Location:
Alrick Building, Classroom 10
Date:
Friday, July 15, 2016 - 13:00 to 14:00
1st Presenters: New Starts
Affiliation: Institute for Energy Systems, University of Edinburgh
Title: To Be Confirmed
2nd Presenter: David Crooks
Affiliation: Institute for Energy Systems, University of Edinburgh
Title: Exciting Waves - Oscillating Wave Surge Converter Forced Oscillation Tests
Abstract:
Forced Oscillation Tests (FOTs) involve forcing a body to oscillate in still water. Measurements of the body?s motion, and the force required to cause that motion, enable the calculation of hydrodynamic force coefficients, such as added mass and radiation damping. Hydrodynamic force coefficients are required in Wave Energy Converter (WEC) frequency and time domain numerical models as they represent the magnitude and phase of the force experienced by the WEC as the surrounding fluid resists its motion.
This talk presents a series of FOTs carried out on a surface piercing and bottom hinged Oscillating Wave Surge Converter (OWSC).
The hydrodynamic torque results obtained during the FOTs will be presented and compared with estimates made by two linear BEM codes; the industry standard WAMIT and the recently released open-source code Nemoh. The experimental results show the BEM codes to estimate hydrodynamic torque well when the OWSC is forced to oscillate with small amplitudes of motion as expected. However, agreement between the two approaches is shown to decrease with both an increase in angular displacement and angular velocity, thus identifying the limitations of applicable use of BEM codes for such a device type. The characteristics of the torque not estimated by the BEM codes will also be presented.
Bio:
David graduated from the University of Edinburgh with an MEng degree in Mechanical Engineering with Renewable Energy. After working for a period of time in hydro power he took up a PhD position within Queen?s University Belfast?s Marine Research Group. His PhD research is focused on developing the understanding of Oscillating Wave Surge Converter hydrodynamics through the physical testing of equation of motion terms. David returned to IES in March 2016 to join the Policy and Innovation Group. During the day David works on the techno-economic analysis of wave energy converters, during the evening you will find him stuck at a desk finishing his PhD thesis.
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