Impact of a free-falling wedge with water: synchronized visualization, pressure and acceleration measurements

Lewis, Simon G., Hudson, Dominic A., Turnock, Stephen R. and Taunton, Dominic J. (2010) Impact of a free-falling wedge with water: synchronized visualization, pressure and acceleration measurements. Fluid Dynamics Research, 42, (3), 035509-[30pp]. (doi:10.1088/0169-5983/42/3/035509).


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A fixed 25deg deadrise angle wedge is allowed to fall from a range of heights into static water. A high-speed (up to 5000 frames s?1) camera is used to visualize the impact and subsequent formation of jet flows and droplets. Unsteady
pressure measurements at six locations across the wedge surface are measured at 10 kHz. Two accelerometers (10g, 100g) are mounted above the apex of the wedge and measure the vertical acceleration. A purpose-built position gauge and analysis of the synchronized video allows the wedge motion to
be captured. The synchronization of these data with the digital images of the impact makes it particularly suitable for the validation of computational fluid dynamics simulations as well as theoretical studies. A detailed experimental uncertainty analysis is presented. The repeatability of the test process is
demonstrated and the measured pressures are comparable to previous studies. A 2.5 ms time delay is identified between the point of impact observed from the video and the onset of actual wedge deceleration. The clear definition of the free surface provides insight into jet formation, its evolution and eventual
breakdown, further assisting with the development of numerical predictions

Item Type: Article
Digital Object Identifier (DOI): doi:10.1088/0169-5983/42/3/035509
ISSNs: 0169-5983 (print)
Keywords: wedge impact, validation, free surface, high speed video, slamming
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences > Fluid-Structure Interactions
ePrint ID: 79820
Accepted Date and Publication Date:
June 2010Published
Date Deposited: 22 Mar 2010
Last Modified: 31 Mar 2016 13:16

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