Obi, Shinnosuke

写真a

Affiliation

Faculty of Science and Technology, Department of Mechanical Engineering （Yagami）

Position

Professor

Related Websites

External Links
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Career 【 Display / hide 】

  • 1988.03
    -
    1991.03

    University of Erlangen-Nuremberg, Germany, Institute of Fluid Mechanics, Researcher

  • 1991.04
    -
    1993.03

    慶應義塾大学理工学部, 助手

  • 1993.04
    -
    1996.03

    慶應義塾大学理工学部, 専任講師

  • 1994.04
    -
    1996.03

    東京大学生産技術研究所, 研究協力員

  • 1996.04
    -
    2005.03

    慶應義塾大学理工学部, 助教授

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Academic Background 【 Display / hide 】

  • 1983.03

    Keio University, Faculty of Science and Engineering, 機械工学科

    University, Graduated

  • 1984.07

    Friedrich-Alexander University Erlangen-Nuremberg, Faculty of Engineering, Department of Chemical Engineering, Chair of Fluid Mechanics

    Germany, University, Other

  • 1986.03

    Keio University, Graduate School, Division of Science and Engineering, Department of Mechanical Engineering

    Graduate School, Completed, Master's course

  • 1986.10

    Friedrich-Alexander University Erlangen-Nuremberg, Faculty of Engineering, Department of Chemical Engineering, Chair of Fluid Mechanics

    Germany, University, Other

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Academic Degrees 【 Display / hide 】

  • Dr.-Ing., Friedrich-Alexander University Erlangen-Nuremberg, Dissertation, 1991.07

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Research Areas 【 Display / hide 】

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

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Books 【 Display / hide 】

  • 乱流工学ハンドブック

    OBI SHINNOSUKE, 朝倉書店, 2009.11

    Scope: 266-269

    　View Summary

    乱流工学にかかわる広範な知識の、21世紀初頭における体系化を試みたものである。初学者にとってこの分野の概要を把握し、個別のテーマについて基礎的事項を学ぶ入門書として、研究者にとって必要に応じて参照できる専門書として、技術者にとって実際の設計や製造の現場における参考書として、広く役立たせることが企図されている。

  • 機械工学便覧　基礎編α4　流体工学

    OBI SHINNOSUKE, 丸善, 2006.01

    Scope: 52-53

    　View Summary

    第6章乱流理論と乱流拡散のうち、6.4節乱流拡散について論じた。乱流拡散と拡散係数、運動量の輸送、熱量の拡散、大気乱流、圧縮性流体の乱流について概説した。

  • The Role of Pressure-Velocity Correlation in Oscillatory Flow Between a Pair of Bluff Bodies

    Obi S., Tokai N., Sakai K., Engineering Turbulence Modelling and Experiments 6, 2005.12

    　View Summary

    This chapter studies the role of pressure-velocity correlation in oscillatory flow between a pair of bluff bodies. Turbulence models based on the Reynolds-averaged Navier-Stokes (RANS) approach often fail to predict flows associated with massive separation, in contrast to large eddy simulation (LES) that correctly captures large-scale turbulent fluid motion typically found in such flows. It is generally recognized that the poor performance of the RANS models is due to the shortcomings of the statistical approach itself in representing the coherent structure in turbulence. This chapter considers turbulent flow measurements between two bluff bodies set in uniform flow in tandem arrangement. The velocity obtained with particle image velocimetry (PIV) are averaged with respect to either time or phase of periodic pressure oscillation induced by vortex shedding from the bluff body, that is, Reynolds decomposition or three-level decomposition. The Reynolds stress caused by periodic fluid motion is found excessively large compared with those related to turbulent fluctuation in entire flow field. The PIV data is used to solve discrete Poisson equation of instantaneous pressure. The effect of organized vortex motion is recognized as the strong correlation between velocity and pressure gradient, which explains the poor performance of RANS turbulence models in predicting this kind of flows. © 2005 Elsevier B.V. All rights reserved.

  • 混相流計測法

    小尾晋之介, 森北出版, 2003.03

    Scope: 166-169

    　View Summary

    29節「単相流の壁面せん断応力のレーザ計測」を担当。局所壁面せん断応力を光学的に計測する方法について、その原理と性能的な限界、実用に際しての注意点などについて解説した。

  • PIVハンドブック

    小尾晋之介, 森北出版, 2002.07

    Scope: 242-244

    　View Summary

    8.4.3節「速度場からの圧力推定」を担当。PIVで得られた速度場情報を圧力のポアソン方程式に代入して数値的に解析することで瞬時の圧力分布を推定する方法について述べた。

