Accession Number : AD0720690

Title :   Faired Towline Hydrodynamics.

Descriptive Note : Technical publication Jan-Jul 69,

Corporate Author : NAVAL UNDERSEA RESEARCH AND DEVELOPMENT CENTER SAN DIEGO CALIF

Personal Author(s) : Calkins,D. E.

Report Date : FEB 1971

Pagination or Media Count : 61

Abstract : A theoretical analysis (termed boundary layer loading functions) for determining the hydrodynamic forces on a faired towline was developed. The analysis required that the hydrodynamic forces (loading functions) acting on an element of the towline be defined as functions of the towline's local inclination angle to the flow and the Reynolds number. The analysis was based on the consideration of the boundary layer formed on the airfoil-shaped cross section used for the towlines. The Reynolds Number effect on the loading functions was derived using momentum theory, and the pressure distribution around the airfoil section was defined. When potential flow theory was used, it gave excellent results when compared with the pressure distribution measurements made on models. The theoretical loading functions were compared with model data obtained from water channel, tow tank, and wind tunnel tests. The analytical results showed excellent correlation with the data.

Descriptors :   (*TOWING CABLES, HYDRODYNAMICS), (*CABLE FAIRINGS, HYDRODYNAMICS), TOWED SONAR, HYDRODYNAMIC CONFIGURATIONS, BOUNDARY LAYER TRANSITION, REYNOLDS NUMBER, MODEL TESTS, DRAG

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE