Investigations on the porous resistance coefficients for fishing net structures

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Abstract

The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.
Original languageEnglish
JournalJournal of Fluids and Structures
Volume65
Pages (from-to)76-107
ISSN0889-9746
DOIs
Publication statusPublished - 2016

Keywords

  • Mechanical Engineering
  • Fishing nets
  • Navier-Stokes equations
  • Porous media model
  • Resistance coefficients

Cite this

@article{f3fc614bb5de4d64bc700390769b791c,
title = "Investigations on the porous resistance coefficients for fishing net structures",
abstract = "The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.",
keywords = "Mechanical Engineering, Fishing nets, Navier-Stokes equations, Porous media model, Resistance coefficients",
author = "Hao Chen and Christensen, {Erik Damgaard}",
year = "2016",
doi = "10.1016/j.jfluidstructs.2016.05.005",
language = "English",
volume = "65",
pages = "76--107",
journal = "Journal of Fluids and Structures",
issn = "0889-9746",
publisher = "Academic Press",

}

Investigations on the porous resistance coefficients for fishing net structures. / Chen, Hao; Christensen, Erik Damgaard.

In: Journal of Fluids and Structures, Vol. 65, 2016, p. 76-107.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Investigations on the porous resistance coefficients for fishing net structures

AU - Chen, Hao

AU - Christensen, Erik Damgaard

PY - 2016

Y1 - 2016

N2 - The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.

AB - The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.

KW - Mechanical Engineering

KW - Fishing nets

KW - Navier-Stokes equations

KW - Porous media model

KW - Resistance coefficients

U2 - 10.1016/j.jfluidstructs.2016.05.005

DO - 10.1016/j.jfluidstructs.2016.05.005

M3 - Journal article

VL - 65

SP - 76

EP - 107

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

SN - 0889-9746

ER -