Study on the Efficiency of a Wave Energy Converter Using Anti-rolling Tank
Date Issued
2012
Date
2012
Author(s)
Tsou, Yuan-Yang
Abstract
A floating body subjected to wave forces will perform motion in six degrees of freedom, i.e. surge, sway, heave, roll, pitch and yaw. The roll motion is the most critical one because it is lightly damped and therefore prone to dynamic magnification. Excessive motions interfere with the comfort of passengers and in some situations this may cause internal damage to the contents of the containers. Dates back to 1874, Froude installed water chambers in upper part of a ship for the first time to achieving stabilization against roll.
Anti-rolling tanks contain water that follows the ship’s rolling and acquires a phase lag with respect to the ship movement, the moment generated partially counteracts the sea wave moment. Following the study in 2011 [1], we focus on internal water flow kinetic energy generation and the efficiency of energy conversion from a tank rolled by active excitation and rolled in passive way by water wave .
In this study, we applied ANSYS FLUENT, a commercial CFD software package, to analyze a two dimensional anti-rolling tank, verified floating body motions in wave conditions, calculated added mass and damping coefficient, and compared these results with those published in the references [2][3]. And then we verified the calculated moment and phase difference due to internal water flow of anti-rolling tank under harmonic roll motions by comparing with the results published in the reference [4]. Finally, we used SDOF UDF to simulate the internal water flow of two kinds of anti-rolling tank excited by waves of various conditions, and investigated the efficiency of energy conversion of these anti-rolling tanks.
Subjects
Wave Energy Converter
Rolling tank
CFD
SDOF
Type
thesis
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