Accession Number : ADA326267

Title :   Body Forces for an FF1052 Propeller.

Descriptive Note : Rept. for Oct 95-Sep 96,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECT ORATE

Personal Author(s) : Tseng, Caroll L. ; Nguyen, Phuc ; Fuhs, Donald

PDF Url : ADA326267

Report Date : MAY 1997

Pagination or Media Count : 21

Abstract : This project is the beginning of an effort to develop a general method for computing the effect of the propeller on the flow around the stern of surface ships, by treating the propeller as a body force when using a Reynolds Averaged Navier Stokes (RANS) code to compute the hull flow. The body force is a time average value that varies in the circumferential and radial directions across the propeller disk. An algorithm is shown for iterating between the propeller force calculation and the RANS wake calculation. The propeller force is computed using an unsteady lifting surface code and a RANS calculated nominal wake. The test case is the FF1052 Fleet propeller. Calculations were compared to measurements for both open water and behind hull using the RANS calculated wake. The sensitivity of the calculated forces to grid size and other input parameters was determined. The variation in unsteady loading on the blades is shown.

Descriptors :   *WAKE, *HYDRODYNAMIC CODES, *MARINE PROPELLERS, *SHIP HULLS, ALGORITHMS, LOAD DISTRIBUTION, HYDRODYNAMIC CHARACTERISTICS, OCEAN SURFACE, FLOW FIELDS, SHEAR STRESSES, NAVIER STOKES EQUATIONS, HYDRODYNAMICS, REYNOLDS NUMBER, AXIAL LOADS, PROPELLER BLADES, SHIP STERNS.

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE