Accession Number : ADA184751

Title :   A Study of Chaos and Mixing in Rayleigh-Taylor and Richtmyer-Meshkov Unstable Interfaces.

Descriptive Note : Technical rept.,

Corporate Author : NEW YORK UNIV NY COURANT INST OF MATHEMATICAL SCIENCES

Personal Author(s) : Gardner,C L ; Glimm,J ; Grove,J ; McBryan,O ; Menikoff,R

PDF Url : ADA184751

Report Date : Apr 1987

Pagination or Media Count : 17

Abstract : Instabilities of fluid interfaces give rise to entrainment and to a chaotic mixing layer. This report has three purposes. The authors discuss the general features of such chaotic mixing layers, formulate a scientific program for their study and report on their recent progress in carrying out portions of this program. The Rayleigh-Taylor instability is driven by an inertial or gravitational force accelerating an interface between fluids of differing densities. Thus with the heavy fluid above the lighter fluid a flat (horizontal) interface in a gravitational field is in a position of unstable equilibrium. Small disturbances grow, producing bubbles of light fluid rising in the heavy fluid and spikes - or droplets of heavy fluid falling in the light fluid. The Richtmyer-Meshkov instability is produced by a shock wave hiring an interface (a contact discontinuity or material boundary) separating fluids of differing densities. Assuming a planar shock wave normally incident on an interface slightly perturbed from planar, the initial disturbances in the interface are again unstable, and grow with time.

Descriptors :   *FLUID DYNAMICS, *INTERFACES, MATHEMATICAL MODELS, MIXING, ENTRAINMENT, LAYERS, GRAVITATIONAL FIELDS, SHOCK WAVES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE