Unified Methodology for Simulation of Continuum and Rarefied Flows

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: W9113M-09-C-0144
Agency Tracking Number: B083-034-0621
Amount: $99,924.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: MDA08-034
Solicitation Number: 2008.3
Small Business Information
2317-A Market Place, Huntsvillle, AL, 35801
DUNS: 363342069
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Edward Kansa
 Staff Scientist
 (256) 270-0956
Business Contact
 Tatiana Shvetsova
Title: Business Officer
Phone: (256) 270-0956
Email: ts@comscis.com
Research Institution
We propose to develop a stand-alone computational module for seamlessly extending the validity of continuum CFD codes into transitional and rarefied flow regimes. The module will be designed for implementation in to existing legacy codes for use in characterization of high altitude plume flows. The approach is based on a novel, regularized set of Navier-Stokes equations (RNS) that is extended to account for kinetic effects (intermediate Knudsen number, fluctuations) in the continuum approximation. RNS has several important features not found in classical NS equations that are of direct relevance high altitude plume flows: (a) Natural accounting of both continuum and rarefied gas flow regimes; and (b) Kolmogorov-scale field fluctuations resulting from a mathematical model that accounts for turbulent diffusion in a natural manner that allows direct simulation of phenomena such as laminar-turbulence transition and wall slip effects. Phase I will focus on development of a stand-alone, computational module prototype incorporating the RNS approach. The module will be connected to a characteristics-based high order compressible flow code with particle transport capabilities and will be exercised and evaluated against experimental data for a model problem that contains elements of both continuum and rarefied flows. Phase II will couple the module to flow and radiation codes used by MDA.

* Information listed above is at the time of submission. *

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