Powering Analysis of Oscillating Foil Moving in Propagating Wave Flow Field

• Main Author: Yoon-Rak Choi
• Format: Article
• Language: English
• Published: The Korean Society of Ocean Engineers 2019-06-01
• Series: 한국해양공학회지
• Subjects: Time-mean power; Wave flow field; Oscillating foil; Perturbation theory; Quadratic transfer function
• Online Access: http://joet.org/upload/pdf/joet-33-3-229.pdf

In this study, a two-dimensional oscillating foil with forward speed in a propagating wave flow field was considered. The time-mean power to maintain the heaving and pitching motions of the foil was analyzed using the perturbation theory in an ideal fluid. The power, which was a non-linear quantity of the second-order, was expressed in terms of the quadratic transfer functions related to the mutual product of the heaving and pitching motions and incoming vertical flow. The effects of the pivot point and phase difference among the disturbances were studied. The negative power, which indicates energy extraction from the fluid, is shown as an example calculation.