Faculty Profiles - FUCHIWAKI Masaki

Papers - FUCHIWAKI Masaki

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Characteristics of Dynamic Forces generated by a Butterfly wing

KONDO Susumu, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2018 ( 0 ) J0210203 2018.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

A typical example of the flow field around a moving elastic body is that around butterfly wings, which contain many veins and can undergo elastic deformation. In recent years, quantitative flow visualization techniques, such as Particle Image Velocimetry (PIV) measurement, have advanced rapidly, and the flow fields around insect wings have been actively investigated using such techniques. The characteristics of the dynamic forces generated by the flapping insect wing have attracted a great deal of attention. However, the characteristics of dynamic forces generated by the flapping insect wing are not yet sufficiently understood. The purpose of the present study is to investigate the characteristics of dynamic lift generated by the flapping butterfly wing. We measured the dynamic lift produced by a flapping butterfly, using a six-axes sensor. The sixaxes sensor was synchronized with a high speed camera to capture the flapping motion of the wing, and the dynamic lift was related to the flapping motion of the butterfly wing.

DOI： 10.1299/jsmemecj.2018.j0210203

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2018/0/2018_J0210203/_pdf

Growth of Vorticity on a Wall of a Elastic Moving Airfoil

SHIGENOBU Itsuki, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2018 ( 0 ) S0510102 2018.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

The flow field around a moving airfoil is one of the typical unsteady flow and many studies on the flow field around the moving airfoil have been carried out with experimental and numerical approaches. Especially, not only the dynamic behavior of the leading edge vortex and wake structure of moving airfoils, but also their dynamic lift and thrust characteristics have been already reported. In recent years, the flow field around an elastic moving body has been attracted attention. The flow field around the elastic body is treated as a coupled problem between the fluid and structure (fluid structure interaction, FSI), and a series of phenomena, motions, structural deformations and the generation/growth/development of vortices are reported continuously. Many studies on the flow field around the elastic moving body have also carried out. However, the impact of elastic deformation effects on the vortices generated in the vicinity of the wall and the dynamic behaviors of the micro scale vortices have not been clarified sufficiently. The objective of this study is to investigate the dynamic behaviors of the vorticity in the vicinity of the wall of the heaving elastic airfoil by FSI simulation using ANSYS 17.0/ANSYS CFX 17.0.

DOI： 10.1299/jsmemecj.2018.s0510102

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2018/0/2018_S0510102/_pdf

Dynamic Behavior of Bubble ejected into a main flow

IKEDA Takuji, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2018 ( 0 ) S0530305 2018.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

The gas-liquid two-phase flow is a flow in which gas and liquid are mixed, and in particular, the behavior of the gas-liquid interface is a complicated flow field with strong three-dimensional and extremely non-stationarity, it is considered difficult to understanding. In this study, we focused on clarifying the dynamic behavior of gas and the mechanism of bubbles breakup in the cross flow in which another fluid is blown into the main flow and revealed them. Concretely, we caught the three-dimensional dynamic behavior of the gas-liquid interface by VOF method using ANSYS CFX 17.2. As the results, at the gas-liquid interface of the bubble cloud, there are waves propagating from the cylinder to the rear end of the bubble cloud. These waves are formed by iso-surfaces of the pressure which stretches in a tubular shape and these periodically occur from the wall surface of cylinder.

DOI： 10.1299/jsmemecj.2018.s0530305

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2018/0/2018_S0530305/_pdf

Breakup process of a bubble cloud ejected into a main flow

IKEDA Takuji, FUCHIWAKI Masaki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2018 ( 0 ) OS2-19 2018.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

Many studies on the dynamic behaviors of bubble in the jet in cross flow have been already reported in both experimental and numerical approaches. However, the break-up mechanism has not been understood. The authors are trying to understand the break-up mechanism from the bubble cloud to small bubbles. In this study, the authors tried to clarify the break-up process from the bubble cloud in the jet in cross flow to small bubbles using by VOF method using ANSYS CFX 17.2. The waves on the surface of the bubble cloud synchronized with the karman vortex street. Moreover, the break-up of the bubble from the bubble cloud also synchronized with the dynamic behavior of the karman vortex. Based on these results, it is predicted that the dynamic behavior of the karman vortex rolled up from the cylinder contributes to the break-up of the bubble from the bubble cloud.

