KEIO RESEARCHERS INFORMATION SYSTEM

Career 【 Display / hide 】

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 】

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

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

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

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

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

Books 【 Display / hide 】

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 】

Papers 【 Display / hide 】

• Comparative Analysis of Vortex Field Measurement around MHK Turbine Blades using PIV and CFD Techniques

  Hafdaoui A., Tanaka S., Doan M.N., Obi S.

  ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) 8 2024.11

  Research paper (international conference proceedings), Joint Work, Last author, Accepted

  　View Summary

  Cross-flow turbines have been recently re-discovered in the fields of wind and tidal energy thanks to the high power density they can provide when arranged in arrays. In this paper, we investigate the mechanism of torque generation and maintenance of a pair of miniature Marine Hydrokinetic Turbines via Particle Image Velocimetry, providing new insights on the influence of vortex shedding onto the lift generation process. The velocity field around the blades was measured for two different tip speed ratios and across various configurations of the devices, to then evaluate the forces involved by performing a momentum balance over moving control volumes. Our findings suggest that a lift force was first generated, in line with the airfoil theory, by the flow acceleration on the inner surface of the blade, and was subsequently maintained after the onset of dynamic stall by the low pressure associated with a leading-edge vortex. Furthermore, increases in tip speed ratio and blockage effect were observed to positively impact vortex strength and torque production. The results were compared with two-dimensional CFD studies for the purpose of validating the control volume method for torque estimation, as well as discussing and quantifying the 3D effect.

  • Access to Document (DOI)

• Revisiting the Flow Instability of Shrouded Corotating Disk Systems

  Watanabe A., Obi S.

  ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) 5 2024.11

  Research paper (international conference proceedings), Joint Work, Corresponding author, Accepted

  　View Summary

  In disk drive systems, flow-induced vibration, often attributed to turbulent fluid motion, presents a significant challenge due to its wide-ranging frequency spectra. Helium-filled enclosures have been introduced to mitigate this issue by reducing the force exerted by fluid motion, owing to the lower gas density compared to air. This density reduction leads to a decrease in the inertia force relative to the viscous force, lowering the Reynolds number by nearly an order of magnitude and resulting in an anticipated transition from turbulent to laminar flow. However, the transitional regime poses challenges, potentially causing intermittently alternating flow motion between turbulent and laminar states, characterized by velocity fluctuations of larger magnitude. Our experimental study involved a series of tests with a system comprising five 3.5-inch disks enclosed within a cylindrical casing. Varying the disk rotation speed from 600 rpm to 7200 rpm resulted in Reynolds numbers ranging from about 1×104 to 1×105. While air-filled configurations consistently exhibited fully turbulent flow, helium-filled setups demonstrated laminar characteristics at lower Reynolds numbers. Our findings suggest transitional behavior at intermediate Reynolds number ranges, indicating a shift from stable to unstable flow patterns. These observations underscore the potential challenges associated with helium-filled disk systems.

  • Access to Document (DOI)

• Numerical Study on the Hydrodynamic Performance of a Flexible Caudal Fin with Different Trailing-Edge Shapes

  Khin M.H.W., Obi S.

  Biomimetics (MDPI)  9 ( 7 )  2024.07

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

  　View Summary

  This paper presents a three-dimensional fluid-structure-coupled simulation of a flexible caudal fin with different trailing-edge shapes. The influences of caudal-fin shape on hydrodynamic performance are investigated by comparing the results of a simplified model of a square caudal fin with forked and deeply forked caudal fins under a wider range of non-dimensional flapping frequency, 0.6 < f* < 1.5, where f* is the ratio of flapping frequency to the natural frequency of each caudal fin, i.e., f* = f/fn. The leading edge of each caudal fin is forced to oscillate vertically in a water tank with zero free-stream conditions. The numerical results show that the amount of forking in the geometry of the caudal fin has significant effects on its hydrodynamic performance. A comparison of thrust coefficients shows that the square caudal fin has a greater thrust coefficient in the non-dimensional frequency range of 0.6 < f* < 1.2, while the deeply forked caudal fin generates higher thrust when 1.2 < f* < 1.5. In terms of propulsive efficiency, the square caudal fin is more efficient when 0.6 < f* < 0.9, while the propulsive efficiency of a deeply forked caudal fin is significantly enhanced when 0.9 < f* < 1.5. Based on our results, the deeply forked caudal fin has greater thrust coefficients and a higher propulsive efficiency in a higher frequency range than the natural frequency of each caudal fin. The thrust characteristics and flow fields around each caudal fin are investigated in detail.

  • Access to Document (DOI)

• Experimental Study of Instantaneous Velocity-Pressure Correlations by PIV Measurement in a Turbulent Pipe Flow with Drag Reduction by Added Surfactant

  Yoshida, T., Obi, S.

  13th International Symposium on Turbulence and Shear Flow Phenomena  2024.06

  Research paper (international conference proceedings), Joint Work, Last author, Accepted

• 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.

  • Access to Document (DOI)

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

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

• Optimization of the dual vertical-axis-turbine system towards the efficient use of renewable energy resource

  Obi, Shinnosuke

  学事振興資金研究成果実績報告書 (慶應義塾大学)  2018

• Internal regulation to promote internationalization of university

  Obi, Shinnosuke

  Keio SFC journal (慶應義塾大学湘南藤沢学会)  17 ( 2 ) 6 - 11 2017

  ISSN  13472828

Presentations 【 Display / hide 】

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 】

Works 【 Display / hide 】

• 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.

• Implementation of Double-Degree Programs at Keio University

  OBI SHINNOSUKE

  Washington DC, 

  2008.05

  , 

  Other, Single

  　View Details

  In 2005, Keio’s Graduate School of Science and Technology and the French Intergroupe des Ecoles Centrale (EC) established the Keio-EC Double Degree Master’s Program to foster top international engineers. The graduation of its first class in September of 2007 provides a good opportunity to explore why the program has been so successful and whether this approach might serve as a model for double degree schemes among American and Japanese institutions. Professor Shinnosuke Obi, Director of Keio’s International Center and a professor of mechanical engineering, will outline the structure and process for designing the program and suggest that while formidable obstacles to developing and running a successful international double degree program can exist, such as differing educational systems, and issues relating to language and quality assurance, a well thought out plan, a committed team, and institutional endorsement can overcome them.

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Awards 【 Display / hide 】

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.

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• ADVANCED COURSE IN APPLIED AND COMPUTATIONAL MECHANICS 1

  2025

• PROJECT LABORATORY IN MECHANICAL ENGINEERING

  2025

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2025

• INTRODUCTION TO FLUID MECHANICS

  2025

• INTRODUCTION TO COMPUTER SIMULATION

  2025

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Social Activities 【 Display / hide 】

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

Media Coverage 【 Display / hide 】

Media Coverage 【 Display / hide 】

• 理工系学生の視野広げる

  日本経済新聞社, 日本経済新聞 (教育（31面）) , 2022.10

  　View Summary

  慶應義塾大学理工学部が欧州高等教育機関との協力で運用してきたダブルディグリープログラムをとりあげ、異文化を知るエンジニアの育成の取り組みの一例として紹介した。

Memberships in Academic Societies 【 Display / hide 】

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）可視化情報学会, 

  1994

  -

  Present

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Committee Experiences 【 Display / hide 】

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

  -

  2026.02

  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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