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Papers 【 Display / hide 】

  • Three-Dimensional Hydrodynamic Analysis of a Flexible Caudal Fin

    May Hlaing Win Khin,Shinnosuke Obi

    Applied Sciences （MDPI)  12 （ 24 ）  2022.12

    Research paper (scientific journal), Joint Work, Last author, Accepted

    　View Summary

    A 3D fluid–structure coupled simulation of a square flexible flapper, the basic model of a caudal fin, is performed to visualize the flow field around the caudal fin. A plate immersed in a water tank is driven to oscillate vertically by its leading edge. A quantitative analysis of the thrust generated by the plate, which is difficult to explore experimentally, is performed over a range of non-dimensional flapping frequencies 0.93 (Formula presented.) 1.47 to explore the mechanism of thrust generation in more detail. Comparisons are made between three different flapping frequencies around the structural resonance. Numerical results at different flapping frequencies provide a reasonable estimate of the trailing edge amplitude and phase lag of the motion of the plate’s leading and trailing edges. The pressure distribution and deformation of the plate are analyzed to estimate the time evolution of the maximum and minimum thrust generation during the flapping period. Variations in pressure distribution on the plate surface are mainly due to the displacement of the trailing edge relative to the leading edge. Thrust is mainly provided by the pressure difference at the trailing edge. The maximum thrust was found to correspond to the maximum relative deformation of the trailing edge. The optimum frequency (Formula presented.) = 1.2 corresponding to the maximum thrust generation does not coincide with the structural resonance frequency, but remains at a frequency slightly higher than the resonance. These results indicate that the relative deformation of the plate plays an important role in the estimation of the flow field and the associated thrust generation. The numerical results may provide new guidelines for the design of robotic underwater vehicles.

  • Fluid Flow Induced By An Elastic Plate In Heaving Motion

    May Hlaing Win Khin, Kentaro Kato, Hyung Jin Sung, Shinnosuke Obi

    ASEAN Engineering Journal （Universiti Teknologi Malaysia)  12 （ 3 ） 1 - 9 2022.08

    Research paper (scientific journal), Joint Work, Last author

    　View Summary

    We perform three-dimensional simulations of an elastic plate heaving in a sinusoidal motion with different frequencies to explore the effects of the forcing heaving frequency on the hydrodynamic force generation and flow structures. It is aimed to simulate the motion of a rectangular elastic plate, representing a simplified flexible wing or fin, placed in an open water tank as in a corresponding experimental study. The top edge of the plate oscillates sinusoidally in water at rest. Simulations are conducted for the fluid structure interaction of an elastic plate with a special version of the open-source library C++ OpenFOAM, foam-extend-3.2. The plate oscillates at different heaving frequencies in a range of 3.5 Hz and 4.5 Hz. Experiments are carried out to validate our simulations. The results are in a good agreement with the experiment in terms of the representation of the resonant frequency and the induced hydrodynamic forces. It is found that the hydrodynamic force and propulsive efficiency are mainly affected by the elastic deformation and forcing heaving frequencies. The generated thrust is observed to be significantly enhanced at the resonant frequency, while the propulsive efficiency is increased at the heaving frequency which is greater than the resonant frequency. The results of our simulations point to the importance of resonant flapping frequency for considering the optimal heaving frequency to achieve the best performance and to get the improved thrust force, which are crucial for the locomotion of birds, insects, fishes, flapping-based micro air and underwater vehicles.

    Keywords: Flexible wing, fluid structure interaction, resonant frequency, thrust force, underwater vehicles

  • Numerical study of the dynamic stall effect on a pair of cross-flow hydrokinetic turbines and associated torque enhancement due to flow blockage

    Doan M.N., Obi S.

    Journal of Marine Science and Engineering （Journal of Marine Science and Engineering)  9 （ 8 ）  2021.08

    　View Summary

    An open-source 2D Reynolds-averaged Navier–Stokes (RANS) simulation model was presented and applied for a laboratory-scaled cross-flow hydrokinetic turbine and a twin turbine system in counter-rotating configurations. The computational fluid dynamics (CFD) model was compared with previously published experimental results and then used to study the turbine power output and relevant flow fields at four blockage ratios. The dynamic stall effect and related leading edge vortex (LEV) structures were observed, discussed, and correlated with the power output. The results provided insights into the blockage effect from a different perspective: The physics behind the production and maintenance of lift on the turbine blade at different blockage ratios. The model was then applied to counter-rotating configurations of the turbines and similar analyses of the torque production and maintenance were conducted. Depending on the direction of movement of the other turbine, the blade of interest could either produce higher torque or create more energy loss. For both of the scenarios where a blade interacted with the channel wall or another blade, the key behind torque enhancement was forcing the flow through its suction side and manipulating the LEV.

