A fluid-structure interaction solver for the study on a passively deformed fish fin with non-uniformly distributed stiffness

Yang Luo, Qing Xiao, Guangyu Shi, Li Wen, Daoyi Chen, Guang Pan

Research output: Contribution to journalArticle

Abstract

Research on fish locomotion has made extensive progress towards a better understanding of how fish control their flexible body and fin for propulsion and maneuvering. Although the biologically flexible fish fins are believed to be one of the most important features to achieve optimal swimming performance, due to the limitations of the existing numerical modeling tool, studies on a deformable fin with a non-uniformly distributed stiffness are rare. In this work, we present a fully coupled fluid-structure interaction solver which can cope with the dynamic interplay between flexible aquatic animal and the ambient medium. In this tool, the fluid is resolved by solving Navier-Stokes equations based on the finite volume method with a multi-block grid system. The solid dynamics is solved by a nonlinear finite element method. A sophisticated improved IQN-ILS coupling algorithm is employed to stabilize solution and accelerate convergence. To demonstrate the capability of the developed Fluid-Structure-Interaction solver, we investigated the effect of five different stiffness distributions on the propulsive performance of a caudal peduncle-fin model. It is shown that with a non-uniformly distributed stiffness along the surface of the caudal fin, we are able to replicate similar real fish fin deformation. Consistent with the experimental observations, our numerical results also indicate that the fin with a cupping stiffness profile generates the largest thrust and efficiency whereas a heterocercal flexible fin yields the least propulsion performance but has the best maneuverability.
Original languageEnglish
Article number102778
Number of pages24
JournalJournal of Fluids and Structures
Volume92
Early online date8 Nov 2019
DOIs
Publication statusE-pub ahead of print - 8 Nov 2019

Fingerprint

Fluid structure interaction
Fish
Stiffness
Propulsion
Maneuverability
Finite volume method
Navier Stokes equations
Animals
Finite element method
Fluids

Keywords

  • fish locomotion
  • fluid-structure interactions
  • FSI
  • fluid forces
  • autonomous underwater vehicles
  • AUV

Cite this

@article{19355fda9bfc48df87661741e5864b72,
title = "A fluid-structure interaction solver for the study on a passively deformed fish fin with non-uniformly distributed stiffness",
abstract = "Research on fish locomotion has made extensive progress towards a better understanding of how fish control their flexible body and fin for propulsion and maneuvering. Although the biologically flexible fish fins are believed to be one of the most important features to achieve optimal swimming performance, due to the limitations of the existing numerical modeling tool, studies on a deformable fin with a non-uniformly distributed stiffness are rare. In this work, we present a fully coupled fluid-structure interaction solver which can cope with the dynamic interplay between flexible aquatic animal and the ambient medium. In this tool, the fluid is resolved by solving Navier-Stokes equations based on the finite volume method with a multi-block grid system. The solid dynamics is solved by a nonlinear finite element method. A sophisticated improved IQN-ILS coupling algorithm is employed to stabilize solution and accelerate convergence. To demonstrate the capability of the developed Fluid-Structure-Interaction solver, we investigated the effect of five different stiffness distributions on the propulsive performance of a caudal peduncle-fin model. It is shown that with a non-uniformly distributed stiffness along the surface of the caudal fin, we are able to replicate similar real fish fin deformation. Consistent with the experimental observations, our numerical results also indicate that the fin with a cupping stiffness profile generates the largest thrust and efficiency whereas a heterocercal flexible fin yields the least propulsion performance but has the best maneuverability.",
keywords = "fish locomotion, fluid-structure interactions, FSI, fluid forces, autonomous underwater vehicles, AUV",
author = "Yang Luo and Qing Xiao and Guangyu Shi and Li Wen and Daoyi Chen and Guang Pan",
year = "2019",
month = "11",
day = "8",
doi = "10.1016/j.jfluidstructs.2019.102778",
language = "English",
volume = "92",
journal = "Journal of Fluids and Structures",
issn = "0889-9746",

}

TY - JOUR

T1 - A fluid-structure interaction solver for the study on a passively deformed fish fin with non-uniformly distributed stiffness

AU - Luo, Yang

AU - Xiao, Qing

AU - Shi, Guangyu

AU - Wen, Li

AU - Chen, Daoyi

AU - Pan, Guang

PY - 2019/11/8

Y1 - 2019/11/8

N2 - Research on fish locomotion has made extensive progress towards a better understanding of how fish control their flexible body and fin for propulsion and maneuvering. Although the biologically flexible fish fins are believed to be one of the most important features to achieve optimal swimming performance, due to the limitations of the existing numerical modeling tool, studies on a deformable fin with a non-uniformly distributed stiffness are rare. In this work, we present a fully coupled fluid-structure interaction solver which can cope with the dynamic interplay between flexible aquatic animal and the ambient medium. In this tool, the fluid is resolved by solving Navier-Stokes equations based on the finite volume method with a multi-block grid system. The solid dynamics is solved by a nonlinear finite element method. A sophisticated improved IQN-ILS coupling algorithm is employed to stabilize solution and accelerate convergence. To demonstrate the capability of the developed Fluid-Structure-Interaction solver, we investigated the effect of five different stiffness distributions on the propulsive performance of a caudal peduncle-fin model. It is shown that with a non-uniformly distributed stiffness along the surface of the caudal fin, we are able to replicate similar real fish fin deformation. Consistent with the experimental observations, our numerical results also indicate that the fin with a cupping stiffness profile generates the largest thrust and efficiency whereas a heterocercal flexible fin yields the least propulsion performance but has the best maneuverability.

AB - Research on fish locomotion has made extensive progress towards a better understanding of how fish control their flexible body and fin for propulsion and maneuvering. Although the biologically flexible fish fins are believed to be one of the most important features to achieve optimal swimming performance, due to the limitations of the existing numerical modeling tool, studies on a deformable fin with a non-uniformly distributed stiffness are rare. In this work, we present a fully coupled fluid-structure interaction solver which can cope with the dynamic interplay between flexible aquatic animal and the ambient medium. In this tool, the fluid is resolved by solving Navier-Stokes equations based on the finite volume method with a multi-block grid system. The solid dynamics is solved by a nonlinear finite element method. A sophisticated improved IQN-ILS coupling algorithm is employed to stabilize solution and accelerate convergence. To demonstrate the capability of the developed Fluid-Structure-Interaction solver, we investigated the effect of five different stiffness distributions on the propulsive performance of a caudal peduncle-fin model. It is shown that with a non-uniformly distributed stiffness along the surface of the caudal fin, we are able to replicate similar real fish fin deformation. Consistent with the experimental observations, our numerical results also indicate that the fin with a cupping stiffness profile generates the largest thrust and efficiency whereas a heterocercal flexible fin yields the least propulsion performance but has the best maneuverability.

KW - fish locomotion

KW - fluid-structure interactions

KW - FSI

KW - fluid forces

KW - autonomous underwater vehicles

KW - AUV

UR - https://www.sciencedirect.com/journal/journal-of-fluids-and-structures

U2 - 10.1016/j.jfluidstructs.2019.102778

DO - 10.1016/j.jfluidstructs.2019.102778

M3 - Article

VL - 92

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

SN - 0889-9746

M1 - 102778

ER -