Faculty Profiles - FUCHIWAKI Masaki

Papers - FUCHIWAKI Masaki

Division display21 - 40 of about 237／ All the affair displays >>

Pressure drop mechanisms generated in a cooling system enclosure of construction machinery Reviewed International journal

Kawano T., Fuchiwaki M.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM 2 2021.01

Modelling and reducing fuel flow pulsation of a fuel-metering system by improving response of the pressure control valve during pump mode switching in a turbofan engine Reviewed

Masuda S., Shimizu F., Fuchiwaki M., Tanaka K.

ASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019 2020.01

Vorticity Growth Formed by an Elastic Deformation of Moving Airfoil

TONE Chigusa, FUCHIWAKI Masaki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) OS03-07 2020.01

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

In recent years, there has been increasing interest in the flow field around elastic airfoils that perform unsteady motion, and many studies have been conducted using experimental and numerical approaches. There are many reports on the relationship between the wake structure of the unsteady airfoils and the dynamic fluid force acting on them. On the other hand, the dynamic behaviors of micro vortex structure and the growth process of the vortex structure have not been clarified sufficiently. The purpose of our present study is to clarify the growth process of the vortex structure in the vicinity of the wall. Especially, the authors focus on the movement of the wall and defined the as the temporal change in the spatial gradient in order to evaluate the elastic deformation quantitatively. The authors perform the numerical simulation of the flow field around a heaving elastic airfoil by using ANSYS CFX 17.0 and investigate the dynamic behaviors of the vorticity in vicinity of the wall.

DOI： 10.1299/jsmefed.2020.os03-07

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2020/0/2020_OS03-07/_pdf

Soft Actuator based on Bimorph Conducting Polymer with Differnet Thickness ratio

HAYASHI Mizuki, HUH Jong-Hoon, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) J11119 2020.01

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

Soft actuators, or artificial muscles, based on conducting polymers, constitute the base for the development of promising polymeric sensing motors, tools for surgeons, or zoomorphic and anthropomorphic soft robots. Some electrochemical characterizations of these soft actuators of artificial muscles have been already reported. In this study, the behaviors of the asymmetric bilayer artificial muscles, PPy-ClO4/PPy-DBS worked in 0.5 M NaClO4 aqueous solutions were discussed by the dynamo-voltammetric responses and coulo-dynamic Evolution responses. Especially, the authors are focusing on the thickness ratio between the PPy-ClO4 and the PPy-DBS layers in this study. In this study, the author investigates the dynamic behavior of the bending actuation of the asymmetric bilayer artificial muscles based on some kinds of the thickness ratio between the anion-driven and the cation-driven layers.

DOI： 10.1299/jsmemecj.2020.j11119

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2020/0/2020_J11119/_pdf

Vorticity Growth Formed by a Translation of wall on a Moving Elastic Airfoil

TONE Chigusa, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) S05121 2020.01

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

Flow field around moving airfoils capable of flexible elastic deformation has become a focus of attention in recent years. These flow fields 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. Many studies on the flow field and the characteristics of dynamic forces acting on them around the elastic moving body have also carried out by the experimental and numerical approaches. The macro scale vortex structure and the characteristics of dynamic forces acting on the elastic moving airfoil have been understood. However, the details of the vortex structure and the growth process of the vorticity in a vicinity of the wall of an elastic airfoil has not been clarified sufficiently. In this study, the authors investigate the growth process of the vorticity in a vicinity of the wall of an elastic airfoil by FSI simulation using ANSYS 17.0/ANSYS CFX 17.0. In order to clarify the parameters which contributes to the growth process of the vorticity, the flow fields in the vicinity of the wall of the elastic and the rigid airfoils are visualized.

