Numerical simulation of unstably stratified sheared flows
A numerical investigation has been performed of three-dimensional instabilities arising in unstably stratified sheared flows. The numerical code developed for the study is the REBUFFS3D (REcirculating BUoyant and Forced Flow Solver-3D) code. It is an extension of the earlier well-tested REBUFFS code developed in Berkeley and includes the improvements embodied in the later Stanford version of the code, REMIXCS (REcirculation MIXed Convection Simulator). Two flow configurations were investigated. In the first, the instabilities are induced by injecting a layer of low density fluid into a co-flowing heavier fluid; in the second, the instabilities are induced by the unstable stratification resulting from the collision of two opposing buoyancy-driven boundary layers moving along a vertical wall. As observed in the experiments for each problem, longitudinal vortices are induced by the buoyancy, the wavelength and stability of which depend on the shear imposed. In the first case, a shear-induced instability appears in addition to the buoyant, which also agrees with the experiment. 91 refs., 233 figs., 15 tabs.
- Research Organization:
- California Univ., Berkeley, CA (USA). Dept. of Mechanical Engineering
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG03-85ER13397
- OSTI ID:
- 5292694
- Report Number(s):
- DOE/ER/13397-1; ON: DE90005396
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FLUID FLOW
R CODES
VORTEX FLOW
LAYERS
BOUNDARY LAYERS
COMPUTERIZED SIMULATION
COUETTE FLOW
CROSS SECTIONS
HYDRODYNAMICS
INSTABILITY
ISOTHERMAL PROCESSES
MATHEMATICAL MODELS
PERTURBATION THEORY
PLANNING
RAYLEIGH-TAYLOR INSTABILITY
RECOMMENDATIONS
S CODES
SHEAR PROPERTIES
STABILITY
STRATIFICATION
TECHNOLOGY ASSESSMENT
WEIGHT
COMPUTER CODES
FLUID MECHANICS
MECHANICAL PROPERTIES
MECHANICS
SIMULATION
VISCOUS FLOW
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