Accession Number : ADA241298

Title :   Effects of Waves on the Wake of a Surface-Piercing Flat Plate: Experiment and Theory

Descriptive Note : Technical rept.,

Corporate Author : IOWA INST OF HYDRAULIC RESEARCH IOWA CITY

Personal Author(s) : Stern, F. ; Choi, J. E. ; Hwang, W. S.

PDF Url : ADA241298

Report Date : AUG 1991

Pagination or Media Count : 114

Abstract : Results are presented from a towing-tank experiment conducted in order to document the effects of waves on the wake of a surface piercing body. A unique, simple model geometry is utilized which makes it possible to isolate and identify the most important features of the wave induced effects. Measurements were made for three wave-steepness conditions: zero, medium, and large. The effects of the waves for the latter two conditions are shown to be significant. In particular, the variations of the external flow pressure gradients cause acceleration and deceleration phases of the streamwise velocity component and alternating direction of the crossflow, which results in large oscillations of the displacement thickness and wake centerplane velocities as compared to the zero steepness condition. Remarkably, the wake displays a greater response, i.e. , a bias with regard to favorable as compared to adverse pressure gradients. The measurements are compared and close agreement is demonstrated with results from Reynolds-averaged Navier-Stokes calculations. Additional calculations are presented, including laminar flow results, which aid in explicating the characteristics of the near and intermediate wake, the periodic nature of the far wake, and wave-induced separation. Previously, experimental and computational results were presented for the boundary layer region.

Descriptors :   *ACCELERATION, DOWNSTREAM FLOW, THICKNESS, COMPUTATIONS, DISPLACEMENT, BOUNDARY LAYER, REGIONS, DISPLAY SYSTEMS, PHASE, SURFACES, PLATES, DOCUMENTS, WAKE, GEOMETRY, SEPARATION, EXTERNAL, FLOW, NAVIER STOKES EQUATIONS, OSCILLATION, LAMINAR FLOW, NEAR FIELD, REYNOLDS NUMBER, WAVES, DECELERATION, VELOCITY, PRESSURE GRADIENTS

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE