
Accession Number : ADA119818
Title : A New Generalized CrossFlow Momentum Integral Method for ThreeDimensional Ship Boundary Layers.
Descriptive Note : Final rept. 3 Feb 8130 Jun 82,
Corporate Author : SCIENCE APPLICATIONS INC ANNAPOLIS MD
Personal Author(s) : VON Kerczek,C H
PDF Url : ADA119818
Report Date : 02 Apr 1982
Pagination or Media Count : 38
Abstract : A new crossflow model for a threedimensional momentum integral turbulent boundary layer calculation method has been developed. This crossflow model utilizes two parameters and is capable of representing the reversal (sshaped) crossflow profiles that do occur in ship boundary layers. The new method uses only an extra algebraic equation for determining the extra crossflow parameter. The basic momentum integral equations used by the method are the streamwise and crossflow momentum equations and the entrainment equation. The method has been programmed for calculating ship boundary layers. Certain higher order geometric effects have been included. Test calculations for the experimental boundary layer data of the SSPAModel 720 have been made. The results are very promising. Good agreement with experimental data is obtained over that portion of the hull where viscousinviscid interactions do not occur. Near the stern the predictions are qualitatively correct. The sshaped, crossflow profiles are predicted near the stern but they are somewhat inaccurate. The addition of viscousinviscid interaction capabilities to the calculation should greatly improve the predictions of the boundary layer near the stern. (Author)
Descriptors : *Turbulent boundary layer, *Three dimensional flow, Cross flow, Mathematical models, Integral equations, Drag, Viscous flow, Ships, Numerical methods and procedures
Subject Categories : Numerical Mathematics
Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE