Search Results 1-20 of 343

  • Resolvent analysis of turbulent channel flow with manipulated mean velocity profile

    UEKUSA Riko , KAWAGOE Aika , NABAE Yusuke , FUKAGATA Koji

    … <p>Using the resolvent analysis, we investigate how the near-wall mode primarily responsible for the friction drag is amplified or suppressed depending on the shape of the mean velocity profile of a turbulent channel flow. …

    Journal of Fluid Science and Technology 15(3), JFST0014-JFST0014, 2020

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  • Aerodynamic drag change of simplified automobile models influenced by a passing vehicle

    SHIMIZU Keigo , NAKASHIMA Takuji , HIRAOKA Takenori , NAKAMURA Yusuke , NOUZAWA Takahide , DOI Yasuaki

    … <p>On-road turbulence caused by atmospheric winds and other automobiles influences the flow field of automobiles and causes variations in aerodynamic forces. … Therefore, designing flow control techniques considering this impact will effectively improve the robustness of automobiles under on-road conditions. … In this study, we investigated flow phenomena responsible for drag changes under passing vehicle conditions to reduce drag. …

    Mechanical Engineering Journal 7(1), 19-00366-19-00366, 2020

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  • Fabrication of a Novel Culture Dish Adapter with a Small Recess Structure for Flow Control in a Closed Environment

    Yasuda Reiko , Adachi Shungo , Okonogi Atsuhito , Anzai Youhei , Kamiyama Tadataka , Katano Keiji , Hoshi Nobuhiko , Natsume Tohru , Mogi Katsuo

    … However, these methods are hampered by incompatibility with commercially available circular culture dishes and the difficulty in controlling liquid flow. … Here, we fabricated a culture dish adapter using polydimethylsiloxane that has a small recess structure for flow control compatible with commercially available culture dishes. …

    Applied Sciences 9(2), 269, 2019-01-14

    IR 

  • Vortex Structure Formed by a Sweeping Jet in Cross Flow  [in Japanese]

    HIRAO Takuya , FUCHIWAKI Masaki

    … <p>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. …

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

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  • Influence of Change in Turbulence Intensity on Suppression of Separated flow by DBD Plasma Actuator on a NACA0012 Airfoil  [in Japanese]

    KANEDA Takayuki , OHTAKE Tomohisa

    … <p>We investigated influence of change in residual turbulence intensity on suppression of separated flow by using DBD plasma actuator. … Flow field around a NACA0012 airfoil was visualized by smoke wire method at <i>Re</i> … We compared the flow field on the airfoil at changed residual turbulence intensity with the flow field on the airfoil at unchanged residual turbulence intensity. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), S05211, 2019

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  • Evaluation of Flow Control Valve using Particle Excitation for High Pressure Artificial Muscle  [in Japanese]

    YAMAMOTO Hikaru , NABAE Hiroyuki , HASHIMOTO Kou , KANDA Takefumi , WAKIMOTO Shuichi , SENO Norihisa , MORISHIGE Yoshihisa , TAKAMI Haruto , SUZUMORI Koichi , UKIDA Takahiro

    … <p>Many fluidic control components are required for the multiple-degree-of-freedom mechanisms of a robot using hydraulic actuators. … As a result, the volume of fluidic control system tends to increase. … Therefore, the compact and lightweight fluidic control components are required. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 2P1-E09, 2019

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  • Development of Proportional Control Valve using Particle Excitation:-Air pressure change experiment for conformation of valve open condition-  [in Japanese]

    HIROOKA Daisuke , FURUSHIRO Naomichi , YAMAGUCHI Tomomi

    … <p>In general, high controllability and high response control devices for pneumatic systems are demanded. … We have designed the flow control valve that can control flow proportionally with high response. … This flow control valve has simple structure using PZT vibration. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 1P1-K08, 2019

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  • Effect of orifice depth on vortex ring structure generated by a synthetic jet  [in Japanese]

    NOUMI Yuhei , YAMASHITA Yuya , HASEGAWA Hiroaki

    … <p>Synthetic jets are produced by periodic ejection and suction of fluid from an orifice induced by movement of a diaphragm inside a cavity, and a synthetic jet actuator is a useful tool for active flow control. … The synthetic jet actuator is considered as a promising candidate for flow control applications because of its compact nature and ability to generate momentum without the need for fluidic plumbing. …

    The Proceedings of Conference of Kanto Branch 2019.25(0), 19B05, 2019

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  • Development of Engineering Model Providing Body Force Distribution of Tri-Electrode Plasma Actuator

    NAKAI Kumi , NISHIDA Hiroyuki , ASAUMI Norio , TANAKA Yuhi , MATSUNO Takashi

    … Finally, the flow fields numerically obtained using the model developed are compared with the experimental results from our previous study. … Although there are some discrepancies mainly due to the two-dimensional laminar flow simulation, the model developed can quantitatively reproduce the voltage characteristics of thrust force and the jet structure induced. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 62(5), 247-255, 2019

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  • Study on energy regeneration mechanism of switching inertance hydraulic system by using modal analysis  [in Japanese]

    MAEKAWA Satoshi , INOUE Yoshio , SONOBE Motomichi , SUGANO Naoki

    … <p>The energy efficiency of the conventional flow control of hydraulic systems using the pressure loss of throttle valves, which are widely used in construction machinery, is very low. … If the switching inertance hydraulic system which is a kind of PWM control hydraulic system is used, a significant improvement in energy regeneration efficiency can be expected. …

    Transactions of the JSME (in Japanese) 85(875), 18-00355-18-00355, 2019

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  • Numerical study of flow past a transversely oscillating wavy cylinder at Re=5000