  • Flow field measurement of laboratory-scaled cross-flow hydrokinetic turbines: Part ii—the near-wake of twin turbines in counter-rotating configurations

    Doan M.N., Kawata T., Obi S.

    Journal of Marine Science and Engineering （Journal of Marine Science and Engineering)  9 （ 7 ）  2021.07

    　View Summary

    Cross-flow hydrokinetic turbines have sparked interest among fluid dynamicists for their potential for power enhancement in paired configuration. Following the first part of a laboratory-scaled turbine wake measurement project, this second part presents a monoscopic particle image velocimetry measurement of the near-wake of two cross-flow hydrokinetic turbines in six different counter-rotating configurations. The turbines operated in a small water flume at an average diameter-based Reynolds number of 2 × 104 with the incoming streamwise velocity of 0.316 m/s. The six configurations included two turbine separation distances, two turbine phase angles differences, and two different relative incoming flow angles. Similar to the observation of the single turbine configurations in part I, a correlation between flow field structures and the corresponding power output was observed. Effects of each parameter of the counter-rotating configurations are further discussed, which suggest guidelines for setting up multiple devices in a power farm. This article is accompanied by all full numeric data sets and videos of the results.

  • Flow field measurement of laboratory-scaled cross-flow hydrokinetic turbines: Part i—the near-wake of a single turbine

    Doan M.N., Kai Y., Kawata T., Obi S.

    Journal of Marine Science and Engineering （Journal of Marine Science and Engineering)  9 （ 5 ）  2021.05

    　View Summary

    Recent developments in marine hydrokinetic (MHK) technology have put the cross-flow (often vertical-axis) turbines at the forefront. MHK devices offer alternative solutions for clean marine energy generation as a replacement for traditional hydraulic turbines such as the Francis, Kaplan, and Pelton. Following previous power measurements of laboratory-scaled cross-flow hydrokinetic turbines in different configurations, this article presents studies of the water flow field immediately behind the turbines. Two independent turbines, which operated at an average diameter-based Reynolds number of approximately 0.2 X 105, were driven by a stepper motor at various speeds in a closed circuit water tunnel with a constant freestream velocity of 0.316 m/s. The wakes produced by the three NACA0012 blades of each turbine were recorded with a monoscopic particle image velocimetry technique and analyzed. The flow structures with velocity, vorticity, and kinetic energy fields were correlated with the turbine power production and are discussed herein. Each flow field was decomposed into the time averaged, periodic, and random components for all the cases. The results indicate the key to refining the existed turbine design for enhancement of its power production and serve as a baseline for future comparison with twin turbines in counter-rotating configurations.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Presentations 【 Display / hide 】

  • Experimental and computational fluid dynamic analysis of laboratory-scaled counter-rotating cross-flow turbines in marine environment

    DOAN MINH N., ALAYETO IVAN H., PADRICELLI CLAUDIO, OBI SHINNOSUKE, TOTSUKA YOSHITAKA

    ASME 2018 5th Joint US-European Fluids Engineering Summer Conference (Montreal, Quebec, Canada) , 

    2018.07
    , 

    Oral presentation (general), ASME FED

  • Experimental study on modeled caudal fins propelling by elastic deformation

    BABA NAOMICHI, OBI SHINNOSUKE

    ASME 2018 5th Joint US-European Fluids Engineering Summer Conference (Montreal, Quebec, Canada) , 

    2018.07
    , 

    Oral presentation (general), ASME FED

  • Measurement of the fluctuating pressure on the shroud wall of a hard-disk drive model

    SONODA YOSHIHIRO, SANADA KOHEI, OBI SHINNOSUKE

    9th International Symposium on Turbulence, Heat and Mass Transfer (Rio de Janeiro) , 

    2018.07
    , 

    Oral presentation (general), International Center for Heat and Mass Transfer

  • Emergent Issues in Education at Japanese Universities

    OBI SHINNOSUKE

    NAFSA2018 Annual Conference & Expo (Philadelphia, PA) , 

    2018.05
    , 

    Oral presentation (general), NAFSA

  • Regional Report: Some national projects for internationalization of universities in Japan

    OBI SHINNOSUKE

    Asia Pacific Association of International Education Conference 2018 (Singapore) , 

    2018.03
    , 

    Other, Asia Pacific Association of International Education

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Works 【 Display / hide 】

  • 回転体における流体関連振動の実験－HDDの空力特性－

    OBI SHINNOSUKE

    2013.03
    -
    Present
    , 

    Other, Single

    　View Details

    ハードディスクドライブ（HDD）の内部は高レイノルズ数の乱流場である．速度変動や圧力変動がディスクやデータ読み書きのヘッドアームなどに及ぼす影響は無視できず，これらを抑える試みが数多く行われ，一部は製品に採用されている．ディスク振動と乱流場に関係があることは原理としては分かっているが，それを低減させることは容易ではない．この講義では実験と数値シミュレーション両面のアプローチによる流れの基本的な構造の理解と，HDDにおける流体関連振動の低減を目指した実験的な試みについて紹介する．

