Effect of bulk viscosity in low density, hypersonic blunt body flows

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6514470

Rutledge, W H ^[1]; Hoffmann, K A ^[2]

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1. Sandia National Labs., Albuquerque, NM (USA)
2. Texas Univ., Austin, TX (USA)

A computational fluids dynamics scheme is presented to solve the unsteady Thin-Layer Navier-Stokes (TLNS) equations over a blunt body at high altitude, high Mach number atmospheric reentry flow conditions. This continuum approach is directed to low density hypersonic flows by accounting for non-zero bulk viscosity effects in near frozen flow conditions. The TLNS equations are solved over an axisymmetric body at zero incidence relative to the free stream. The time dependent axisymmetric governing equations are transformed into a computational plane, then cast into weak conservative form and solved using a first-order fully implicit scheme in time with second-order flux vector splitting for spatial derivatives. The physical domain is defined over representative sphere and sphere/cone geometries using a body-fitted clustered algebraic grid within a fixed domain (i.e., shock capturing). At the present time, nonequilibrium thermo-chemistry effects are not modeled. Catalytic wall, ionization and radiation effects are also excluded from the current analysis. However, the significant difference from previous studies is the inclusion of the capability to model non-zero bulk viscosity effects. The importance of bulk viscosity is reviewed and blunt body flow field solutions are presented to illustrate the potential contribution of this phenomena at high altitude hypersonic conditions. The current technique is compared with experimental data and other approximate continuum solutions. A variety of test cases are also presented for a wide range of free stream Mach conditions. 18 refs., 42 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6514470
• Report Number(s): SAND-90-1587C; CONF-910117-2; ON: DE90012756
• Resource Relation: Conference: 29. AIAA aerospace sciences conference, Reno, NV (USA), 7-10 Jan 1991
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HYPERSONIC FLOW
FLOW MODELS
DIFFERENTIAL EQUATIONS
EARTH ATMOSPHERE
FLUID MECHANICS
NAVIER-STOKES EQUATIONS
REENTRY VEHICLES
TRAJECTORIES
EQUATIONS
FLUID FLOW
MATHEMATICAL MODELS
MECHANICS
PARTIAL DIFFERENTIAL EQUATIONS
SPACE VEHICLES
VEHICLES
640410* - Fluid Physics- General Fluid Dynamics
990200 - Mathematics & Computers