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
Socially and Economically Disadvantaged:
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.

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