Accession Number : ADP001951

Title :   Effect of Roughness on Three-Dimensional Turbulent Boundary Layer,

Corporate Author : SELSKAPET FOR INDUSTRIELL OG TEKNISK FORSKNING VED NORGES TEKNISKE HOEGSKOLE TRONDHEIM

Personal Author(s) : Krogstad,P. A. ; Fannelop,T. K.

Report Date : 1982

Pagination or Media Count : 8

Abstract : The paper describes a three-dimensional boundary-layer experiment on a rough surface. The data obtained are compared to a reference experiment having the same geometry and flow conditions but with a smooth surface. The boundary layer date are compared using scaling criteria developed from two-dimensional flows. It is found that the results, in terms of scaled variables, agree well in regions where pressure gradients are the dominant cause of three-dimensionality. In regions where shear stresses are more important, significant deviations in profile characteristics appear. A possible interpretation is that the degree of anisotropy is greater in three-dimensional rough boundary-layer flows than in the corresponding smooth-wall case. (Author)

Descriptors :   *Turbulent boundary layer, Three dimensional, Surface roughness, Two dimensional flow, Pressure gradients, Shear stresses, Boundary layer flow, Skin friction, Walls

Distribution Statement : APPROVED FOR PUBLIC RELEASE