The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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HYDRODYNAMIC PERFORMANCE OF AN ARRAY OF OSCILLATING WATER COLUMN DEVICE EXPOSED TO OBLIQUE WAVES


Go-down ichd2016 Tracking Number 74

Presentation:
Session: Hydrodynamics in Ocean III
Room: Room 3
Session start: 10:30 Tue 20 Sep 2016

John Ashlin Samuel   johnashlins@gmail.com
Affifliation: Research scholar, Student.

Sannasiraj Sannasi Annamalaisamy   sasraj@iitm.ac.in
Affifliation: Professor

Sundar Vallam   vsundar@iitm.ac.in
Affifliation: Professor


Topics: - Hydrodynamics in ocean, coastal and estuary engineering

Abstract:

A detailed three-dimensional experimental investigation on the performance evaluation of an array of oscillating water column (OWC) integrated with offshore detached breakwater (ODBW) subjected to oblique wave incidence is studied. A Froude scale of 1:20 was chosen for integrating five similar devices of OWC to the ODBW (OWCBW) and a series of experiments was carried out in a shallow wave basin for angle of wave approaching between 900 and 700 with reference to the front face of the structure with an angular decrement of 100. The hydrodynamic performance was studied in terms of lip wall pressure ratio, wave amplification factor, air pressure ratio, capture width and relative capture width. The constructive interference due to three dimensional effects concentrates higher amount of energy in front of the array of OWCs for normal wave incidence. It makes system to absorb larger amount of wave power of about 2.3 times the given input power at natural frequency of the system. This confirms that the array of OWC devices exhibits better performance than in isolation. The performance of the system reduces with angular decrement due to peak of the wave front reaches the line front of OWCBW at different time along with wave dissipation over the breakwater. The natural frequency of the system was around d/L of 0.128 and unaltered for different angle of wave incidence.