Wake Tracking and the Detection of Vortex Rings by the Canal Lateral Line of Fish

Franosch, Jan-Moritz P.; Hagedorn, Hendrik J. A.; Goulet, Julie; Engelmann, Jacob; Hemmen, J. Leo van

doi:10.1103/physrevlett.103.078102

Cited by 24 publications

(19 citation statements)

References 18 publications

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“…The sensing of the turbulent wake behind a cylinder using a virtual sensor has been described previously by Akanyeti et al [10], and object identification using pressure sensors has been completed for static arrays [11][12][13]. Further wake navigation algorithms have been previously developed based on the predicted pressure signal [14].…”

Section: Introductionmentioning

confidence: 99%

A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow

Chambers

Akanyeti

Venturelli

et al. 2014

J. R. Soc. Interface.

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For underwater vehicles to successfully detect and navigate turbulent flows, sensing the fluid interactions that occur is required. Fish possess a unique sensory organ called the lateral line. Sensory units called neuromasts are distributed over their body, and provide fish with flow-related information. In this study, a three-dimensional fish-shaped head, instrumented with pressure sensors, was used to investigate the pressure signals for relevant hydrodynamic stimuli to an artificial lateral line system. Unsteady wakes were sensed with the objective to detect the edges of the hydrodynamic trail and then explore and characterize the periodicity of the vorticity. The investigated wakes (Kármán vortex streets) were formed behind a range of cylinder diameter sizes (2.5, 4.5 and 10 cm) and flow velocities (9.9, 19.6 and 26.1 cm s 21 ). Results highlight that moving in the flow is advantageous to characterize the flow environment when compared with static analysis. The pressure difference from foremost to side sensors in the frontal plane provides us a useful measure of transition from steady to unsteady flow. The vortex shedding frequency (VSF) and its magnitude can be used to differentiate the source size and flow speed. Moreover, the distribution of the sensing array vertically as well as the laterally allows the Kármán vortex paired vortices to be detected in the pressure signal as twice the VSF.

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Section: Introductionmentioning

confidence: 99%

A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow

Chambers

Akanyeti

Venturelli

et al. 2014

J. R. Soc. Interface.

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“…When the source vibrates, a force is generated on the surrounding water flow that gives rise to changes in the flow environ ment [28][29][30]. Applying Newton's second law to a small volume element in the fluid (see figure 1) we get…”

Section: Euler Equationsmentioning

confidence: 99%

“…However, the energy is limited. The fluid movement is mainly concentrated in the water area near the vibrating object [28,29]. The instantaneous displacement of the ball vibration can be expressed as [30,31] …”

Section: Plane Potential Flow Theorymentioning

confidence: 99%

A novel biomimetic sensor system for vibration source perception of autonomous underwater vehicles based on artificial lateral lines

Liu

Gao

Sarkodie-Gyan

et al. 2018

Meas. Sci. Technol.

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The perception of vibration sources can be used to detect, classify, locate, and track autonomous underwater vehicles (AUVs), which is of great importance for ocean scientific research and naval applications. The artificial lateral lines system (ALLS) is a promising technique to sense underwater vibration sources. However, most current ALLS research focuses on perception mechanism and biomimetic sensor design. The design of a systematic ALLS that is ready for practical applications is still an unsolved problem. To this end, a novel biomimetic sensor system is proposed in this work for the purpose of developing a practical ALLS for AUVs. In order to determine the distribution of the developed biomimetic sensors in the AUVs, hydromechanics modelling and simulation of the artificial lateral lines were implemented to investigate the pressure response mechanisms of the AUVs in terms of the position, frequency and amplitude of the vibration source(s). Subsequently, an experimental AUV was equipped with biomimetic sensors to evaluate the performance of the vibration source perception. Experimental tests were conducted to analyze the relationship between the measured AUV pressure and the distance, frequency and amplitude of the vibration source. Analysis results demonstrate that the experimental measurements were consistent with simulation results. Based on the relationship between the sensor measurements and the vibration source, a neural network model was used to identify the coordinates, frequency and amplitude of the vibration source, producing an identification accuracy of 93%. Hence, the proposed ALLS is effective for vibration source perception of AUVs.

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“…From a scientific perspective they pose many interesting and theoretically challenging questions. This paper was perhaps the first to study wave motion on the vortex core and to attempt to describe the initial roll-up of the fluid exiting the gun.A quick search in recent literature highlights the importance of vortex rings in the natural and manufactured world, ranging from fish swimming [4] and inter-fish communication [5] to insect flight [6] to manufactured jet propulsion [7] or robotics problems [8]. The beauty, complexity and universality of vortex rings is perhaps best summarized in the oft-quoted words of the late Phillip Saffman (1981) [9]: "One particular motion exemplifies the whole range of problems of vortex motion and is also a commonly known phenomenon, namely the vortex ring... Their formation is a problem of vortex sheet dynamics, the steady state is a problem of existence, their duration is a problem of stability, and if there are several we have a problem of vortex interactions.…”

mentioning

confidence: 99%

An appreciation of the 1939 paper “On an experimentally observed phenomenon on vortex rings ...” by Carl‐Heinz Krutzsch

2011

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Why then do we feel that this paper, now over 70 years old, is still worth reading? The first thing we notice, of course, is the subject matter. Vortex rings have been a subject of great fascination to fluid dynamicists for a very long time, dating back to Reynolds in 1876 [1] or even earlier to Rogers in 1858 [2], the founder of MIT. This initial interest is in part due to Lord Kelvin's idea that such rings were a model of atoms [3] (at the time Lord Kelvin was Sir William Thomson). Like many subjects in fluid mechanics, it is one where interest in the community has been up and down, but it is one in which there has always been interest. They are visually stunning phenomena, which can capture even lay peoples' interest. From a scientific perspective they pose many interesting and theoretically challenging questions. This paper was perhaps the first to study wave motion on the vortex core and to attempt to describe the initial roll-up of the fluid exiting the gun.A quick search in recent literature highlights the importance of vortex rings in the natural and manufactured world, ranging from fish swimming [4] and inter-fish communication [5] to insect flight [6] to manufactured jet propulsion [7] or robotics problems [8]. The beauty, complexity and universality of vortex rings is perhaps best summarized in the oft-quoted words of the late Phillip Saffman (1981) [9]: "One particular motion exemplifies the whole range of problems of vortex motion and is also a commonly known phenomenon, namely the vortex ring... Their formation is a problem of vortex sheet dynamics, the steady state is a problem of existence, their duration is a problem of stability, and if there are several we have a problem of vortex interactions."The second thing we would like to highlight from the Krutzsch paper is the exceptionally fine quality of the photographs. As with any good scientific paper, the high quality images convey much of the information in the article, which we believe gave rise to its interest by the scientific community despite any challenges *

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Wake Tracking and the Detection of Vortex Rings by the Canal Lateral Line of Fish

Cited by 24 publications

References 18 publications

A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow

A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow

A novel biomimetic sensor system for vibration source perception of autonomous underwater vehicles based on artificial lateral lines

An appreciation of the 1939 paper “On an experimentally observed phenomenon on vortex rings ...” by Carl‐Heinz Krutzsch

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