NASA 1998 SBIR Phase I


PROPOSAL NUMBER: 98-1 07.03-1769

PROJECT TITLE: Implicit Unstructured Adaptive Mesh ALE Navier-Stokes Solver for Hypersonic Vehicle Simulation

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

ResearchSouth, Inc. proposes to develop computational fluid dynamics computer software for analysis / design of advanced airbreathing hypersonic vehicles. The problems addressed are: viscous high speed air flow over the exterior vehicle, viscous interactions during stage separation, combustion in the propulsion system, and mixing between the exhaust nozzle flow and the freestream. We will develop a general-purpose fluid flow analysis tool which gives the user the choice of inviscid Euler flow, viscous Navier-Stokes flow for laminar conditions, and turbulent flow with algebraic and k-e models. All of this capability will be operational for perfect-gases or equilibrium-air on unstructured, adaptive tetrahedral meshes with the Arbitrary-Lagrangian-Eulerian formulation for unsteady moving-body dynamics. The Phase I program will start with the SAMcfd code, an already proven technology, and proceed to develop an implicit Navier-Stokes solver for unstructured meshes, develop a set of preconditioners (initializers) for the GMRES technique to solve the non-linear equations, improve our existing Navier-Stokes meshing technique, add an equilibrium-air thermodynamics capability, perform a set of demonstration calculations for viscous flow over hypersonic vehicles, and document the project. This software will provide NASA with a powerful software tool to perform very efficient and rapid design assessment of evolving airbreathing hypersonic vehicle concepts.

POTENTIAL COMMERCIAL APPLICATIONS

The following are among the many commercial applications for the reacting Navier-Stokes software: (1) pollution dispersion from stacks of industrial processing plants; (2) modeling of viscous mixing processes for chemical manufacturing companies;(3) computation of exhaust flow from automobile and bus exhaust systems; (4) design of more efficient internal combustion engines; (5) fuel economy studies for commercial airplanes; (6) analysis of waste disposal systems; (7) design of air conditioning systems for large buildings; (8) air quality modeling for large-city streets

NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR

Lawrence W. Spradley
ResearchSouth, Inc.
555 Sparkman Dr. Suite 1612
Huntsville , AL 35816

NAME AND ADDRESS OF OFFEROR

ResearchSouth, Inc.
555 Sparkman Dr. Suite 1612
Huntsville , AL 35816