Numerical Analysis of Hydrodynamics for Bionic Oscillating Hydrofoil Based on Panel Method

Xue, Gui-Rong; Liu, Yanjun; Zhang, Muqun; Ding, Hongpeng

doi:10.1155/2016/6909745

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…The physical prototype of the fish-like model was developed as the shape of tuna with the revolutionary technology of rapid prototyping manufacturing, as reported in previous research (Xue, Liu, Zhang, & Ding, 2016). We used force sensors and signal acquisition modules to measure and record the transient hydrodynamic force with a sampling frequency of 0.1 s. The physical prototype could swim in a two-dimensional plane of a small water tank with the help of guide rails fixed on the support structure and the base support.…”

Section: Experimental Modelmentioning

confidence: 99%

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

Xue

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Underwater vehicles are widely used in underwater detection, and bionic design, e.g. imitating fish, is an important way to improve their hydrodynamic performance. Most research is on the mechanical structure and kinematics of fish-like models, while evolvement rules and hydrodynamic effects of fluid field around fish have not been studied adequately. In this paper, a kinematic model to simulate the swimming motion of fish is established according to the actual movement of tuna, and the model is optimized to achieve convenient adjustment in the initial oscillating position and maximum oscillating amplitude. A numerical simulation model is established and the boundary condition is verified by experiments with a physical fish-like prototype and a set of force measuring devices. The evolvement rule of the fluid field around the fish-like model from starting to cruising is determined and the hydrodynamic effect is analyzed. The issue of the effect of fluid fields with various averaged fish-like model densities in the buoyancy regulating process is discussed. Finally, a novel way to calculate the Strouhal number is proposed. The results show that the averaged drag force coefficient decreases as the fish-like model speeds up, because the water pressure near the fish head strengthens to generate a larger resistance force and the vortex in the wake field disperses to produce a less positive effect. The viewpoint that the superposition of vortices will benefit the fish-like model instead of weakening the positive effect is confirmed. The width value of the reversed Kármán vortex street can be connected with the Strouhal number, and the Strouhal number can be calculated by the evolvement rule of the fluid field. This research will contribute to bionic autonomous underwater vehicle design. ARTICLE HISTORY

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Section: Experimental Modelmentioning

confidence: 99%

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

Xue

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…Feilich and Lauder [ 22 ] indicated that the shape and stiffness can affect the hydrodynamic performance of a tuna-like tail. Xue et al [ 23 ] carried out a numerical hydrodynamic analysis for a physical prototype imitating the shape of tuna based on the Panel method. Then, Xue et al [ 24 ] discussed the evolvement rule and hydrodynamic effect of fluid field around tuna-like model from starting to cruising.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analysis for the Morphing Median Fins of Tuna during Yaw Motions

Xiao-hu

2021

Applied Bionics and Biomechanics

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Tuna can change the area and shape of the median fins, including the first dorsal, second dorsal, and anal fins. The morphing median fins have the ability of adjusting the hydrodynamic forces, thereby affecting the yaw mobility of tuna to a certain extent. In this paper, the hydrodynamic analysis of the median fins under different morphing states is carried out by the numerical method, so as to clarify the influence of the erected median fins on the yaw maneuvers. By comparing the two morphing states of erected and depressed, it can be concluded that the erected median fins can increase their own hydrodynamic forces during the yaw movement. However, the second dorsal and anal fins have limited influence on the yaw maneuverability, and they tend to maintain the stability of tuna. The first dorsal fin has more lift increment in the erection state, which can obviously affect the hydrodynamic performance of tuna. Moreover, as the median fins are erected, the hydrodynamic forces of the tuna’s body increase synchronously due to the interaction between the body and the median fins, which is also very beneficial to the yaw motion. This study indicates that tuna can use the morphing median fins to adjust its mobility and stability, which provides a new idea for the design of robotic fish.

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“…In recent years, the application of bionics had attracted more and more attention of the researchers (Xue et al 2016;Hua et al 2019;Yang et al 2017;Gu et al 2019;Cheng et al 2020;Huang et al 2019). Some sinusoidal tubercles are growing in the pectoral fins of humpback, which allows them to move freely in the ocean.…”

Section: Introductionmentioning

confidence: 99%

Research on the Rotor-Stator Interaction of Centrifugal Pump based on Sinusoidal Tubercle Volute Tongue

Lin

Song

Zhu

et al. 2021

JAFM

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The rotor-stator interaction between the impeller and the volute is the main reason for the pump pressure pulsation and vibration. This work aims at designing a new type of tongue to minimize pressure pulsation, reduce vibration noise and energy loss. Inspired by the humpback pectoral fin, four volute tongues are investigated in this paper, three of which are sinusoidal tubercle volute tongues (STVT) and one is the original volute tongue (OVT). Based on the detached-eddy simulation (DES) turbulence model, the influence of the sinusoidal tubercle volute tongues on the pressure pulsation was investigated, and the flow structure and enstrophy of the four pumps were analyzed, aiming to minimize pressure pulsation, maximize hydraulic performance and reduce the energy dissipation in centrifugal pumps. The results show that the pressure pulsations of the STVT profiles are all lower. The reductions of the average pressure pulsation at the monitoring points are 13.3% (STVT-1), 20.6% (STVT-2), and 16.2% (STVT-3), respectively. The difference in pressure pulsation at the monitoring points closer to the tongue is more obvious. At the design flow rate, the efficiencies of the three bionic pumps are increased by 0.5% (STVT-1), 1.5% (STVT-2), 0.9% (STVT-3), respectively. The STVT profiles change the vortex structure near the tongue and minimized the vortex strength. Meanwhile, the flow in the pump with the STVT profiles have lower enstrophy. The enstrophy of the flow with the STVT-2 profile is the lowest, which is reduced by about 8%. This reduces the dissipation of mechanical energy. The results can be used as a guide for pump design optimization.

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Numerical Analysis of Hydrodynamics for Bionic Oscillating Hydrofoil Based on Panel Method

Cited by 11 publications

References 14 publications

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

Hydrodynamic Analysis for the Morphing Median Fins of Tuna during Yaw Motions

Research on the Rotor-Stator Interaction of Centrifugal Pump based on Sinusoidal Tubercle Volute Tongue

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