Vibration-based flow energy harvesting enables robust, in-situ extraction for low-power applications, such as distributed sensor networks. Fluid-structure instabilities dictate a harvester's viability since the structural response to determines its power output. Previous work on flextensional-based harvester demonstrated that an elastic member within converging-diverging channel is susceptible ...

In this paper, we study the fluid-structure interaction (FSI) of a three-dimensional (3D) flexible membrane immersed in an unsteady separated flow at moderate Reynolds numbers. We employ body-conforming variational FSI solver based on recently developed partitioned iterative scheme for coupling turbulent fluid with nonlinear structural dynamics. Of particular interest is to understand flow-exci...

In the present paper, turbulent flow in a composite porous–fluid system, including permeable surface-mounted bluff body immersed channel flow, is investigated using pore-scale large eddy simulation. The effect of Reynolds number (Re) on leakage from porous to non-porous regions, Kelvin–Helmholtz (K–H) instabilities, as well coherent structures over interface are elaborated by comparing cases wi...

This paper is concerned with the existence of local absolute instability in the boundary-layer flow over the outer surface of a rotating cone, thereby extending earlier work by Lingwood who considered the rotating disk. Both still outer fluids and non-zero axial flow are considered, viscous and streamline-curvature effects are included, and the analysis is conducted for a wide range of cone hal...

Abstract. The Benjamin-Feir instability describes the instability of a uniform oscillatory wave train in an irrotational flow subject to small perturbation of wave number, amplitude and frequency. Their instability analysis is based on the perturbation around the second order Stokes wave which satisfies the dynamic and kinematic free-surface boundary conditions up to the second order. In the sa...

We propose an efficient method for computing coupled flow–body dynamics. The time-stepping is implicit, and uses an iterative method (preconditioned GMRES) to solve the flow–body equations. The preconditioner solves a decoupled version of the equations which involves only the inversion of banded matrices, and requires a small number of iterations per time step. We use the method to probe the in...