Impact of a free-falling wedge with water: synchronized visualization, pressure and acceleration measurements
Impact of a free-falling wedge with water: synchronized visualization, pressure and acceleration measurements
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
wedge impact, validation, free surface, high speed video, slamming
035509-[30pp]
Lewis, Simon G.
d108874c-2f44-43a8-b3a2-694bc7d2d6c0
Hudson, Dominic A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Taunton, Dominic J.
10bfbe83-c4c2-49c6-94c0-2de8098c648c
June 2010
Lewis, Simon G.
d108874c-2f44-43a8-b3a2-694bc7d2d6c0
Hudson, Dominic A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Taunton, Dominic J.
10bfbe83-c4c2-49c6-94c0-2de8098c648c
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), .
(doi:10.1088/0169-5983/42/3/035509).
Abstract
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
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Published date: June 2010
Keywords:
wedge impact, validation, free surface, high speed video, slamming
Organisations:
Fluid Structure Interactions Group
Identifiers
Local EPrints ID: 79820
URI: http://eprints.soton.ac.uk/id/eprint/79820
ISSN: 0169-5983
PURE UUID: a615e8fd-4628-4704-bb77-86a516ba54f4
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Date deposited: 22 Mar 2010
Last modified: 14 Mar 2024 02:42
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Author:
Simon G. Lewis
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