Updated on 2026/03/11

写真a

 
YAMAGATA Takayuki
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Associate Professor
Faculty of Engineering Department of Engineering Associate Professor
Title
Associate Professor
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Degree

  • Ph. D (Engineering) ( 2009.3   Tohoku University )

Research Interests

  • Visualization

  • 混合

  • 安全工学

  • 数値流体力学

  • Aeroacoustics

  • PIV

  • Pipe-Wall Thinning

  • Mass Transfer

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  • Informatics / Robotics and intelligent system

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Safety engineering

  • Informatics / Mechanics and mechatronics

Research History (researchmap)

  • Niigata University   Faculty of Engineering, Department of Engineering   Associate Professor

    2021.6

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  • Niigata University   Graduate School of Science and Technology Specialized Course of Advanced Materials Science and Technology   Associate Professor

    2021.6

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  • Niigata University   Faculty of Engineering, Department of Engineering   Assistant Professor

    2017.4 - 2021.5

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  • Niigata University   Production Engineering Manufacturing System   Assistant Professor

    2013.10 - 2017.3

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  • Niigata University   Faculty of Engineering   Assistant Professor

    2009.4 - 2013.9

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Assistant Professor

    2009.4 - 2013.9

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Research History

  • Niigata University   Advanced Materials Science and Technology, Graduate School of Science and Technology   Associate Professor

    2021.6

  • Niigata University   Department of Engineering, Faculty of Engineering   Associate Professor

    2021.6

  • Niigata University   Institute of Science and Technology, Academic Assembly   Associate Professor

    2021.6

  • Niigata University   Faculty of Engineering Department of Engineering   Assistant Professor

    2017.4 - 2021.5

  • Niigata University   Abolition organization Manufacturing System   Assistant Professor

    2013.10 - 2017.3

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Assistant Professor

    2009.4 - 2013.9

  • Niigata University   Faculty of Engineering   Assistant Professor

    2009.4 - 2013.9

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Education

  • Tohoku University   Graduate School of Engineering   Department of Bioengineering and Robotics

    - 2009.3

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  • Tohoku University   Faculty of Engineering   機械電子工学科

    - 2004.3

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Professional Memberships

  • Japan Society of Maintenology

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  • THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS

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  • THE VISUALIZATION SOCIETY OF JAPAN

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  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

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Committee Memberships

  • 可視化情報学会   代議員  

    2013.6 - 2015.5   

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    Committee type:Academic society

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  • 日本機械学会北陸信越支部   商議員  

    2013.3 - 2015.2   

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    Committee type:Academic society

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Papers

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MISC

  • Numerical Simulation on Performance of a Cross-Flow Water Turbine

    WANG Tianbo, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2018 ( 0 )   2018

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  • Measurement of Flow Field and Visualization of Sound Source Distribution Around a D-Shaped Body

    NAKATA Yosuke, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2018 ( 0 )   2018

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  • Measurements of velocity fields in 90° elbow and the effect of radius ratio

    IKARASHI Yuya, TAGUCHI Shoichi, UNO Taku, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2018 ( 0 )   2018

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  • 1501 Inflow Phenomenon in Near Field of Horizontal Pipe Exit by Density Gradient of Fluids

    KANEKO Yoshiki, FUJISAWA Nobuyuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2016 ( 0 )   _1501 - 1_-_1501-3_   2016

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  • 1502 Characteristics of Liquid Film behind an Orifice in Annular Two-phase Flow Conditions

    TSURUTA Hidefumi, NISHII Yuhei, FUJISAWA Nobuyuki, YAMAGATA Takayuki, INADA Fumio

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2016 ( 0 )   _1502 - 1_-_1502-3_   2016

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  • 1514 Influence of Equivalence Ratio and Co-flow Velocity on Fluctuating Property of Flickering Frame

    OKUDA Takeyuki, FUJISAWA Nobuyuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2016 ( 0 )   _1514 - 1_-_1514-3_   2016

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  • 402 キャビテーションジェットのシャドウグラフイメージングと圧力パルスの同時計測

    柳澤 慧太, 渡部 龍太, 山縣 貴幸, 藤澤 延行

    山梨講演会講演論文集   2015 ( 0 )   92 - 93   2015

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  • 403 Evaluation of Mass and Momentum Transfer Inside and Downstream of Elbow

