Finite amplitude torsional oscillations of shape-morphing plates immersed in viscous fluids

2020 ◽  
Vol 32 (5) ◽  
pp. 053101
Author(s):  
Syed N. Ahsan ◽  
Matteo Aureli
Keyword(s):  
Finite Amplitude ◽  
Viscous Fluids ◽  
Torsional Oscillations ◽  
Shape Morphing

Torsional Oscillations of a Shape-Morphing Plate in Viscous Fluids

2019 ◽  
Author(s):  
Syed N. Ahsan ◽  
Matteo Aureli
Keyword(s):  
Power Dissipation ◽  
Stokes Equations ◽  
Oscillation Amplitude ◽  
Finite Amplitude ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Torsional Oscillations ◽  
Shape Morphing ◽  
Moment Control ◽  
Interaction Problem

Abstract In this paper, we investigate finite amplitude torsional oscillations of a shape-morphing plate submerged in a quiescent, Newtonian, incompressible fluid. To address this problem, we focus on a two-dimensional cross section of the plate and para-metrically study hydrodynamic moments and power dissipation during the plate oscillation as a function of the shape-morphing deformation intensity and the oscillation amplitude. This fluid-structure interaction problem is tackled within the framework of a computational fluid dynamics model where the fluid flow is described via the Navier-Stokes equations and the deformations of the structure are prescribed. The results demonstrate a gradual reduction of hydrodynamic moment and nonmonotonic power dissipation behavior as the imposed shape-morphing becomes more aggressive. In addition, power dissipation can be minimized for an optimum value of the shape-morphing intensity. Results from this study are relevant in underwater systems subjected to torsional oscillations and demonstrate an avenue for hydrodynamic moment control and reduction of energy losses.

Propagation of long waves of finite amplitude at the interface of two viscous fluids

1985 ◽  
Vol 11 (4) ◽  
pp. 481-502 ◽  
Author(s):  
G. Ooms ◽  
A. Segal ◽  
S.Y. Cheung ◽  
R.V.A. Oliemans
Keyword(s):  
Finite Amplitude ◽  
Viscous Fluids ◽  
Long Waves

scholarly journals Instability of the interface of two viscous fluids moving in a channel. Part II a. Nonlinear problem

1989 ◽  
Vol 11 (3) ◽  
pp. 52-59
Author(s):  
Tran Van Tran
Keyword(s):  
Steady State ◽  
Nonlinear Problem ◽  
Hydrodynamic Stability ◽  
Evolution Equations ◽  
Finite Amplitude ◽  
Viscous Fluids ◽  
Weakly Nonlinear ◽  
Concurrent Flow ◽  
Periodic Steady State

In this paper, the method of multiple scaling is used for obtaining the am-altitude evolution equations from the weakly nonlinear problem of hydrodynamic stability of concurrent flow of two viscous fluids in a channel It. is shown that in the case of stability the, interface may evolve to some finite amplitude with periodic steady state.

Nonlinear finite amplitude torsional vibrations of cantilevers in viscous fluids

2012 ◽  
Vol 111 (12) ◽  
pp. 124915 ◽  
Author(s):  
Matteo Aureli ◽  
Christopher Pagano ◽  
Maurizio Porfiri
Keyword(s):  
Finite Amplitude ◽  
Viscous Fluids ◽  
Torsional Vibrations

Nonlinear finite amplitude vibrations of sharp-edged beams in viscous fluids

2012 ◽  
Vol 331 (7) ◽  
pp. 1624-1654 ◽  
Author(s):  
M. Aureli ◽  
M.E. Basaran ◽  
M. Porfiri
Keyword(s):  
Finite Amplitude ◽  
Viscous Fluids

Hydrodynamic Loads on Vibrating Cantilevers Under a Free Surface in Viscous Fluids With SPH

2013 ◽  
Author(s):  
Angelantonio Tafuni ◽  
Iskender Sahin
Keyword(s):  
Free Surface ◽  
Hydrodynamic Force ◽  
Finite Amplitude ◽  
Viscous Fluids ◽  
Periodic Force ◽  
Thin Beam ◽  
Fluid Field ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Phase Lags

Smoothed Particle Hydrodynamics (SPH) based simulations are implemented to study finite amplitude vibrations of a submerged cantilever beam in viscous fluids under a free surface. The cross section of a thin beam is modelled as a rectangular 2D oscillating rigid lamina, around which fluid field properties are computed. The study is carried out using non-dimensional frequency, amplitude of oscillations and depth of submergence. The total hydrodynamic force on the vibrating beam is extracted via SPH analysis, together with the contours of fluid field properties. Comparison is made between the results obtained with and without the free surface. We find that the presence of the free surface strongly influences the flow physics around the lamina, giving rise to non-harmonic velocity profiles and non-periodic force responses, coupled with phase lags and non-zero mean force during periodic oscillations.

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