Experimental and numerical investigation of the energy harvesting flexible flag in the wake of a bluff body

Date

2018-05-01

Author

Latif, Usman
Abdullah, Chaudary
Uddin, Emad
Younis, M. Yamin
Sajid, Muhamad
Shah, Samiur Rehman
Mubasha, Aamir

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

94
views

0
downloads

Inspired by the energy harvesting eel, a flexible flag behind a D-shape cylinder in a uniform viscous flow was simulated by using the immersed boundary method (IBM) along with low-speed wind tunnel experimentation. The flag in the wake of the cylinder was strongly influenced by the vortices shed from the upstream cylinder under the vortex-vortex and vortex-body interactions. Geometric and flow parameters were optimized for the flexible flag subjected to passive flapping. The influence of length and bending coefficient of the flexible flag the diameters (D) of the cylinder and the streamwise spacing between the cylinder and the flag, on the energy generation was examined. Constructive and destructive vortex interaction modes, unidirectional and bidirectional bending and the different flapping frequency were found which explained the variations in the energy of the downstream flag. Voltage output and flapping behavior of the flag were also observed experimentally to find a more direct relationship between the bending of the flag and its power generation.

Subject Keywords

Immersed boundary method, Fluid-structure interaction, Energy harvesting eel, Piezoelectric flag

URI

https://hdl.handle.net/11511/68412

Journal

WIND AND STRUCTURES

DOI

https://doi.org/10.12989/was.2018.26.5.279

Collections

Engineering, Article

Suggestions

OpenMETU
Core

Experimental and Computational Investigation of Vortex Formation in a Vertical Intake Structure Aydın, İsmail; Köken, Mete (2013-09-13) Vortex formation in the head pond of a hydroelectric power plant has been studied experimentally in a scaled hydraulic model. Velocity vector field and the turbulent kinetic energy distributions were measured using an Acoustic Doppler Velocimetry (ADV). Free surface flow in the head pond was also simulated using Flow-3D software. Comparison of measured and computed flow variables were satisfactorily good, promising the use of CFD tool to identify surface vortex and calculate its strength from the numerical ...
Numerical Simulation of a Flapping Micro Aerial Vehicle Through Wing Deformation Capture Tay, W. B.; de Baar, J. H. S.; Perçin, Mustafa; Deng, S.; van Oudheusden, B. W. (American Institute of Aeronautics and Astronautics (AIAA), 2018-8) Three-dimensional numerical simulations of a four-wing flapping micro aerial vehicle (FMAV) with actual experimentally captured wing membrane kinematics have been performed using an immersed boundary method Navier-Stokes finite volume solver. To successfully simulate the clap and fling motion involving the wing intersection, the numerical solver has been specifically modified to use a newly improved interpolation template searching algorithm to prevent divergence. Reasonable agreement was found between the ...
Experimental study of wave characteristics on a thin layer of de/anti-icing fluid Özgen, Serkan; Sarma, GSR (2002-10-01) Several series of experiments were conducted in order to investigate wave formation and wave characteristics on a thin layer of de/anti-icing fluid using a nonintrusive technique. The configuration consists of a thin layer of de/anti-icing fluid deposited on the lower wall of the wind tunnel section, sheared by a turbulent airflow. Beyond a critical value of the wind speed, two-dimensional surface waves could be observed. The characteristics of these waves like the wavelength and the wave speed could be mea...
Experimental and numerical investigation of a counter-rotating boundary layer ingesting propulsion system Bilyaz, İbrahim Soner; Başkan Perçin, Özge; Department of Aerospace Engineering (2023-1-23) This study investigates the performance of a boundary layer ingesting (BLI) propulsion system with a counter-rotating propulsor numerically and experimentally. The main benefit driver for a BLI propulsion system is that the propulsor ingests the boundary layer of the aircraft's fuselage, which is slower than the free stream velocity and consumes less power to generate the required thrust. The power-saving coefficient (PSC), the amount of power saved to obtain the same net streamwise force compared to the tr...
Design and analysis of a vertical axis water turbine for river applications using computational fluid dynamics Demircan, Eren; Aksel, Mehmet Haluk; Pınarcıoğlu, Mehmet Melih; Department of Mechanical Engineering (2014) The main purpose of this study is to design a Darrieus rotor type vertical axis water turbine using Computational Fluid Dynamics (CFD) in order to be used in river currents. The CFD modeling is based on two dimensional numerical solution of the rotor motion using commercial Unsteady Reynolds Averaged Navier-Stokes solvers, Ansys Fluent and CFX. To validate the two dimensional numerical solution, an experimental Darrieus rotor type water turbine from literature is studied and performance of several turbulenc...

Citation Formats

U. Latif et al., “Experimental and numerical investigation of the energy harvesting flexible flag in the wake of a bluff body,” WIND AND STRUCTURES, pp. 279–292, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68412.