  • Double Degree Strategy at Keio University Graduate School of Science and Technology

    OBI SHINNOSUKE

    2013.01
    , 

    Other, Single

    　View Details

    慶應義塾大学理工学部・大学院理工学研究科で取り入れているダブルディグリープログラムについて、実績と内容について紹介した。2005年に導入したフランス・エコールサントラルグループとの交流では2012年9月時点で日本人派遣者数累積47名、フランス人受け入れ同74名、学位授与者同62名を数える。2010年度に開始した修士課程のTIMEプログラムでは5校に累計13名を派遣した。

  • International Higher Education Symposium - Faculty Development of International Student Education -

    OBI SHINNOSUKE

    Kyoto, 

    2011.03
    , 

    Other, Single

    　View Details

    Current issues in the international education are discussed. A presentation was made on the programs offered at the Faculty of Science and Technology of Keio University, with particular emphasis being put on the operation of the double degree degree with Ecole Centrale Group and T.I.M.E. Association.

  • ダブルディグリーによる国際工学教育

    OBI SHINNOSUKE

    仙台, 

    2010.08
    , 

    Other, Single

    　View Details

    工学教育の国際化への取り組みの事例として慶應義塾大学理工学部・大学院理工学研究科で行われているダブルディグリープログラムの概要を紹介した。

  • Bologna from Outside - Reception and Impacts in Asia/Japan

    OBI SHINNOSUKE

    Siegburg, Germany, 

    2009.04
    , 

    Other, Single

    　View Details

    The reception and impacts by Bologna process on the higher education policy in Asia/Japan are reported. The impact on ASEAN region is remarkable, while it is not visible in Japan. Keio University's activities in international education program are presented with particular interest on double degree program runnning with European partners.

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Awards 【 Display / hide 】

  • 日本機械学会流体工学部門 部門賞

    小尾　晋之介, 2021.11, 一般社団法人 日本機械学会

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 日本機械学会第78期流体工学部門賞「貢献表彰」

    OBI SHINNOSUKE, 2000.09

    Type of Award： Award from Japanese society, conference, symposium, etc.

    　View Description

    講演論文集のCD-ROM化を担当し，電子原稿書式の検討，テンプレートの作成，原稿の受取りと取りまとめ等を献身的に行い，部門講演会で初のCD-ROM化を実現した．

  • 平成９年度　日本流体力学会賞「竜門賞」

    小尾 晋之介, 1998.02, 日本流体力学会

    Type of Award： Award from Japanese society, conference, symposium, etc.

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Courses Taught 【 Display / hide 】

  • PROJECT LABORATORY IN MECHANICAL ENGINEERING

    2024

  • LABORATORIES IN SCIENCE AND TECHNOLOGY

    2024

  • INTRODUCTION TO FLUID MECHANICS

    2024

  • INTRODUCTION TO COMPUTER SIMULATION

    2024

  • INDEPENDENT STUDY ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS

    2024

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Social Activities 【 Display / hide 】

  • 公的財団法人佐藤陽国際奨学財団 選考委員

    公的財団法人佐藤陽国際奨学財団

    2014
    -
    2022.06

  • 公益信託三井物産インドネシア奨学基金

    2012.12
    -
    Present

  • TKT CAMPUS Asia Consortium国際評価パネル議長

    2015.12
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Memberships in Academic Societies 【 Display / hide 】

  • （社）土木学会, 

    2003
    -
    Present

  • Gasturbine Society of Japan, 

    2001
    -
    Present

  • （社）日本伝熱学会, 

    1997
    -
    Present

  • （社）日本機械学会, 

    1994
    -
    Present

  • （社）日本流体力学会, 

    1994
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2022.04
    -
    2022.09

    東京工業大学スーパーグローバル大学創成支援事業（SGU）外部評価委員, 国立大学法人東京工業大学

  • 2021.06
    -
    2022.03

    国費外国人留学生現地選考試験問題作成事業選定委員会　委員, 文部科学省

  • 2021.06
    -
    2022.03

    日本留学海外拠点連携推進事業実施委員会　委員, 文部科学省

  • 2021.05
    -
    2024.02

    先導的大学改革推進委託事業審査委員会 委員, 文部科学省　

  • 2021.04
    -
    2023.03

    代議員, 一般社団法人　日本流体力学会

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