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THE TURBULENT BOUNDARY LAYER STRUCTURE OVER DIATOMACEOUS SLIME FOULING

Elizabeth A. K. Murphy
Department of Environmental Sciences University of Virginia Charlottesville, Virginia, 22903, USA

Julio M. Barros
Department of Mechanical Engineering, United States Naval Academy Annapolis, MD 21402 USA

Michael P. Schultz
Department of Naval Architecture and Ocean Engineering United States Naval Academy Annapolis, Maryland 21402 USA

Karen A. Flack
Department of Mechanical Engineering United States Naval Academy Annapolis, MD 21402 USA

Cecily N. Steppe
Department of Oceanography United States Naval Academy Annapolis, Maryland, 21402, USA

Matthew A. Reidenbach
Department of Environmental Sciences University of Virginia Charlottesville, Virginia, 22903 USA

Sinopsis

Biofilm fouling has a significant effect on ship performance. Here, the impact of biofilm fouling on boundary layer structure is investigated. Turbulent boundary layer measurements were performed over diatomaceous-slime-fouled plates using high resolution PIV. The mean velocity profile over biofilm shows the expected downward shift (ΔU+), producing higher drag, and hence higher friction velocity. This increase in drag is seen in enhanced turbulent kinetic energy and Reynolds shear stress. Due to the complex nature of the biofilm's topography, the flow is heterogeneous in the streamwise direction when compared with smooth-wall flows.