    IKARASHI Yuya, TAGUCHI Syouichi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2015 ( 0 )   94 - 95   2015

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  • A213 Non-axisymmetrical mass transfer phenomenon behind an orifice in a pipe combined with curved swirling flow

    TAKANO Tsuyoshi, UTIYAMA Kazuya, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of the National Symposium on Power and Energy Systems   2014 ( 0 )   193 - 194   2014

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    The influence of the swirling intensity on non-axisymmetric mass transfer rate behind the orifice in a curved swirling flow is investigated experimentally. The experimental results indicate that the high mass transfer rate is observed on one side of the pipe behind the orifice in a strong swirling flow, although the mass transfer rate keeps almost axisymmetric distribution in a weak swirling flow.

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  • 0606 Experimental study on liquid droplet impingement erosion

    FUJISAWA Nobuyuki, WADA Keitaro, YAMAGATA Takayuki

    The Proceedings of the Fluids engineering conference   2014 ( 0 )   _0606 - 1_-_0606-2_   2014

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    This paper presents an experimental study on the liquid droplet impingent erosion of aluminum material using the high-speed spray jet. The flow configuration studied is the pin-hole type erosion, which has the erosion depth comparatively larger than the spray width. The experimental result shows that the growth rate of the erosion is decreased with an increase in the erosion depth due to the influence of liquid film and their relationship is formulated.

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  • 504 Measurement of Mass Transfer Coefficient in a Pipe by Calcium-sulfate Dissolution Method

    UCHIYAMA Kazuya, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2014 ( 0 )   121 - 122   2014

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  • 505 Stereo PIV Measurement of Swirling Flow behind an Orifice in a Circular Pipe with an Elbow

    IKARASHI Yuya, TAKANO Tuyoshi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2014 ( 0 )   123 - 124   2014

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  • 506 Study on Aerodynamic Noise and Unsteady Fluid Force in Semi-circular Object

    SAITO Nozomi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2014 ( 0 )   125 - 126   2014

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  • 306 Numerical Analysis of Flow and Mass Transfer behind an Orifice in Curved Swirling Flow

    ISHIZUKA Ai, KANATANI Nobuaki, TAKANO Tsuyoshi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _306 - 1_-_306-2_   2014

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  • 307 Influence of Swirl Intensity on Flow and Mass Transfer behind an Orifice in Curved Swirling Flow

    KANATANI Nobuaki, TAKANO Tsuyoshi, YAMAGATA Takayuki, NISHIMIYA Shou, UTIYAMA Kazuya, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _307 - 1_-_307-2_   2014

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  • 310 Development of Pipe-Wall-Thinning Prediction by Liquid Droplet Impingement Erosion Considering Influence of Liquid Film

    Wada Keitaro, Saito Kengo, Yamagata Takayuki, Fujisawa Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _310 - 1_-_310-2_   2014

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  • 302 Influence of Co-flow on Flickering Characteristics of Premixed Methane/Air Flame

    TOMIDOKORO Hirofumi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _302 - 1_-_302-2_   2014

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  • 303 POD Analysis of a Buoyant Jet at Low Froude Number

    WATANABE Ryuta, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _303 - 1_-_303-2_   2014

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  • 304 Visualization and POD Analysis of Flickering Premixed Flame by Flame Reaction Technique

    YAMADA Jumpei, MATSUMOTO Yohei, FUJISAWA Nobuyuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _304 - 1_-_304-2_   2014

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  • 312 Measurement of Unsteady Fluid Forces and Aerodynamic Sound for a Semi-circular Cylinder

    KULAKIT Sangjan, OGUMA Yasuyuki, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _312 - 1_-_312-2_   2014

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  • 313 Experimental Study on Aerodynamic Sound and Flow Structure around a Semi-Circular Cylinder

    OGUMA Yasuyuki, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _313 - 1_-_313-2_   2014

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  • 1509 A Consideration of Schmidt Number in Flow Accelerated Corrosion

    KANAZAWA Tomoyuki, ITO Akihiro, YAMAGATA Takayuki, FUJISAWA Nobuyuki, FUJIWARA Kazutoshi, INADA Fumio

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2013 ( 0 )   150901 - 150902   2013

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  • 1501 Study on control of flame flickering by co-flow

