Comparative study of the virtual flux method and immersed boundary method coupled with regularized lattice Boltzmann method for suspension flow simulations

Kawaguchi, Misa; Fukui, Tsuguya; Morinishi, Koji

doi:10.1016/j.compfluid.2022.105615

Cited by 7 publications

(8 citation statements)

References 51 publications

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“…It also has the advantage of capturing the pressure field around the object more sharply than other calculation methods, such as the immersed boundary method. Furthermore, it has the advantage of superior computational efficiency compared to the immersed boundary method [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Numerical Study of Hydrodynamic Interactions between Pectoral Fins and the Body of Aquatic Organisms

Morifusa,

Fukui

2024

Biomimetics

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Fish swimming has attracted attention as a locomotion system with excellent propulsive efficiency. They swim by moving their body, fins, and other organs simultaneously, which developed during evolution. Among their many organs, the pectoral fin plays a crucial role in swimming, such as forward–backward movement and change of direction. In order to investigate the hydrodynamic interaction between pectoral fins and fish bodies, we examined the asymmetric flapping motion of the pectoral fin concerning the body axis and investigated the effect of the pectoral fin on the propulsive performance of the body of a small swimming object by numerical simulation. In this study, the amplitude ratio, frequency ratio, and phase of the body and pectoral fin varied. Therefore, although propulsive performance increased in tandem with the frequency ratio, the amplitude ratio change had negatively affected the propulsive performance. The results revealed that the propulsive performance of the fish was high even in low-frequency ratios when the phase difference was varied. The highest propulsion efficiency increased by a factor of about 3.7 compared to the phase difference condition of 0.

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Section: Methodsmentioning

confidence: 99%

Three-Dimensional Numerical Study of Hydrodynamic Interactions between Pectoral Fins and the Body of Aquatic Organisms

Morifusa,

Fukui

2024

Biomimetics

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“…In this study, the virtual flux method (Tanno et al, 2006;Morinishi and Fukui, 2012) was used to represent arbitrary objects such as a curvilinear channel and a circular particle on a Cartesian grid. This method is very advantageous because it is based on a simple algorithm, it can be easily implemented, and is more efficient than IBM for parallel computation (Kawaguchi et al, 2022). A schematic diagram of the virtual flux method is shown in Fig.…”

Section: Virtual Flux Methodsmentioning

confidence: 99%

Numerical simulation of microscopic particle behavior and macroscopic relative viscosity of suspension with asymmetric flow field in a two-dimensional curvilinear channel

IIDA,

FUKUI

2024

JFST

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Biomechanics is a field for mechanical study of the structure and function of living organisms, which finds many applications in various fields such as engineering, medicine and biology. Research in blood, systems showed that the blood volume is effectively changed by the strength and direction of shear stress on the vessel wall, also inducing changes in the vessel diameter. Most studies about wall shear stress in bends or branches are based on macroscopic single-phase flow, and more studies should be necessary to investigate wall shear stress distribution by multi-phase flow considering blood as a suspension. In this study, we focused on the flow characteristics of particle suspension, and aimed to analyze a flow field with asymmetrical differences in the shear stress on each wall of a two-dimensional (2D) parallel plates flow, i.e., a flow field with an asymmetric velocity profile. A 2D curvilinear channel was used to reproduce this flow field, and the regularized lattice Boltzmann method and the virtual flux method were used as the computational methods. Our results confirmed that the equilibrium positions were either two asymmetric points or a single point, depending on the radius of curvature of the channel and Reynolds number. The radial pressure gradient was found to be a major factor for the presence of a single equilibrium position. Furthermore, when the radius of curvature was decreased, the equilibrium position shifted closer to the inner wall side, and the relative viscosity of the suspension became higher because of the decreasing the distance between the particle and the inner wall.

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“…In this study, the virtual flux method (VFM) [32][33][34] was used to represent insect wings on a Cartesian grid. This method has several advantages.…”

Section: Virtual Flux Methodsmentioning

confidence: 99%

Numerical Simulation of the Advantages of the Figure-Eight Flapping Motion of an Insect on Aerodynamics under Low Reynolds Number Conditions

Yoshida,

Fukui

2024

Biomimetics

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In proceeding with the advanced development of small unmanned aerial vehicles (UAVs), which are small flying machines, understanding the flight of insects is important because UAVs that use flight are attracting attention. The figure-eight trajectory of the wing tips is often observed in the flight of insects. In this study, we investigated the more efficient figure-eight motion patterns in generating lift during the hovering motion and the relationship between figure-eight motion and Reynolds number. For this purpose, we compared the ratios of the cycle-averaged lift coefficient to the power coefficient generated from each motion by varying the elevation motion angle, which is the rotational motion that represents the figure-eight motion, and the Reynolds number. The result showed that the motion with a smaller initial phase of the elevation motion angle (φe0≤90°) could generate lift more efficiently at all Reynolds numbers. In addition, the figure-eight motion was more effective when the Reynolds number was low.

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Comparative study of the virtual flux method and immersed boundary method coupled with regularized lattice Boltzmann method for suspension flow simulations

Cited by 7 publications

References 51 publications

Three-Dimensional Numerical Study of Hydrodynamic Interactions between Pectoral Fins and the Body of Aquatic Organisms

Three-Dimensional Numerical Study of Hydrodynamic Interactions between Pectoral Fins and the Body of Aquatic Organisms

Numerical simulation of microscopic particle behavior and macroscopic relative viscosity of suspension with asymmetric flow field in a two-dimensional curvilinear channel

Numerical Simulation of the Advantages of the Figure-Eight Flapping Motion of an Insect on Aerodynamics under Low Reynolds Number Conditions

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