DOI： 10.1299/jsmemecj.2020.s05121

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2020/0/2020_S05121/_pdf

Flow Structure formed by a Sweeping jet into Cross Flow

KOBAYASHI Eisei, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) S05106 2020.01

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

A fluidic oscillator generates a sweeping jet with high frequency and large amplitude and is characterized by its capability for jet ejection over a wide range and for fluid oscillation by an internal structure that eliminates the need for a drive unit. Recently, the sweeping jet from the fluidic oscillator has attracted attention as an active flow control device. Many studies on flow control techniques using the sweeping jet have been reported. However, the details of the flow structure produced by the interaction between the sweeping jet and the main flow are not yet understood sufficiently. In particular, the vortex structure or the flow mechanism produced by the interaction between the sweeping jet has not been clarified. The purpose of the present study is to clarify the macro-scale vortex structure produced by the interaction between the sweeping jet from the fluidic oscillator and the main flow. The detailed vortex structure produced by these interactions is visualized quantitatively by a numerical simulation.

DOI： 10.1299/jsmemecj.2020.s05106

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2020/0/2020_S05106/_pdf

Vortex Flow Structure Generated by Sweeping Jet in Cross Flow

KOBAYASHI Eisei, FUCHIWAKI Masaki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2020 ( 0 ) OS03-21 2020.01

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

A jet in cross flow is one of typical phenomena in fluid engineering and many studies about this flow field have been already reported. On the other hand, a sweeping jet produced by a fluidic oscillator has a high frequency and a large amplitude and is attracted attention from the viewpoint of an active flow control in recent years. However, the studies on sweeping jet in cross flow have not been understood sufficiently and the detailed flow structures and vortex structures have not clarified. The purpose of the present study is to clarify the detailed flow structures in the sweeping jet in cross flow by using a numerical simulation. Especially, the authors focus on the flow structures and its dynamic behaviors formed by an interaction between the sweeping jet and main flow near the outlet of the sweeping jet.

DOI： 10.1299/jsmefed.2020.os03-21

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2020/0/2020_OS03-21/_pdf

Vorticity Growth Process on a Wall of an Elastic Moving Airfoil Reviewed International journal

2019.09

Optimization of Thickness Ratio of Asymmetric Bilayer Artificial Muscle Reviewed

2019.08

Flow Structure Generated by a Sweeping Jet in a Cross Flow Reviewed

2019.05

Modelling and reducing fuel flow pulsation of a fuel-metering system during pump mode switching in a turbofan engine Reviewed

Masuda S., Shimizu F., Fuchiwaki M., Tanaka K.

IOP Conference Series: Earth and Environmental Science 240 ( 5 ) 2019.03

Vorticity Formed by an Elastic Deformation of a Moving airfoil and its Growth

TONE Chigusa, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) S05123P 2019.01

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

Previous studies have shown that the elastic airfoil with heaving motion generates a strong vorticity on the airfoil wall and emits a strong vorticity in the wake compared to the rigid airfoil. However, how spatial gradient and vorticity development are related has not been elucidated. This research investigates the relationship between the time change of the spatial gradient of the airfoil wall and the vorticity created on the moving airfoil wall. Specifically, using NACA0010 with heaving motion with the strength of heaving motion St = 0.3, the heaving amplitude A = c/5, the attack angle α is 16 °, Re based on chord length is Re = 4,000. The airfoil has a non-dimensional distance from the leading edge x/c = 0 to 0.25 as a rigid part and x/c = 0.25 to 1.0 as an elastic part, and numerical analysis by fluid-structure interaction analysis using ANSYS 17.0 / ANSYS-CFX 17.0. For the turbulence model, we use k-ω of RANS, which has a relatively small computational load. The fact that the non-dimensional vorticity vicinity the trailing edge of the airfoil is developing when the downward deformation is small and only near the trailing edge, not when the airfoil wall is largely deformed downward.