DOI： 10.1299/jsmefed.2018.os2-19

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2018/0/2018_OS2-19/_pdf

Dynamic Behavior of Vortices Rolled up from a Heaving Elastic Airfoil by a FSI simulation Reviewed

Masaki Fuchiwaki, Kazuhiro Tanaka

Proc. of the 8th TSME International Conference on Mechanical Engineering 2017.12

Dynamic Forces Generated by a Flapping Butterfly Wing in a Fixed Condition Reviewed

2017.10

Flow structure formed by an interaction between a Jet Flow from a Fluidic Oscillator and a Main Flow Reviewed

Masaki Fuchiwaki, Surya Raghu

Proc. of the International Conference on Jets, Wakes and Separated Flows 2017.10

Characteristics of Dynamic Forces Generated by a Flapping Butterfly and Its Wake Structure Reviewed

2017.07

Cooperative Actuation of Asymmetric Bilayer Muscles based on Polypyrrole Reviewed

2017.06

Characteristics of dynamic forces generated by a flapping butterfly and its wake structure Reviewed International journal

Fuchiwaki M., Tanaka K.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM 1C-2017 2017.01

Elastic Deformation on Trailing edge of a Heaving Elastic Airfoil in a Separation Region and Its Dynamic Lift

IKEDA Takuji, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2017 ( 0 ) S0520501 2017.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

The flow field around an unsteady airfoil is a common type of unsteady flow, and many researchers have experimentally and numerically investigated unsteady flows around moving airfoils. In recent years, the flow field around moving airfoils capable of flexible elastic deformation has become a focus of attention. The flow field around an elastically deforming airfoil may be understood as a fluid-structure interaction (FSI) problem, and the motion and deformation of elastic airfoils, as well as the associated dynamic behavior of the vortices, are complicated. In this study, the dynamic behavior of the vortices rolled up from the leading edge of a heaving elastic airfoil in a separation region through FSI simulation using ANSYS 16.1/ANSYS CFX 16.1. In particular, the FSI simulation of the flow field on a heaving elastic airfoil at an angle of attack of 16°, which is in the separation region under stationary conditions, and the dynamic behavior of both the leading edge vortex and the vorticity in the vicinity of the suction surface were clarified.

DOI： 10.1299/jsmemecj.2017.s0520501

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2017/0/2017_S0520501/_pdf

Vortex Structure around a Heaving Elastic Airfoil in Separation Region Reviewed

2016.12

Vortex Ring Developed in Wake of a Flapping Butterfly Wing and Its Contribution to Dynamic Lift Reviewed

Proc. of the 7th International Conference on Vortex Flows and Vortex Models 2016.09

Dynamic Behaviors of Vortex Ring Rolled up by a Butterfly Wing and Its Dynamic Lift Reviewed

2016.07

Asymmetric Bilayer Artificial Muscles based on Polypyrrole Invited Reviewed

Proc. of the 5th International Conference Smart and Multifunctional Materials Structures & Systems 2016.06

Vortex rings formed behind a free-flight butterfly and their dynamic behaviors Reviewed

185 547 - 553 2016.01

Dynamic behaviors of vortex ring rolled up by a butterfly wing and its dynamic lift Reviewed

1A-2016 2016.01

Vortex structure in wake of an elastic heaving airfoil covered with wall.

Rahman Shahana, Fuchiwaki Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2016 ( 0 ) S0520305 2016.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

We investigate the dynamic behavior of the vortices rolled up from the trailing edge of the heaving elastic airfoil, the wake structure and the accelerating flow in the wake by a Fluid Structure Interaction simulation using ANSYS CFX 16.0 / ANSYS 16.0. The vortices rolled up from the trailing edge of the heaving elastic airfoil covered with wall are interfered with wall strongly and the vorticity in the wake are kept high compared with that without wall. As a result, the thrust producing vortex street is formed clearly in the wake of the heaving elastic airfoil with wall and their vorticities are also kept high. Moreover, the clear accelerating flow is formed in the wake of the heaving elastic airfoil with wall and it becomes large even behind eight chord length due to the interaction between vortices and wall.

DOI： 10.1299/jsmemecj.2016.s0520305

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2016/0/2016_S0520305/_pdf

Dynamic Behavior of Vortices Rolled up from an Elastic Heaving Airfoil in Separation Region

FUCHIWAKI Masaki, Tanaka Kazuhiro

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2016 ( 0 ) 0214 2016.01

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)

Many researchers have experimentally and numerically investigated the flow field around an unsteady airfoil, which is a common unsteady flow. In particular, there have been a number of studies on the flow field around a pitching airfoil, a heaving airfoil and a combination airfoil with combined pitching and heaving motions. In recent years, the flow field in the vicinity of moving airfoils capable of flexible elastic deformation has become a focus of attention. Flow in the vicinity of an elastically deforming airfoil may be understood as a fluid-structure interaction (FSI) problem, and the motion and deformation of elastic airfoils, as well as the associated vortex flow phenomena in their vicinity, are complicated. In this study, we investigate the dynamic behavior of vortices on elastic heaving airfoil in a separation region, at 16 degree of attack angle, by fluid structure interaction simulation using ANSYS 16.1/ANSYS CFX 16.1.

DOI： 10.1299/jsmefed.2016.0214

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2016/0/2016_0214/_pdf

Characteristics of Dynamic Forces acting on Elastic Heaving Airfoil in a Separation Region Reviewed

2015.12

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Papers - FUCHIWAKI Masaki