Abstract
A numerical investigation on the propulsion performance of the semi-active flapping foil of the wave glider with different mass ratio and damping coefficient is investigated. The commercial CFD software Fluent is used to solve the URANS equations around the flapping foil by the Finite Volume Method. A mesh of 2D NACA0012 foil with the Reynolds number Re = 42,000 is used in all simulations. We first analyze the effect of the mass ratio on the mean output power coefficient and propulsion efficiency and note that with the variation of the mass ratio, the propulsion efficiency decreases slightly. Besides, we find that the mass ratio has a noticeable influence on the mean output power coefficient, and the influence is determined by the reduced frequency. For high reduced frequency, with the increase of the mass ratio, the propulsion performance of the flapping foil decreases monotonously. For low reduced frequency, the mean output power increases slightly. For critically reduced frequency, the mean output power coefficient of the foil firstly increases and then decreases via the mass ratio increase. Then, we examine the influence of the damping coefficient on the propulsion performance of the flapping foil and find that the damping coefficient has a severe adverse effect on the output power and propulsion efficiency. We conclude that the influence of the damping coefficient should be considered first when we design the propulsion device of the semi-active flapping foil. Meanwhile, we should also consider the sea conditions to choose the mass ratio to optimize the flapping foil.
Highlights
The main advantages of the wave glider over traditional unmanned surface vehicle are long endurance and low maintenance
The effects ofsemi-active the reduced frequency, mass ratio and the damping onratio the performance of the flapping foil arethe simulated
The rangecoefficient of the mass propulsion performance of the semi-active flapping foil are simulated
Summary
The main advantages of the wave glider over traditional unmanned surface vehicle are long endurance and low maintenance. Research on the hydrodynamic characteristics of flapping foil of wave glider under wave conditions is necessary, which is of significance to the optimal design. Eng. 2019, 7, x FOR PEER REVIEW characteristics of flapping foil of wave glider under wave conditions is necessary, which is of. Researchers have applied different methods to establish establish two-body coupling dynamic model of a Kraus wave glider. The motion simulation that the sea conditions is one of sea conditions is one of the important factors affecting the velocity of the wave glider. Flapping foil of numerical simulations and experimental studies on theexperimental flapping foilstudies of the wave. Points out that stiffness is a key affecting theishydrodynamic of hydrodynamic characteristic of the flapping foil. There isofaplatform lack of research onHowever, the propulsion research on the propulsion mechanism of the flapping foil under wave conditions. Many scholars experimental methodsand andnumerical numerical simulation simulation methods propulsion mechanism mechanismof ofthe thesemi-active semi-activeflapping flappingfoil
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