    Zhang Kai , Katsuchi Hiroshi , Zhou Dai , Yamada Hitoshi , Bao Yan , Han Zhaolong , Zhu Hongbo

    … In order to shed some light upon the mechanism for the free vibrations of the wavy cylinder reported previously (Zhang et al., 2017), we numerically investigate the effect of external forcing on the flow around a wavy cylinder at . … The cessation of the flow control efficacy in the forced vibration is explained by the recession of the mean streamwise vorticity contours. …

    Ocean Engineering (169), 539-550, 2018-12-01

    IR 

  • Onion-like networks are both robust and resilient

    Hayashi Yukio , Uchiyama Naoya

    … Tolerant connectivity and flow transmission within capacity are crucial functions as network. … We propose a new method by enhancing loops in the incremental growth for constructing onion-like networks with positive degree-degree correlations, whose topological structure has the optimal tolerance of connectivity against attacks in the state-of-the-art. …

    Scientific Reports (8), Article number: 11241, 2018-07-26

    IR 

  • Visualization of vortex ring structure in a synthetic jet  [in Japanese]

    NOUMI Yuhei , HASEGAWA Hiroaki

    … <p>A synthetic jet device is a useful tool for active flow control. … The vortex ring released from the synthetic jet traverses boundary layer at self-induced velocity and gives momentum in the flow. … Therefore, a synthetic jet is expected as a new method of boundary layer control. …

    The Proceedings of the Fluids engineering conference 2018(0), OS5-25, 2018

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  • Aerodynamic drag reduction by controlling flow structure of simplified vehicle model using plasma actuator  [in Japanese]

    SHIMIZU Keigo , NAKASHIMA Takuji , SEKIMOTO Satoshi , FUJII Kozo , HIRAOKA Takenori , NAKAMURA Yusuke , NOUZAWA Takahide

    … <p>In recent years, a dielectric barrier discharge plasma actuator (DBD-PA) which is a fluid control device, has been investigated for achieving both aerodynamic functionality and design shape in transportation equipment. … In this study, we installed a DBD-PA to a bluff body that reproduced the characteristic flow structures of a sedan-type automobile in order to reduce the aerodynamic drag. …

    The Proceedings of the Fluids engineering conference 2018(0), OS1-11, 2018

    J-STAGE 

  • Effect of Induced Flow by DBD Plasma Actuator on Separated Shear Layer near Leading Edge of a NACA0012 Airfoil  [in Japanese]

    HOJO Fumiya , OHTAKE Tomohisa

    … <p>In order to investigate influence of induced flow by DBD plasma actuator on separated shear layer near separation position, we focused on flow field near leading edge of NACA0012 airfoil including the separation position. … We carried out flow visualization tests on the airfoil at Reynolds number of 30,000. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), S0520302, 2018

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  • Control of Two-dimensional Offset Jet using Burst Modulation with a DBD Plasma Actuator  [in Japanese]

    SASAKI Shu , TOYODA Kuniaki , HONAMI Shinji , SANO Masatoshi

    … <p>An experimental study is performed on a two–dimensional offset jet with a dielectric barrier discharge plasma actuator (PA) as a flow control device that introduces a periodic disturbance to the system. … The offset jet is produced by a flow of air emitted from the end of a long parallel channel, and the plasma actuator is installed on the lower wall of the jet exit, and is operated using burst-modulated or continuous waveforms. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), S0520206, 2018

    J-STAGE 

  • Flow Characteristics of a Rectangular Jet with Tabs  [in Japanese]

    OUCHI Riku , KIWATA Takahiro , KONO Takaaki , YAMAOKA Jun

    … <p>Flow characteristics of a rectangular jet with tabs have been experimentally investigated using the flow visualization using oil mist, two-component hotwire anemometry and thermocouples. … Delta tabs were installed at a rectangular nozzle exit due to the passive control of a rectangular jet with an aspect ratio of 2.2. …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), S0510302, 2018

    J-STAGE 

  • Control of two-dimensional offset jet using burst modulation with a plasma actuator  [in Japanese]

    SASAKI Shu , SANO Masatoshi , TOYODA Kuniaki , HONAMI Shinji

    … <p>An experimental study is performed on a two-dimensional offset jet with a dielectric barrier discharge plasma actuator (PA) as a flow control device that introduces a periodic disturbance to the system. … The offset jet is produced by a flow of air emitted from the end of a long parallel channel, and the offset ratio <i>H</i>/<i>h</i> …

    Transactions of the JSME (in Japanese) 84(867), 18-00310-18-00310, 2018

    J-STAGE 

  • Computational Study of Body Force Production Process and Performance Improvement in Dielectric-Barrier-Discharge Plasma Actuator

    SATO Shintaro , TAKAHASHI Masayuki , OHNISHI Naofumi

    … <p>The discharge process in a dielectric-barrier-discharge (DBD) plasma actuator was numerically investigated in order to understand the EHD force production process and seek the key factors to enhance the performance for flow control applications. … These differences will also affect on the induced-flow structure and the control performance of the DBD plasma actuator.</p> …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 16(6), 550-555, 2018

    J-STAGE 

  • Development of a Micro-Manipulator for Bio-Targets Using Micro Flows

    Pelletier Jean-Charles , Aoyama Hisayuki , Irie Yuuka , Kanamori Chisato , Piat Nadine

    … The manipulation principle and system structure are presented. … In addition, a simple model that uses physically observable parameters is constructed to capture the flow-target interactions following a chemically assisted flow visualization. …

    Journal of Robotics and Mechatronics 30(4), 638-649, 2018

    J-STAGE 

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