    Tomidokoro Hirofumi, Abe Takao, Yamagata Takayuki, Fujisawa Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2013 ( 0 )   150101 - 150102   2013

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  • 1503 Three-dimensional velocity-field measurement of inflow phenomenon in buoyant jet at low Froude number

    MAEDA Atsushi, ISHIZUKA Ai, WATANABE Ryuta, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2013 ( 0 )   150301 - 150302   2013

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  • 203 Experimental study on aerodynamic sound and flow field structure around a semi-circular cylinder

    OGUMA Yasuyuki, KULAKIT Sangjan, SAITO Nozomi, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2013 ( 0 )   34 - 35   2013

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  • 256 Study on Flow Structure of Buoyant Jet at Low Froude Number by Proper Orthogonal Decomposition

    WATANABE Ryuta, GOUNO Tatsuya, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2013 ( 0 )   58 - 59   2013

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  • 603 Development of Pipe-Wall-Thinning Prediction by Liquid Droplet Impingement Erosion Considering Influence of Liquid Film

    Wada Keitaro, Saito Kengo, Yamagata Takayuki, Fujisawa Nobuyuki

    The Proceedings of Yamanashi District Conference   2013 ( 0 )   156 - 157   2013

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  • 606 Axi-asymmetric Mass Transfer Phenomenon behind an Orifice in a Curved Swirling Flow

    Takano Tsuyoshi, Yamagata Takayuki, Sato Yuki, Fjiisawa Nobuyuki

    Yamanashi district conference   2012   158 - 159   2012.10

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  • 時系列スキャニングステレオPIVによる低フルード数浮力噴流の三次元速度場計測(受賞論文要約)

    郷野 達也, 首藤 智明, 山縣 貴幸, 藤澤 延行

    新潟大学工学部研究報告 = 新潟大学工学部研究報告   61 ( 61 )   1 - 1   2012.3

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  • 0504 Study on Pipe-Wall Thinning behind an Orifice by the Combined Influence of Curved Pipe and Swirling Flow

    KANNO Sho, YAMAGATA Takayuki, FUJISAWA Nobuyuki, TAKANO Tsuyoshi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   50401 - 50402   2012

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  • 0509 Measurement of fluid force around a freely oscillating cylinder based on PIV measurement

    MATSUI Toshifumi, YAMAGATA Takayuki, FUJISAWA Nobuyuki, NAGASAWA Takuya

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   50901 - 50902   2012

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  • 0510 Scanning LIF/PIV Study on Inflow in Near Field of Turbulent Buoyant Jet

    MAEDA Atsushi, FUJISAWA Nobuyuki, MURATA Kazuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   51001 - 51002   2012

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  • 0511 Simultaneous measurement of temperature and velocity in premixed flame by combined two-color method and PIV

    KANOOKA Takao, FUJISAWA Nobuyuki, TOMIDOKORO Hirohumi, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   51101 - 51102   2012

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  • 602 Numerical Simulation of Axi-asymmetric Pipe-wall Thinning behind an Orifice in Curved Swirling Flow

    IWATA Koushirou, YAMAGATA Takayuki, FUJISAWA Nobuyuki

    The Proceedings of Yamanashi District Conference   2012 ( 0 )   150 - 151   2012

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  • 603 Evaluation of Liquid Droplet Impingement Erosion by High-speed Spray and Proposal of Erosion Model

    Saito Kengo, Hayashi Kanto, Yamagata Takayuki, Fujisawa Nobuyuki

    The Proceedings of Yamanashi District Conference   2012 ( 0 )   152 - 153   2012

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  • 608 Development of non-intrusive flame temperature measurement by flame reaction technique

    Abe Takao, Tomidokoro Hirofumi, Yamagata Takayuki, Fjiisawa Nobuyuki

    The Proceedings of Yamanashi District Conference   2012 ( 0 )   162 - 163   2012

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  • F081003 Latest Technical Knowledge on the Pipe Wall Thinning Management : (3) Latest Study on the Liquid Droplet Impingement Erosion

    FUJISAWA Nobuyuki, MORITA Ryo, NAKAMURA Akira, YAMAGATA Takayuki

    The Proceedings of Mechanical Engineering Congress, Japan   2012 ( 0 )   _F081003 - 1-_F081003-3   2012

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    This paper describes the critical consideration on the past studies in literature related to the wall thinning rate of the metal materials due to the liquid droplet impingement erosion. It is found that the power index of droplet velocity on the wall thinning rate ranges from 6 to 8 for the water jet and spray tests, while that of the rotating disk test shows smaller power index 5.8 which is closer to the theoretical value 5. The difference in the power indices is expected due to the influence of liquid film over the test specimen.

