NASA STTR 2008 Solicitation


PROPOSAL NUMBER: 08-1 T7.01-9911
RESEARCH SUBTOPIC TITLE: Predictive Numerical Simulation of Rocket Exhaust Interactions with Soil
PROPOSAL TITLE: High-Fidelity Gas and Granular Flow Physics Models for Rocket Exhaust Interaction with Lunar Soil

NAME: CFD Research Corporation NAME: University of Florida
STREET: 215 Wynn Drive, 5th Floor STREET: P.O. Box 116550 (339 Weil Hall)
CITY: Huntsville CITY: Gainesville
STATE/ZIP: AL  35805 - 1944 STATE/ZIP: FL  32611 - 6550
PHONE: (256) 726-4800 PHONE: (352) 392-9448

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Peter Liever
215 Wynn Drive, 5th Floor
Huntsville, AL 35805 - 1944
(256) 726-4858

Expected Technology Readiness Level (TRL) upon completion of contract: 4

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
Soil debris liberated by spacecraft landing on the lunar surface may damage and contaminate surrounding spacecraft and habitat structures. Current numerical simulations of these events lack credibility because lunar environment complexities have never been captured in suitable models: the mixed rarefied-continuum nature of the plume's surface layer flow, and the highly irregular soil particle shapes with peculiar granular stresses, particle aerodynamics, and particle collision characteristics. CFDRC and the University of Florida (UF) propose to apply their uniquely capable simulations simulation tools to derive credible lunar gas and granular flow physics sub-models from first principles. CFDRC's unified continuum-rarefied flow solver will be applied to characterize the surface layer flow structure and assess interference effects from surface craters and rocks. The code's unique ability to resolve highly irregular shapes with an automated adaptive Cartesian approach will be applied to compute realistic particle aerodynamics. A Lagrangian particle collision model developed for efficiently simulating dense particle streams will characterize particle collision and dispersion effects. A novel fundamental soil model developed by UF to describe all constituent stresses in a single fundamental model for arbitrary particle shapes mixtures will be applied. Phase I will demonstrate the unique capabilities of the proposed simulation tools. During Phase II, these tools will be applied to create high fidelity physics sub-models for integration in current erosion simulation models.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
The debris simulation tool will be of first order importance to the Space Exploration program for lunar robotic and human mission architecture definition. The tool will be equally applicable to follow-on Mars robotic and human missions. The developed technology will also be applicable for analysis of solid propulsion systems with embedded solid particle

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
Many potential non-NASA commercial applications exist in civil and military industries. Dust, sand and snow stir-up during helicopter landing and take-off in a desert or artic environment result in severe visibility impairment (brown-out), windshield abrasion and danger of debris ingestion. Civil engineering and environmental engineering applications include wind-borne landscape erosion and dust transport to populated areas.

NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.

Fundamental Propulsion Physics
Software Tools for Distributed Analysis and Simulation
Testing Requirements and Architectures

Form Generated on 11-24-08 11:59