HYPERSONIC ANALYSIS FOR VEHICLES IN THE CONTINUUM-TRANSITIONREGIME

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$49,925.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
17157
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Amtec Engineering Inc
3055 112th Ave Ne, #208, Bellevue, WA, 98004
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Scott T Imlay
(206) 827-3304
Business Contact:
() -
Research Institution:
n/a
Abstract
SEVERAL AEROSPACE VECHICLES ARE CURRENTLY BEING CONSIDERED THAT HAVE A SIGNIFICANT PORTION OF THEIR FLIGHT PATH IN THE UPPER REACHES OF THE ATMOSPHERE. THE FLOW ABOUT THESE VEHICLES IS IN THE CONTINUUM-TRANSITION REGIME WHERE THE STANDARD EQUATIONS OF CONTINUUM FLOW, THE NAVIER-STOKES EQUATIONS, BEGIN TO FALL. THIS PROJECT WILL MODIFY THE HANA CODE, AN EXISTING NAVIER-STOKES CODE FOR THE ANALYSIS OF HYPERSONIC VEHICLES TO SOLVE THE BURNETT EQUATIONS WITH COUPLED, ROTATIONAL NONEQUILIBRIUM. THE BURNETT EQUATIONS ARE MORE ACCURATE THAN THE NAVIER-STOKES EQUATIONS FOR LOW-DENSITY FLOWS WITH FINITE THICKNESS SHOCKS. SOLUTIONS TO THE BURNETT EQUATIONS HAVE ONLY RECENTLY BEEN OBTAINED FOR THE HYPERSONIC FLOWS. THE PHASE I INVESTIGATION WILL DETERMINE THE VIABILITY OF SOLVING THE BURNETT EQUATIONS WITH COUPLED, ROTATIONAL, NONEQUILIBRIUM AND SURFACE-SLIP BOUNDARY CONDITIONS WITHIN THE HANA CODE. IN PARTICULAR, THE RAMIFICATIONS OF USING UPWIND DIFFERENCING OF THE INVISCID FLUXES AND DIAGONALIZED VISCOUS JACOBIANS IN THE LU-SGS IMPLICIT METHOD WILL BE STUDIED. THE PROPER IMPLEMENTATION OF SURFACE-SLIP BOUNDARY CONDITIONS WILL ALSOBE CONSIDERED. SEVERAL AEROSPACE VECHICLES ARE CURRENTLY BEING CONSIDERED THAT HAVE A SIGNIFICANT PORTION OF THEIR FLIGHT PATH IN THE UPPER REACHES OF THE ATMOSPHERE. THE FLOW ABOUT THESE VEHICLES IS IN THE CONTINUUM-TRANSITION REGIME WHERE THE STANDARD EQUATIONS OF CONTINUUM FLOW, THE NAVIER-STOKES EQUATIONS, BEGIN TO FALL. THIS PROJECT WILL MODIFY THE HANA CODE, AN EXISTING NAVIER-STOKES CODE FOR THE ANALYSIS OF HYPERSONIC VEHICLES TO SOLVE THE BURNETT EQUATIONS WITH COUPLED, ROTATIONAL NONEQUILIBRIUM. THE BURNETT EQUATIONS ARE MORE ACCURATE THAN THE NAVIER-STOKES EQUATIONS FOR LOW-DENSITY FLOWS WITH FINITE THICKNESS SHOCKS. SOLUTIONS TO THE BURNETT EQUATIONS HAVE ONLY RECENTLY BEEN OBTAINED FOR THE HYPERSONIC FLOWS. THE PHASE I INVESTIGATION WILL DETERMINE THE VIABILITY OF SOLVING THE BURNETT EQUATIONS WITH COUPLED, ROTATIONAL, NONEQUILIBRIUM AND SURFACE-SLIP BOUNDARY CONDITIONS WITHIN THE HANA CODE. IN PARTICULAR, THE RAMIFICATIONS OF USING UPWIND DIFFERENCING OF THE INVISCID FLUXES AND DIAGONALIZED VISCOUS JACOBIANS IN THE LU-SGS IMPLICIT METHOD WILL BE STUDIED. THE PROPER IMPLEMENTATION OF SURFACE-SLIP BOUNDARY CONDITIONS WILL ALSOBE CONSIDERED.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government