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  • 305 Measurement of Three-dimensional Velocity Field of Buoyant Jet by Scanning Stereo PIV

    Syutoh Tomoaki, Fullsawa Nobuyuki, Gono Tatsuya, Yamagata Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2011 ( 0 )   81 - 82   2011

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  • 304 Fluid Force Measurement on a Circular Cylinder by PIV Measurement

    OKAMIYA Masayoshi, YAMAGATA Takayuki, MA「SUI Toshifumi, FUJISAWA Nobuyuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2011 ( 0 )   79 - 80   2011

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  • 912 Evaluation of Mass Transfer Coefficient Behind an Orifice with Allowable Orifice Bias in a Pipe Flow : Effect of Swirling Flow

    ITO Yoshito, YAMAGATA Takayuki, FUJISAWA Nobuyuki, TAKANO Tsuyoshi

    The Proceedings of Ibaraki District Conference   2010 ( 0 )   261 - 262   2010

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    In the present paper, the mass transfer phenomenon behind an orifice in a pipe flow is studied by measuring the mass transfer coefficient along the pipe wall using naphthalene sublimation method. An attention is placed on the asymmetrical pipe-wall thinning behind an orifice under the influence of swirling-flow intensity and allowable orifice bias. The present measurement indicates that the mass transfer coefficient becomes asymmetric about the pipe axis by the combined effect of swirling flow and allowable orifice bias. It is found that the enhancement of mass transfer coefficient is observed on the shorter side of the orifice plate and the reduction is found on the opposite side. This phenomenon is found to be consistent with the flow-field observation in the previous study.

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  • E143 Non-intrusive flame temperature measurement by flame reaction

    Nakagawa Yu, Ohkubo Masakazu, Fujisawa Nobuyuki, Yamagata Takayuki

    The Proceedings of the Thermal Engineering Conference   2010 ( 0 )   147 - 148   2010

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    In the present paper, an experimental technique for measuring flame temperature contour is proposed using the flame reaction. This method allows the temperature measurement by visualizing the flame by the luminescence of Na supplied to the form of mist. An example of temperature measurement is shown for the premixed flickering flame of methane and air. The results indicate the unsteady behavior of the temperature contour during the flickering motion.

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  • G222 Anomalous Inflow Condition of Buoyant Jet at Low Froude Number by Scanning LIF and Numerical Simulation

    Maeda Atsushi, Syuto Tomoaki, Yamagata Takayuki, Fujisawa Nobuyuki

    The Proceedings of the Thermal Engineering Conference   2010 ( 0 )   367 - 368   2010

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    Inflow phenomenon in near field of buoyant jet issuing into still surrounding of water is studied experimentally and numerically. The experimental visualization is carried out using 3D LIF technique, which visualizes the three-dimensional inflow phenomenon in the near field of buoyant jet. It is found from the experiment that the inflow phenomenon starts in the near field of buoyant jet when the Froude number becomes lower than the critical inflow condition. In order to understand the physics of inflow phenomenon, numerical simulation is carried out. The numerical result reproduces well the critical inflow condition observed by experiment. With further decrease in Froude and Reynolds numbers, the vigorous fluid mixing is found in the experiment, which is due to the appearance of turbulence in the jet caused by the inflow phenomenon.

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  • 1201 Study on Three-Dimensional Structure of Buoyant Jet by Scanning LIF and PIV

    Fujisawa Nobuyuki, Takasugi Tsuyoshi, Yamagata Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   435 - 436   2010

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  • 1207 Effect of Measurement Error in Evaluation of Pressure Field based on PIV around a Square Cylinder

    YAMAGATA Takayuki, MATSUI Toshifumi, FUJISAWA Nobuyuki, OKAMIYA Masayoshi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   447 - 448   2010

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  • 1215 PIV Measurement of Planar Abrupt Contraction Flow and the Appearance of Unstable Flow Pattern

    YAJIMA Takahiro, ANAZAWA Asahiko, FUJISAWA Nobuyuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   463 - 464   2010

