Accession Number : AD0410862

Title :   DIRECT-INTERACTION APPROXIMATION FOR A SYSTEM OF SEVERAL INTERACTING SIMPLE SHEAR WAVES,

Corporate Author : NEW YORK UNIV N Y COLL OF DENTISTRY

Personal Author(s) : Kraichnan,Robert H.

Report Date : JUN 1963

Pagination or Media Count : 24

Abstract : The direct-interaction approximation is applied to the evolution in time of systems of several interacting inviscid simple shear waves whose initial amplitudes have a Gaussian statistical distribution. The results are compared numerically with exact statistical solutions obtained by numerical integration of the equations of motion of the wave amplitudes for a large set of initial conditions. It is found that the direct-interaction results can provide an adequate approximation in cases where both perturbation theory and the quasinormality approximation give physically unacceptable results. (Author)

Descriptors :   *MECHANICAL WAVES, *TURBULENCE, FUNCTIONS(MATHEMATICS), MATHEMATICAL MODELS, NUMERICAL ANALYSIS, PERTURBATION THEORY, SHEAR STRESSES, STATISTICAL DISTRIBUTIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE