A method for improving the simulation efficiency of trawl based on simulation stability criterion

Yao, Yeming; Chen, Yinglong; Zhou, Hua; Yang, Huayong

doi:10.1016/j.oceaneng.2016.03.031

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…As shown by the literature review, there are also differences in the cutting ratio of the codend to suit target species. Kumazawa et al [20], Zhou et al [21,22], and Yao et al [23] investigated the drag characteristics of the midwater trawl, but different cutting ratios of codend structures exist. To date, it has not been determined whether the cutting ratio can be adjusted to reduce the drag force and improve the stability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Liu

Tang

You

et al. 2021

JMSE

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The codend of a trawl net is the rearmost and crucial part of the net for selective fish catch and juvenile escape. To ensure efficient and sustainable midwater trawl fisheries, it is essential to better understand the drag characteristics and fluttering motions of a midwater trawl codend. These are generally affected by catch, cutting ratio, mesh size, and twine diameter. In this study, six nylon codend models with different cutting ratios (no cutting, 6:1, 5:1, 4:1, 7:2, and 3:1) were designed and tested in a professional flume tank under two conditions (empty codends and codends with catch) and five current speeds to obtain the drag force, spatial geometry, and movement trend. As the cutting ratio of empty codends decreased, the drag force decreased, and the drag coefficient increased. The unfolding degree of codend netting and the height of empty codends were found to be directly proportional to the current speed and inversely proportional to the cutting ratio. The positional amplitude of codend with cutting ratio 4:1 was the smallest for catch. The drag force of codends with catch increased as the current speed increased, and first decreased and then increased as the cutting ratio decreased. To ensure the best stability and minimum drag force of the codend, it is recommended to use the 4:1 cutting ratio codend.

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Section: Introductionmentioning

confidence: 99%

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Liu

Tang

You

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…These segments can be flexible or rigid along their longitudinal axis, or a combination of both [14]. Linear spring models [29,48], are instances of the first kind; structural damping can be included in these flexible elements as well [8,59]. These models have been demonstrated to work well in the dynamic simulation of towed gears, and they show good agreement with experimental results [50,57].…”

Section: Introductionmentioning

confidence: 91%

Real-time simulation of cable pay-out and reel-in with towed fishing gears

et al. 2017

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Achieving real-time simulation of fast cable pay-out and reel-in manoeuvres with towed fishing gears is a challenging task. This work presents two new simulation methods based on simplified cable models for this kind of application. First, three numerical techniques are proposed to enhance a classical spring-based cable model, increasing its computational efficiency in manoeuvres that involve reeling the cable around a winch drum. Second, the development of an efficient multibody modelling approach based on natural coordinates is reported. The performance of these methods was assessed with two realistic examples. The numerical experiments involved different values of cable axial stiffness and spatial discretization levels, since these parameters were found to have a major impact on computational efficiency. The proposed methods achieved real-time performance in the simulation of systems modelled with up to a few thousand variables. Each modelling approach has advantages and limitations that must be considered when addressing a given application.

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“…Some researchers simplify the trawl net as severally mass points within the vertical plane to describe the dynamic behavior (Hu et al, 1995(Hu et al, , 2001Lee et al, 2000Lee et al, , 2002Yonezawa et al, 2009). In order to describe the behavior of the trawl net in space, complex theoretical models for fishing gears are also developed, and the trawl net is composed of huge amount masses that can interpret the shape of the trawl net in detail (Bessonneau et al, 1998;Takagi et al, 2002;Lee et al, 2005;Sun et al, 2011;Khaled et al, 2012;Chen et al, 2014;Yao et al, 2016a;Tang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Untitled

Chen¹,

Yao²

2020

Turk. J. Fish. Aquat. Sci.

Self Cite

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Trawl nets are mostly flexible structures working in the water. In order to investigate the effect of the fluid-structure interaction on the trawl net's numerical model, we modeled the trawl net and the flow field based on lumped mass method and finite volume method, separately; then we adopted a hybrid volume method (HVM) to model the fluid-structure interaction between the net and surrounding water. Since the gridding of trawl net is independent of its shape within the proposed HVM, large mesh can be used for the calculation of fluid-structure coupling model for higher efficiency. First, existing flume tank experimental data were used to verify the accuracy of the HVM. Then, trawl net states were analyzed based on the HVM by taking the fluid-structure coupling into consideration. The simulation reveals that difference between the trawl net model with and without fluid-structure interaction is about 6%, the main reason for that is the relative velocity of water flow around the codend is only 1/5 of the towing speed because of the flow blocking by the trawl mesh upstream. The above results indicate that fluid-structure interaction is very important for the analysis of trawl net which should not be ignored when numerical modelling.

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A method for improving the simulation efficiency of trawl based on simulation stability criterion

Cited by 8 publications

References 18 publications

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

Real-time simulation of cable pay-out and reel-in with towed fishing gears

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