Abstract
This paper presents a parametric study on a forced pitching hydrofoil. The non-dimensional frequency (Strouhal number, Std) and amplitude ratio (A∗) of the hydrofoil pitching are varied as 0.21 ≤Std≤ 0.33 and 0.55 ≤A∗≤ 0.8, respectively. The numerical solution of the problem is obtained using unsteady Navier–Stokes equations. Coefficients of thrust, power, and efficiency of the hydrofoil are calculated and presented on the Std – A∗ plane. The evolution of the flow structure around the pitching hydrofoil is clarified for the conditions corresponding to both drag and thrust generations. A flow model is hypothesized. A mathematical analysis of the flow model, involving Euler, Coriolis and centrifugal accelerations in a non-inertial frame, is developed to assimilate the physical insight into the thrust generation and power input. The analysis provides theoretical relationships of thrust, power, and efficiency as functions of Strouhal number and/or amplitude ratio. The data from the numerical simulation tangibly support the relationships. This subject would be handy for undergraduate and postgraduate studies.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