DOI： 10.1299/jsmemecj.2019.s05123p

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2019/0/2019_S05123P/_pdf

Growth Process of Vorticity Formed on a Moving Elastic Airfoil

TONE Chigusa, FUCHIWAKI Masaki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) OS3-45 2019.01

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

The flow field around moving airfoil capable of flexible elastic deformation has become a focus of attention in recent years. These flow fields 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. Many studies on the flow filed around the elastic moving body have also carried out. The macro scale vortex structure and the dynamic forces acting on the elastic moving airfoil have been understood. However, the growth process of the vorticity in a vicinity of the wall of an elastic airfoil has not been clarified sufficiently. In this study, the authors investigate the growth process of the vorticity in a vicinity of the wall of an elastic airfoil by FSI simulation using ANSYS 17.0 / ANSYS CFX 17.0. Especially, the authors focus on the relationship between the spatial gradient of the wall of the elastic airfoils and the growth process of the vorticity in a vicinity of the wall.

DOI： 10.1299/jsmefed.2019.os3-45

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2019/0/2019_OS3-45/_pdf

Vortex Structure Formed by a Sweeping Jet in Cross Flow

HIRAO Takuya, FUCHIWAKI Masaki

The Proceedings of Mechanical Engineering Congress, Japan ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) S05122P 2019.01

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

The fluidic oscillator generates a sweeping jet with a high frequency and a large amplitude and is characterized by its capability for jet ejection over a wide range and for fluid oscillation by an internal structure. The sweeping jet from a fluidic oscillator has attracted attention as an active flow control device. Many studies on flow control techniques using a sweeping jet have been conducted. However, these studies focused on the characteristics of the dynamic forces acting on an airfoil in conjunction with a fluidic oscillator. The purpose of the present study is to investigate the detailed vortex structure generated by the interaction between the sweeping jet from the fluidic oscillator and the main flow. The detailed vortex structure produced by these interactions is visualized quantitatively by a stereo PIV measurement. The detailed vortex structure and the flow mechanism generated by these interactions are investigated.

DOI： 10.1299/jsmemecj.2019.s05122p

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmemecj/2019/0/2019_S05122P/_pdf

Flow Structure Formed by an Interaction between a Sweepimg Jet and a Cross Flow

HIRAO Takuya, FUCHIWAKI Masaki

The Proceedings of the Fluids engineering conference ( The Japan Society of Mechanical Engineers ) 2019 ( 0 ) OS3-46 2019.01

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

The sweeping jet from a fluidic oscillator has attracted attention as an active flow control device. Many studies on flow control techniques using a sweeping jet have been conducted. However, interaction between the sweeping jet and the main flow is expected to occur, and a complex vortex structure will be generated. The authors have reported the flow characteristics generated by interactions between the sweeping jet from the fluidic oscillator and the main flow based on stereo particle image velocimetry (PIV) measurement. Finally, the sweeping jet from the fluidic oscillator spreads out over a wider range due to its interaction with the main flow. At the high-velocity rate, Vj/V0, the high-velocity jets at the center of the sweeping jet are surrounded by low-velocity jets with a strong rotational component at the outside. The purpose of the present study is to clarify the development process of the detailed vortex structure generated by the interaction between the sweeping jet from the fluidic oscillator and the main flow.

DOI： 10.1299/jsmefed.2019.os3-46

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmefed/2019/0/2019_OS3-46/_pdf

Growth of Vortcity in a Vicinity of Wall of an Elastic Moving Airfoil Reviewed

2018.12

Breakup of Bubble Cloud Ejected into a Main Flow Reviewed

2018.10

Flow structure formed by a sweeping jet ejected into a main flow Reviewed

2018.07

Dynamic Behavior of Leading Edge vortex and Vorticity on Suction Surface of a Heaving Elastic Airfoil Reviewed

2018.06

Flow structure formed by a sweeping jet ejected into a main flow Reviewed

Fuchiwaki M., Raghu S.

American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM 1 2018.01

　 PREV - NEXT 　

<FUCHIWAKI Masaki>

Papers - FUCHIWAKI Masaki