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  • 1221 Liquid Drop Impact Erosion by High-Speed Water-Spray

    Kudo Yasuyuki, Fujisawa Nobuyuki, Yamagata Takayuki, Matsuura Fuminori

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   475 - 476   2010

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    DOI: 10.1299/jsmehs.2010.47.475

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  • 1222 Development of Simultaneous Measurement Technique of Temperature and Velocity by Two-Color LIF/PIV and Application to Non-Penetrated Thermal Convection

    OKAWA Yohei, FUJISAWA Nobuyuki, YAMAGATA Takayuki

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   477 - 478   2010

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  • 604 Study on Liquid Droplet Impinging Erosion Using Spray-Jet Apparatus

    HAMA Daichi, Yamagata Takayuki, TAKANO Tuyoshi, FUJISAWA Nobuyuki, KUGA Takumi

    The Proceedings of Ibaraki District Conference   2010 ( 0 )   155 - 156   2010

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    In the present paper, the erosion rate due to liquid droplet impingement has been evaluated in a small diameter range of tens of micrometers using the newly developed spray-jet apparatus. The erosion rate of aluminum material is tested with respect to the droplet parameters, such as the droplet velocity, the diameter and the number density, which are measured by optical imaging techniques. It is found that the non-dimensional erosion rate increases in proportional to the 5th power of droplet velocity, which agrees closely with that of previous study using large droplet diameters.

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  • Reproduction of the Unsteady Pressure Field of Karman Vortex Street Behind a Square Cylinder by Hybrid Wind Tunnel

    YAMAGATA Takayuki, SHIBATA Hikaru, HAYASE Toshiyuki, SMIT Kasper

    Transactions of the Japan Society of Mechanical Engineers B   74 ( 738 )   362 - 369   2008.2

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    This paper deals with the hybrid wind tunnel which combines wind tunnel experiment and numerical simulation to obtain the exact and detailed information of real flows. The hybrid wind tunnel, which is based on the observer theory, utilizes partial pressure measurement of a real flow for the numerical simulation. The measured pressure is included by the simulation through a feedback loop to overcome the difficulty of specifying exact boundary or initial conditions as well as the effect of modeling error. In this paper, the reproducibility of a pressure field on the hybrid wind tunnel, which treats a fundamental flow with the Karman vortex street behind a square cylinder, is investigated by comparison with pressure measurement on the side wall of the wind tunnel. As compared with ordinary simulation, mean pressure and pressure fluctuation reproduced by the hybrid wind tunnel agree well with that of experiment with large time steps which are inappropriate for ordinary simulations. Especially, the oscillation of the pressure synchronizes with that of experiment at -4D≦x≦3D (D: cylinder width) on the side wall of the wind tunnel, showing positive correlation with the experiment. The reduction of computational cost by using large time steps enables the hybrid wind tunnel to perform real time analysis of real flows.

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  • G603 Three-Dimensional Analysis of Karman Vortex Street Behind a Square Cylinder by Hybrid Wind Tunnel

    YAMAGATA Takayuki, HAYASE Toshiyuki

    The Proceedings of the Fluids engineering conference   2007 ( 0 )   _G603 - 1_-_G603-4_   2007

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    This study deals with the hybrid wind tunnel which combines wind tunnel experiment and numerical simulation to obtain the exact and detailed information of real flows. The hybrid wind tunnel based on the observer theory utilizes partial information of the real flow from pressure measurement for the numerical simulation through a feedback loop to overcome the difficulty of specifying exact boundary or initial conditions as well as the effect of modeling error. In previous two-dimensional analyses on the hybrid wind tunnel, the difference between computation and experiment in regard to perturbation velocity increased with the computational grid of a high resolution due to the inappropriateness of the two-dimensional model. In this paper, three-dimensional analyses with three grid systems of different resolutions are performed on the hybrid wind tunnel for a fundamental flow with the Karman vortex street behind a square cylinder. The reproducibility of a velocity field on the hybrid wind tunnel is improved in three-dimensional analysis by using the high resolution grid system. In addition, three-dimensional analysis with the coarse grid system on the hybrid wind tunnel effectively reduces the error due to the insufficient grid resolution for ordinary numerical simulation.

