K
Karen A. Flack
Researcher at United States Naval Academy
Publications - 73
Citations - 4546
Karen A. Flack is an academic researcher from United States Naval Academy. The author has contributed to research in topics: Boundary layer & Turbulence. The author has an hindex of 33, co-authored 71 publications receiving 3834 citations.
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Review of Hydraulic Roughness Scales in the Fully Rough Regime
TL;DR: A review of predictive methods used to determine the frictional drag on a rough surface is presented in this paper, where a new correlation is proposed to estimate the drag for a surface covered with three-dimensional, irregular roughness in the fully rough regime.
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The rough-wall turbulent boundary layer from the hydraulically smooth to the fully rough regime
TL;DR: In this paper, the root-mean-square roughness height was at least three orders of magnitude smaller than the boundary-layer thickness, and the Karman number was as high as 10100.
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Experimental support for Townsend’s Reynolds number similarity hypothesis on rough walls
TL;DR: In this paper, the boundary layers on the rough walls were in the fully rough flow regime (k+⩾100) with the ratio of the boundary layer thickness to the equivalent sand roughness height greater than 40.
Journal Article
The rough-wall turbulent boundary layer from the hydraulically smooth to the fully rough regime
TL;DR: In this article, the rough wall boundary layers are compared to those for a smooth wall and the results lend strong support to the concept of outer layer similarity for rough walls in which there is a large separation between the roughness length scale and the largest turbulence scales.
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Examination of a critical roughness height for outer layer similarity
TL;DR: In this article, the existence of a critical roughness height for outer layer similarity between smooth and rough wall turbulent boundary layers is investigated and it is shown that the roughness sublayer is confined to a region <5k or 3k from the wall.