Hydrodynamic performance study on a hinge-connected flexible fin by fluid-structure interaction

2016 ◽  
Author(s):  
Bo Liu ◽  
Zhongze Guo ◽  
Qin Yan ◽  
Bin Liao
Keyword(s):  
Fluid Structure Interaction ◽  
Hydrodynamic Performance ◽  
Performance Study ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Flexible Fin

Fluid-Structure Interaction Analysis of a Soft Robotic Fish Using Piezoelectric Fiber Composite

2014 ◽  
Vol 26 (5) ◽  
pp. 638-648 ◽  
Author(s):  
Wenjing Zhao ◽  
◽  
Aiguo Ming ◽  
Makoto Shimojo ◽  
Yohei Inoue ◽  
...  
Keyword(s):  
Fiber Composite ◽  
Fluid Structure Interaction ◽  
Robotic Fish ◽  
Hydrodynamic Performance ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Analysis Scheme ◽  
Piezoelectric Fiber Composite ◽  
Surrounding Fluid ◽  
Piezoelectric Fiber

<div class=""abs_img""><img src=""[disp_template_path]/JRM/abst-image/00260005/13.jpg"" width=""300"" />Model of soft robotic fish</div> Designing a high-performance soft robotic fish requires considering the interaction between the flexible robot structure and surrounding fluid. This paper introduces fluid-structure interaction (FSI) analysis used to enhance the hydrodynamic performance of soft robotic fish using piezoelectric fiber composite (PFC) as the propulsion actuator. The basic FSI analysis scheme for soft robotic fish is presented, then the numerical model of the actuator, robot structure, and surrounding fluid are described based on the FSI analysis scheme. The FSI analysis of the soft robotic fish is performed through these numerical models. To evaluate the effectiveness of FSI analysis, coupling simulation and experimental results are compared. We found that the calculated results of propulsive force and deformation displacement were similar to those for experiments. These results suggest that FSI analysis is useful and is applicable to evaluating propulsion characteristics of the soft robotic fish to improve performance. </span>

A Study on Fluid-Structure Interaction Performance of a Flexible Hydrofoil

2018 ◽  
Author(s):  
Zheng Huang ◽  
Ying Xiong ◽  
Ye Xu ◽  
Shancheng Li
Keyword(s):  
Center Of Pressure ◽  
Separation Bubble ◽  
Fluid Structure Interaction ◽  
Angle Of Attack ◽  
Leading Edge ◽  
Hydrodynamic Performance ◽  
Fluid Structure ◽  
Maximum Deformation ◽  
Structure Interaction ◽  
Turbulent Transition

To research the flexible hydrofoils’ hydroelastic response, the fluid-structure interaction (FSI) characteristic investigation is conducted on the basis of the analysis of a rigid hydrofoil’s hydrodynamic performance. For a rigid cantilevered rectangular hydrofoil, the pitching hydrodynamic performance is calculated using boundary motion with remeshing strategy. The Laminar Separation Bubble (LSB) and turbulent transition are captured. Numerical flow analysis revealed that the LSB occurs at 0.8c when pitching at initial angle of attack. As the angle increases to 5.1°, the laminar to turbulent transition occurs and the lift presents an inflection. For a geometric equivalent flexible hydrofoil, the static FSI characteristic is researched using oneway and two-way FSI method. The lift decreases and the drag increases using two-way compared to one-way FSI. The center of pressure and the maximum deformation move from trailing edge to leading edge as the angle of attack increases, showing the necessary of two-way FSI calculation. The transient FSI characteristic of the flexible hydrofoil is then studied using LES model. The lift fluctuation at 8° in frequency domain is calculated . The dry mode and wet mode natural frequency of the flexible hydrofoil are calculated to simulate the vibration performance, which meet the experiment data quite well, laying foundation for further research on the hydroelastic vibration response.

Numerical Fluid-Structure Interaction Analysis for a Flexible Marine Propeller Using Co-Simulation Method

2021 ◽  
Vol 163 (A2) ◽  
Author(s):  
A Kumar ◽  
R Vijayakumar ◽  
VA Subramanian
Keyword(s):  
Carbon Fibre ◽  
Interaction Analysis ◽  
Fibre Composite ◽  
Fluid Structure Interaction ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Marine Propeller ◽  
Carbon Fibre Composite ◽  
Fluid Structure ◽  
Structure Interaction

Carbon fibre composite has exceptionally high strength, low density and corrosion resistance in the marine environment compared to conventional materials. These characteristics make it a favourable alternative material to be considered for manufacturing marine screw propellers. Despite these advantages, the flexibility of the material leads to a significant change in blade geometry due to loads acting on blades which alter hydrodynamic performance. A two-way coupled fluid-structure interaction analysis is required to accurately capture its hydrodynamic performance due to the reduced stiffness and material anisotropy. The present study focuses on numerical investigation for the hydro-elastic based performance analysis of a composite marine propeller in open water condition. The procedure involves the coupling of Reynolds-Averaged Navier-Stokes Equation based computational fluid dynamics solver with the finite element method solver using co-simulation technique. The open water characteristics, including thrust coefficient, torque coefficient and open water efficiency, are discussed as a function of advance ratio. This paper presents a comparison of the hydrodynamic performance and structural responses between a carbon fibre composite propeller and a conventional steel propeller which are geometrically identical. The results for the composite propeller show a significant improvement in hydrodynamic performance compared to the metallic propeller while remaining structurally safe throughout the tested range.

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