947
Principal Investigator

Research Topics


This project addresses the specialization and upgrade of unstructured CFD numerics for the simulation of missile aerodynamic flowfields with lateral/divert jet interactions. Starting unstructured capabilities are advanced and include gas-phase chemical kinetics and two-equation turbulence modeling in an upwind/implicit (Roe-TVD/GMRES) framework that operates in a parallel environment (domain decomposition/MPI) and includes multiple elements (tets, hexes, prisms, etc.). Principal Phase II upgrades will include multi-element solution adaptive gridding based on the recent tet adaptation work of Baker. Other upgrades will include explicit algebraic stress model (EASM) turbulence extensions, nearwall modeling catering to separated flows, and advanced thermal species transport using scalar fluctuation equations. Detailed comparisons with fundamental lateral jet flow data will be performed and methodology for inclusion of turbulent/particle and turbulent/combustion interactions will be made operational. Kinetics can strongly influence thrust amplifications and new procedures will be incorporated to provide reduced CPU times without sacrificing accuracy. Methodology for treating dynamic pressure loads produced by direct jet interactions will also be formulated. Detailed studies of AlT missile systems at low altitudes (15, 30, 45km) will be performed to demonstrate and assess the new methodology. BENEFITS: This research provides for unstructured numerics to solve very complex missile system aerodynamic flows efficiently. Benefits to the missile community are a highly improved tool which can support design and system assessment studies. Commercial applications include the licensing of specialized software (for grid adaption and flowfield); expanding our customer support role to include a multitude of jet control problems outside the missile community; and, product design for noise reduction using lateral jet based active controls.