Accession Number : AD0704984

Title :   TURBULENCE MEASUREMENTS IN STABLY STRATIFIED FLUIDS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Pao,Yih-Ho

Report Date : FEB 1970

Pagination or Media Count : 49

Abstract : A towing tank system was used to study the structure of turbulence in stably stratified fluids. Turbulence is generated by moving an obstacle (a grid or a cylinder) in a tank of stratified salt water. Recent improved shadowgraph pictures of these laboratory generated stratified flows are shown in the paper. They give further support to Pao's observation that (1) internal waves and turbulence coexist in turbulent stratified flows, with internal waves at the large scales and turbulence at the small scales; (2) turbulence decays much more rapidly than internal waves; and (3) the turbulent-nonturbulent interfaces are not necessarily sharp, and the transition region may consist of mostly internal waves. Diagnostic methods to distinguish internal waves from turbulence with two probe measurements are proposed. (Author)

Descriptors :   (*TURBULENCE, MEASUREMENT), OCEAN WAVES, ATMOSPHERIC MOTION, STABILITY, PROBES, WATER TUNNELS, SEA WATER

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE