Journal ArticleDOI
Interplay of chordwise stiffness and shape on performance of self-propelled flexible flapping plate
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In this paper, the locomotion of a flapping flexible plate with different shapes and non-uniform chordwise stiffness distribution in a stationary fluid is studied numerically, and the normalized effective bending stiffness for three-dimensional plates with arbitrary stiffness distribution and shape parameters is proposed.Abstract:
The locomotion of a flapping flexible plate with different shapes and non-uniform chordwise stiffness distribution in a stationary fluid is studied numerically. The normalized effective bending stiffness K∗ for three-dimensional plates with arbitrary stiffness distribution and shape parameters is proposed, and the overall bending stiffness of non-uniform plates with different shapes is reasonably characterized. It is found that the propulsion performance in terms of cruising speed and efficiency of the self-propelled flapping plate mainly depends on the effective bending stiffness. Plates with moderate flexibility K∗ show better propulsion performance. Meanwhile, both a large area moment of the plate and a flexible anterior are favorable to significantly improve their propulsive performance. The evolution of vortical structures and the pressure distribution on the upper and lower surfaces of the plate are analyzed, and the inherent mechanism is revealed. These findings are of great significance to the optimal design of propulsion systems with different fins or wings.read more
Citations
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Journal ArticleDOI
Fluid-structure interaction of bio-inspired flexible slender structures: a review of selected topics
TL;DR: This survey of recent studies on highly simplified bio-inspired models that aim to reveal the flow physics associated with FSI plays a key role in the dynamics of such structures immersed in fluids.
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Influences of serrated trailing edge on the aerodynamic and aeroacoustic performance of a flapping wing during hovering flight
TL;DR: In this article , the influence of serrated trailing edge on the aerodynamic and aero-acoustic performance of a flapping wing during hovering flight was investigated using a hybrid framework of an immersed boundary Navier-Stokes solver for the flow field and the Ffowcs Williams-Hawkings (FW-H) analogy for the sound field.
Journal ArticleDOI
Harmonic forcing of a laminar bluff body wake with rear pitching flaps
TL;DR: In this paper , a numerical study on the response of a two-dimensional bluff body wake subjected to harmonic forcing imposed by two rear pitching flaps is performed, where the wake is generated by a rectangle at a height-based Reynolds number $Re=100$, characterised by laminar vortex shedding.
Journal ArticleDOI
How Non-Uniform Stiffness Affects the Propulsion Performance of a Biomimetic Robotic Fish
TL;DR: In this article , a customized experimental platform is built, which eases the adjustment of the non-uniform stiffness ratio, the stiffness of the flexible part, the flapping frequency, and flapping amplitude.
Journal ArticleDOI
Propulsion of a combined heaving and trailing-edge morphing foil for bio-inspired applications
Ishan Neogi,Vaibhav Joshi +1 more
TL;DR: In this paper , the effects of the morph position and amplitude on the flow dynamics and propulsion of a morphing-heaving foil are investigated, and it is found that the foil is highly efficient in generating propulsive forces at high morph amplitudes and low morph positions.
References
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Journal ArticleDOI
Maximizing propulsive thrust of a driven filament at low Reynolds number via variable flexibility.
TL;DR: In this article, the authors consider the propulsive thrust generated by a clamped filament periodically driven at one end, and show that the optimal flexibility distribution is strongly configuration-dependent.
Journal ArticleDOI
On the propulsive performance of pitching flexible plates with varying flexibility and trailing edge shapes
TL;DR: In this paper, the authors examined the impact of the frequency ratio f* defined as the ratio of the natural frequency of the flexible plate to the actuated pitching frequency and found that the optimal propulsive efficiency is achieved around f*=1.54 instead of the resonance condition.
Journal ArticleDOI
Dynamic performance and wake structure of flapping plates with different shapes
Gaojin Li,Nansheng Liu,Xi-Yun Lu +2 more
TL;DR: In this paper, the dynamic performance and wake structure of flapping plates with different shapes were studied using multi-block lattice Boltzman and immersed boundary method, and two typical regimes relevant to thrust behavior were identified.
Journal ArticleDOI
Numerical simulations of an inverted flexible plate in linear shear flows
Journal ArticleDOI
Effects of tunable stiffness on the hydrodynamics and flow features of a passive pitching panel
TL;DR: In this paper, the effects of phase difference between the stiffness profile and the oscillation motion and as well as the effect of stiffness fluctuation amplitude (G k ) are investigated.
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