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  • 310 Method of Determining Unsteady Blood Flow Rate Condition in Ultrasonic-Measurement-Integrated Simulation

    YAMAGATA Takayuki, HAYASE Toshiyuki

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2006 ( 0 )   70 - 71   2007

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  • G603 Three-Dimensional Analysis of Karman Vortex Street Behind a Square Cylinder by Hybrid Wind Tunnel

    YAMAGATA Takayuki, HAYASE Toshiyuki

    The Proceedings of the Fluids engineering conference   2007 ( 0 )   _G603 - a_   2007

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  • 1304 Validation of Real-Time Analysis of Karman Vortex Street Using Hybrid Wind Tunnel(1)

    YAMAGATA Takayuki, Shibata Hikaru, SMIT Kasper, HAYASE Toshiyuki

    The Proceedings of the Fluids engineering conference   2006 ( 0 )   _1304 - a_   2006

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  • 1304 Validation of Real-Time Analysis of Karman Vortex Street Using Hybrid Wind Tunnel(2)

    YAMAGATA Takayuki, Shibata Hikaru, SMIT Kasper, HAYASE Toshiyuki

    The Proceedings of the Fluids engineering conference   2006 ( 0 )   _1304 - 1_-_1304-4_   2006

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Numerical simulation and experiment are important tools in flow analysis, but they have advantages and disadvantages. We have proposed Measurement-Integrated simulation that integrates numerical simulation and measurement to reproduce the real flows. This new methodology reproduced the velocity field of Karman vortex street behind a square cylinder in far better agreement with the real flow than the ordinary simulation. In this paper, the pressure field obtained by the MI simulation is validated in comparison with pressure measurement on the sidewall of the wind tunnel. Results show the MI simulation successfully reproduces the pressure oscillation near the cylinder although the root-mean-square pressure is degraded in the downstream region. In addition, the pressure field of Karman vortex street is analyzed and visualized in real-time using the hybrid wind tunnel.

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  • 906 Automatic Adjustment of Flow Rate in Ultrasonic-Measurement-Integrated Blood Flow Simulation System

    YAMAGATA Takayuki, HAYASE Toshiyuki

    The Proceedings of the Fluids engineering conference   2005 ( 0 )   138 - 138   2005

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  • 1109 Development of Ultrasonic-Measurement-Integrated Blood Flow Simulation System : Automatic Adjustment of Parameters

    YAMAGATA Takayuki, HAYASE Toshiyuki

    The proceedings of the JSME annual meeting   2005 ( 0 )   91 - 92   2005

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Detailed information of the velocity and pressure field of the blood flow is essential to establish an advanced diagnosis and treatment of serious circulatory diseases. Commonly used medical measurement equipments does not provide complete information of blood flow in real-time. In this report, we develop a new blood flow measurement system applying Ultrasonic- Measurement-Integrated (UMI) simulation, that integrates ultrasonography and numerical simulation. The system consists of ultrasonic diagnostic imaging equipment, a graphics workstation, and a calculation server. Computer programs for measurement data acquisition, flow simulation, and visualization are synchronized using socket communication scheme. By considering blood flow velocity measured, the system adjusted the phase of a flow rate waveform automatically to match the cycle of pulsation in real diagnostic images.

    DOI: 10.1299/jsmemecjo.2005.5.0_91

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  • B322 Measurement of Frictional Characteristics of Cells Using Inclined Centrifuge Microscope

    HAYASE Toshiyuki, SAITO Kotomi, YAMAGATA Takayuki, INOUE Kosuke, SHIRAI Atsushi

    日本流体力学会年会講演論文集   2004   534 - 535   2004

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    In order to understand precise frictional characteristics of the red blood cells in blood capillaries, the inclined centrifuge microscope has been developed, and the frictional characteristics of blood cells on a glass plate were measured as the first step. In that research, it was the subject of discussion whether the cells glide or roll on the glass plate since the resolution of the microscope was not sufficient to distinguish the cell motion. This report deals with improvement of the observation technique for cell motion. The magnification of the inclined centrifuge microscope is increased by 5 times. The shape of red blood cells under movement can be seen clearly and cells seem to glide on the glass plate, although it is still difficult to exclude the possibility of cell rolling.

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  • Effects of Nozzle Length on Jet Structure by Numerical Simulation

    SAWAMURA Toshihiro, YAMAGATA Takayuki, KANAZAWA Yukiya

    The proceedings of the JSME annual meeting   2002 ( 0 )   243 - 244   2002

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    In this study, the simulation of the cavitating jet flow which is the high speed submerged jet and spouting from nozzle is carried out, and the effects of the nozzle parallel section length on the cavitating jet is examined by the discrete vortex method the calculating results on high Reynolds number also tend to become stable easily. The result shows that the nozzle length the clear vortex structure keeps downstream exists.

    DOI: 10.1299/jsmemecjo.2002.3.0_243

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Awards

  • 優秀講演表彰

    2017.6   日本機械学会動力エネルギーシステム部門  

    山縣 貴幸

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  • 学術奨励賞

    2008.2   計測自動制御学会  

    山縣 貴幸

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  • 優秀発表奨励賞

    2006.11   計測自動制御学会東北支部  

    山縣 貴幸

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Research Projects

  • マイクロ水力発電の実用化に向けた高効率開放型クロスフロー水車の最適形状研究

    Grant number:22K05000

    2022.4 - 2027.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    藤沢 延行, 山縣 貴幸, 飯尾 昭一郎, 内山 知実, 片山 雄介

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

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  • 歳差回転運動を用いた遊星式攪拌の混合性能向上に関する研究

    Grant number:20K04346

    2020.4 - 2023.3

    System name:科学研究費助成事業

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    山縣 貴幸

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    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

    攪拌翼なしで容器の歳差回転運動のみで混合する遊星式攪拌では、歳差率を変えた場合に容器内に生じる旋回流強度と混合性能が必ずしも対応しない場合がある。そこで、容器内流れ場の慣性振動と混合性能との関係を明らかにし、遊星式攪拌の混合性能を向上させることを目的として、容器内流れ場と流体混合の数値解析および実験による検証を行う。
    今年度は、数値解析で得られた流れ場および混合性能の妥当性を検証するための実験を行った。遊星式攪拌機は自転と公転の回転速度比を2.1:1とし、容器角度は15、30、45度の条件とした。容器内にはシリコーンオイルとでんぷん粒子を入れ、回転と同期させたストロボとディジタルカメラにより容器内の混合の進展状況をミー散乱法により可視化計測した。実験結果より、容器角度が小さい場合に混合が完了するまでの時間が短く、混合性能が高くなることが明らかとなった。これは、遠心力の影響により液面の変形が増加し、容器内の流体振動が増加したためだと考えられる。これらの混合の進展状況や液面形状は、数値解析結果とよく一致しており、数値解析の妥当性を確認することができた。また、数値解析で得られた流れ場の慣性振動の特徴抽出を行うため、Dynamic mode decomposition(DMD、動的モード分解)およびProper orthogonal decomposition(POD、固有直行分解)を行った。両モード解析により、低次のモードでは歳差率による流れの振動周波数への影響は小さいが、高次のモードでは歳差率によって振動周波数が変化することが明らかとなった。

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  • 自転公転撹拌機における内部流動と混合性能の評価に関する研究

    2018.7 - 2019.3

    System name:試験研究費

    Awarding organization:内田エネルギー科学振興財団

    山縣 貴幸

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  • Development of safety management technology for pipe-wall thinning caused by flow-accelerated corrosion

    Grant number:18K04632

    2018.4 - 2021.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Fujisawa Nobuyuki

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    The investigation of pipe-wall thinning and its prediction are important topics of safety management for application to the nuclear/fossil power plant caused by flow accelerated corrosion. In this research, the mechanisms of the pipe-wall thinning for 90 degree curved elbows are investigated experimentally in and downstream of elbow of various Reynolds numbers and curvatures. Furthermore, the mass transfer enhancement mechanism is investigated on the wavy pipe walls of various height to wavelength ratios both experimentally and numerically to propose the numerical prediction method of pipe-wall thinning.

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  • 光学計測を用いた高空間解像度の流体騒音源探査システムの構築

    2013.8 - 2014.3

    System name:研究成果展開事業 研究成果最適展開支援プログラム(A-STEP)フィージビリティスタディ・ステージ 探索タイプ

    Awarding organization:科学技術振興機構

    山縣 貴幸

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    Authorship:Principal investigator  Grant type:Competitive

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  • 風車翼性能評価のための非接触圧力場計測法の開発

    2013.7 - 2014.3

    System name:試験研究費

    Awarding organization:内田エネルギー科学振興財団

    山縣 貴幸

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  • Study on mechanism and prediction of non-axisymmetric wall thinning in pipeline

    Grant number:24360391

    2012.4 - 2016.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Fujisawa Nobuyuki, EBARA Shinji, YAMAGATA Takayuki

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    Grant amount:\18460000 ( Direct Cost: \14200000 、 Indirect Cost:\4260000 )

    In order to understand the mechanism of non-axisymmetric wall-thinning in a pipeline of nuclear power plant, the velocity field and mass transfer characterisatics of the pipe due to the flow accelerated corrosion and liquid droplet impingement erosion are studied experimentally and numerically. The results are summarized as follows: 1. The flow downstream of elbow-orifice pipeline shows non-axisymmetric flow behavior, which is due to the combined effect of swirl upstream and the secondary flow in the elbow and orifice. 2. Mass transfer characteristics downstream of the elbow and orifice behaves similar to the flow field. 3. Non-axisysymmetric behavior downstream of orifice can be predicted by numerical method based on the mass and momentum equations combined with the k-εmodel of turbulence. 4. The wall-thinning due to liquid droplet impingement erosion is studied experimentally and the numerical prediction method is proposed.

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  • 光学計測を用いた非定常圧力場の非接触計測法の開発

    2011.12 - 2012.7

    System name:研究成果最適展開支援プログラム(A-STEP)フィージビリティスタディ・ステージ 探索タイプ

    Awarding organization:科学技術振興機構

    山縣 貴幸

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    Authorship:Principal investigator  Grant type:Competitive

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  • PIV計測を用いた3次元任意形状物体周りの圧力分布計測法の開発

    2010.7 - 2011.3

    System name:試験研究費

    Awarding organization:内田エネルギー科学振興財団

    山縣 貴幸

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  • 流体騒音評価のための非定常圧力場の可視化計測法の開発

    2009.7 - 2010.5

    System name:試験研究費

    Awarding organization:佐々木環境技術振興財団

    山縣 貴幸

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Teaching Experience

  • 流体工学I

    2023
    Institution name:新潟大学

  • 水素エネルギーシステムデザイン演習・実習II

    2023
    Institution name:新潟大学

  • 機械工学演習

    2022
    Institution name:新潟大学

  • 連続体力学

    2022
    Institution name:新潟大学

  • 可視化情報計測論

    2021
    Institution name:新潟大学

  • 情報機器操作入門

    2021
    Institution name:新潟大学

  • 英文輪読II

    2020
    Institution name:新潟大学

  • 機械情報可視化論

    2020
    Institution name:新潟大学

  • 機械工学実験III

    2020
    Institution name:新潟大学

  • 機械工学実験IV

    2020
    Institution name:新潟大学

  • 設計製図III

    2020
    Institution name:新潟大学

  • 卒業研究

    2020
    Institution name:新潟大学

  • 先端研究入門

    2020
    Institution name:新潟大学

  • 設計製図IV

    2020
    Institution name:新潟大学

  • くらしを支える機械システム工学

    2020
    Institution name:新潟大学

  • 英文輪読I

    2019
    Institution name:新潟大学

  • 卒業研修

    2019
    Institution name:新潟大学

  • 機械工学概論

    2018
    Institution name:新潟大学

  • 工学リテラシー入門(力学分野)

    2018
    Institution name:新潟大学

  • 物理工学実験

    2017
    Institution name:新潟大学

  • 機械工学実験II

    2017
    Institution name:新潟大学

  • 機械工学実験I

    2017
    Institution name:新潟大学

  • 工学リテラシー入門(機械システム工学科)

    2016
    Institution name:新潟大学

  • 創造工学実習

    2015
    -
    2017
    Institution name:新潟大学

  • 研究発表演習・発表

    2014
    -
    2015
    Institution name:新潟大学

  • 機械科学セミナーⅠ

    2013
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅰ

    2013
    -
    2015
    Institution name:新潟大学

  • 機械科学セミナーⅡ

    2012
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • 機械科学文献詳読Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • ソフトウエア工学

    2010
    Institution name:新潟大学

  • メカトロニクス

    2009
    -
    2022
    Institution name:新潟大学

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