Accession Number : ADA300266

Title :   Development and Evolution of Nearshore Topography.

Descriptive Note : Final technical rept. 1 Jun 93-31 May 95,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA

Personal Author(s) : Werner, Bradley T.

PDF Url : ADA300266

Report Date : 17 OCT 1995

Pagination or Media Count : 4

Abstract : Hydrodynamic descriptions of one-dimensional granular systems have emphasized that the usual master variables, density, velocity and temperature are inadequate. A minimal description requires a fourth variable which is the third moment or "skewness" of the single particle velocity distribution function. These supplemented hydrodynamic systems have been used to study the linear stability of the spatially homogeneous state and good agreement with numerical simulation has been claimed. The linear stability analysis also shows that the hydrodynamic equations are ill-posed because the instability has no high wavenumber cut-off. That is, arbitrarily small scale disturbances are linearly unstable. This problem with the hydrodynamic description is physically justified because inelastic collapse is a particle scale mechanism through which hydrodynamics fails.

Descriptors :   *HYDRODYNAMICS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, LINEAR SYSTEMS, STABILITY, INSHORE AREAS, COMPUTATIONAL FLUID DYNAMICS, TOPOGRAPHY, DISTRIBUTION FUNCTIONS, GRANULAR MATERIALS, PARTICLE COLLISIONS, ONE DIMENSIONAL FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE