Numerical investigation on the swimming mode and stable spacing with two self-propelled fish arranged in tandem

Ren, Kai; Yu, Jiancheng; Li, Hongbo; Feng, Hao

doi:10.1016/j.oceaneng.2022.111861

Cited by 12 publications

(5 citation statements)

References 36 publications

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“…In this process, CFD numerical simulations have made significant contributions to the research of many scholars. Numerous researchers have investigated the hydrodynamic performance of robotic fish using this method [3,[90][91][92], advancing future related research. Lamas and Rodriguez [93] conducted a comprehensive review of numerical simulations in hydrodynamics and biomimetic propulsion, highlighting the importance of numerical simulations in studying fish swimming patterns.…”

Section: Biomimetic Robotic Fish Propulsionmentioning

confidence: 99%

“…In their study of fish schooling behavior, Li et al [104] investigated both the hydrodynamic characteristics and flow field structures of fish schools across various vertical modes, aiming to enhance the swimming efficiency of robotic fish schools. Pan and Dong [105], along with Ren et al [92], conducted numerical simulations on fish in highdensity, diamond-shaped schools to analyze the hydrodynamic interactions within the school. They discovered that fish in dense schools exhibit both higher thrust and improved propulsive efficiency compared with those in sparse schools, primarily due to the pronounced wall effect.…”

Section: Biomimetic Robotic Fish Propulsionmentioning

confidence: 99%

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Review of Computational Fluid Dynamics Analysis in Biomimetic Applications for Underwater Vehicles

Zhang,

Wang,

Zhang

2024

Biomimetics

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Biomimetics, which draws inspiration from nature, has emerged as a key approach in the development of underwater vehicles. The integration of this approach with computational fluid dynamics (CFD) has further propelled research in this field. CFD, as an effective tool for dynamic analysis, contributes significantly to understanding and resolving complex fluid dynamic problems in underwater vehicles. Biomimetics seeks to harness innovative inspiration from the biological world. Through the imitation of the structure, behavior, and functions of organisms, biomimetics enables the creation of efficient and unique designs. These designs are aimed at enhancing the speed, reliability, and maneuverability of underwater vehicles, as well as reducing drag and noise. CFD technology, which is capable of precisely predicting and simulating fluid flow behaviors, plays a crucial role in optimizing the structural design of underwater vehicles, thereby significantly enhancing their hydrodynamic and kinematic performances. Combining biomimetics and CFD technology introduces a novel approach to underwater vehicle design and unveils broad prospects for research in natural science and engineering applications. Consequently, this paper aims to review the application of CFD technology in the biomimicry of underwater vehicles, with a primary focus on biomimetic propulsion, biomimetic drag reduction, and biomimetic noise reduction. Additionally, it explores the challenges faced in this field and anticipates future advancements.

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Section: Biomimetic Robotic Fish Propulsionmentioning

confidence: 99%

Section: Biomimetic Robotic Fish Propulsionmentioning

confidence: 99%

Review of Computational Fluid Dynamics Analysis in Biomimetic Applications for Underwater Vehicles

Zhang,

Wang,

Zhang

2024

Biomimetics

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“…The hydrodynamic performance of a swimmer can be evaluated with the Froude efficiency [15,17]. However, this efficiency could not be used in a steady self-propelled swimmer since the net propulsion force is nearly zero, and precisely distinguishing thrust and drag is difficult [14]. Therefore, the cost of transportation (CoT) has been adopted by several studies to evaluate the energy efficiency of a self-propelled swimmer [14,33,38,40,83,84].…”

Section: Different Formations and Their Performancementioning

confidence: 99%

“…However, the accuracy of live fish experiments is still in debate since the behavior and energetic cost of a live fish may be influenced by social and psychological factors [14]. A variety of experiments and numerical simulations on the flapping foils and flexible bodies also support this hypothesis, since enhanced thrust or efficiency are observed in different arrangements [15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…In the past a few years, several 1-degree-of-freedom (DoF) self-propelled models are proposed to test this hypothesis, in which the foils are free in the longitudinal direction but constrained in the lateral direction and the rotation [26]. when applying those models in the collective motion of two rigid foils or flexible bodies, several stable configurations are spontaneously formed and self-sustained purely by the fluid-body interactions, including in-line, side-byside, and staggered formations [14,[31][32][33][34][35][36][37][38][39][40]. However, those results are challenged by some recent works on the 2-DoF schooling of a two-body system in which the foils can self-propel in both longitudinal and lateral directions.…”

Section: Introductionmentioning

confidence: 99%

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Learning to school in dense configurations with multi-agent deep reinforcement learning

et al. 2022

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Fish are observed to school in different configurations. However, how and why fish maintain a stable schooling formation still remains unclear. This work presents a numerical study of the dense schooling of two freely-swimming swimmers by a hybrid method of the multi-agent deep reinforcement learning and the immersed boundary-lattice Boltzmann method. Active control policies are developed by synchronously training the leader to swim at given speed and orientation and the follower to hold close proximity to the leader. After training, the swimmers could resist the strong hydrodynamic force to remain in stable formations and meantime swim in desired path, only by their tail-beat flapping. The tail movement of the swimmers in the stable formations are irregular and asymmetrical, indicating the swimmers are carefully adjusting their body-kinematics to balance the hydrodynamic force. In addition, a significant decrease in the mean amplitude and cost of transport is found for the follower in the latter two cases, indicating these swimmers could maintain the swimming speed with less efforts. The results also show that the side-by-side formation is hydrodynamically more stable but energetically less efficient than other configurations, while the full-body staggered formation is energetically more efficient as a whole.

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Effect of leading and secondary vortices on the propulsion performance of an undulating swimmer in the periodic vortex street

Li,

Wang,

Jia

et al. 2024

Applied Ocean Research

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Numerical investigation on the swimming mode and stable spacing with two self-propelled fish arranged in tandem

Cited by 12 publications

References 36 publications

Review of Computational Fluid Dynamics Analysis in Biomimetic Applications for Underwater Vehicles

Review of Computational Fluid Dynamics Analysis in Biomimetic Applications for Underwater Vehicles

Learning to school in dense configurations with multi-agent deep reinforcement learning

Effect of leading and secondary vortices on the propulsion performance of an undulating swimmer in the periodic vortex street

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