SEKIYA Naoki

Department of Mechanical EngineeringAssociate Professor

Researcher Information

Research Keyword

  • Low Reynlds Number Flow
  • Laminar Spot
  • Boundary-layer transition
  • Wind Turbines
  • Computational Fluid Dynamics
  • Boundary Layer Flow

Field Of Study

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Fluid engineering, Fluidics

Career

  • Apr. 2020 - Present
    Nihon University, College of Science and Technology, Associate Professor
  • Apr. 2012 - Mar. 2020
    日本大学理工学部,助教, College of Science and Technology, Asistant Professor
  • Apr. 2007 - Mar. 2012
    日本大学理工学部 助手
  • Apr. 2005 - Mar. 2007
    日本大学理工学部 副手

Educational Background

  • 2005
    Nihon University, Graduate School, Division of Science and Engineering, Mechanical Engineering

Member History

  • Apr. 2013 - Mar. 2014
    流体工学部門 技術委員会(講習会WG), 日本機械学会
Research activity information

Paper

  • 垂直軸風車が後流の速度場におよぼす影響
    渡辺真巳・松本彰・関谷直樹
    日本機械学会論文集, Apr. 2014, Refereed, Not invited
    Corresponding
  • Development of an Irregularity in the Laminar-Turbulent Transition of the Spot
    Naoki SEKIYA; Akira MATSUMOTO
    日本航空宇宙学会論文集, Jul. 2010, Refereed, Not invited
    Lead
  • Downstream Development of a Laminar Spot
    Naoki Sekiya/ Akira Matsumoto
    Journal of Fluid Science and Technology, Apr. 2009, Refereed, Not invited
    Lead
  • Development of a Hot-wire Probe with Two Parallel Wires Placed Closely Together
    Naoki Sekiya/ Akira Matsumoto
    Journal of Fluid Science and Technology, Feb. 2009, Refereed, Not invited
    Lead
  • 新しい熱線プローブの開発
    関谷直樹/松本彰
    Transactions of The Japan Society of Mechanical Engineers Series B, Mar. 2007, Refereed, Not invited
    Lead

MISC

  • Downstream Development of Hairpin Vortex Pair Travelling in Parallel
    川田 治斗; 関谷 直樹
    日本機械学会 関東支部第 30 期総会・講演会, 14 Mar. 2023, Not invited
  • Interference of Longitudinal Vortices shed from a Cylinder with locally narrow steps
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2022, Not refereed
  • Characteristics of the Wake of the inclined VAWT
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2021, Not refereed
  • Relationship between Solidity and Wake Flow Characteristics of Vertical Axis Wind Turbines
    SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2021, Not refereed
  • Characteristics of the Velocity Profiles behind of the Low-Solidity VAWT
    SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2020, Not refereed
  • Undeveloped Spot Generated into the Laminar Boundary Layer
    SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2019, Not refereed
  • Relation Between Wave Number of Velocity Fluctuation in the Spot and Its Downstream Development
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2019, Not refereed
  • Similarity of the Output Characteristics of the Small Vertical Axis Wind Turbine
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2018, Not refereed
  • Effect of the length of middle part on the wake of the multi stepped circular cylinder
    SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2018, Not refereed
  • Influence of rotor diameter of vertical axis wind turbine on output characteristics
    HANADA Ryosuke; SEKIYA Naoki
    The Proceedings of Conference of Chugoku-Shikoku Branch, 2017, Not refereed
  • Effect of Reynolds number on the downstream development of a small disturbance in transitional boundary layer
    SEKIYA Naoki
    The Proceedings of Conference of Chugoku-Shikoku Branch, 2017, Not refereed
  • Effect of Wind Velocity on the Characteristics of the Turbine Power of the Vertical Axis Wind Turbine
    HANADA Ryosuke; SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2016, Not refereed
  • Effect of Intensity of the Disturbance on the Downstream Development of the Laminar Spot
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2016, Not refereed
  • 502 Influence of the number of blades on the wake flow behind the vertical wind turbine
    WATANABE Mami; SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2015, Not refereed
  • G0500406 Influence of the Diameter Ratio on the Wake Flow behind a Stepped Circular Cylinder
    TOKUDA Naoyuki; SEKIYA Naoki
    The Proceedings of Mechanical Engineering Congress, Japan, 2015, Not refereed
  • G0203 Measuring for the Pressure on a Flat-Plate Wing using the Pressure-Sensor for Low Reynolds numbers.
    WATANABE Masashi; SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of the Fluids engineering conference, 2013, Not refereed
  • G0205 Velocity Measurement of Wake-Flow behind Vertical Wind Turbine Model
    WATANABE Mami; SEKIYA Naoki; MATUMOTO Akira
    The Proceedings of the Fluids engineering conference, 2013, Not refereed
  • 502 Development of micro pressure sensor mounted on the wing surface at low Reynolds numbers
    HATTORI Hirochika; SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2012, Not refereed
  • 119 Velocity Field around the Vertical Wind Turbine Model
    FUKASAWA Yuto; SEKIYA Naoki; MATUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2012, Not refereed
  • 307 Wake-flow Characteristics of a Stepped Circular Cylinder
    YAMAMOTO Masatoshi; SEKIYA Naoki; MATUMOTO Akira
    The Proceedings of Yamanashi District Conference, 22 Oct. 2011, Not refereed
  • 306 Wake-flow Measurement of Vertical Wind Turbine Model
    FUKASAWA Yuto; SEKIYA Naoki; MATUMOTO Akira
    The Proceedings of Yamanashi District Conference, 2011, Not refereed
  • S0505-2-2 Production of the Turbulence related to the Spanwise Instability in the Transitional region from a Laminar to a Turbulent spot
    SEKIYA Naoki; MATSUMOTO Akira
    The proceedings of the JSME annual meeting, 2010, Not refereed
  • 708 Instability in the Transitional region from a Laminar to a Turbulent spot
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2010, Not refereed
  • G505 Manufacture of a Micro-pressure Sensor using MEMS Technology
    MAENO Yuki; MATSUMOTO Akira; SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2009, Not refereed
  • Growth of the Irregularity in the Transition from a Laminar to a Turbulent spot
    Sekiya Naoki; Matsumoto Akira
    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 2009
  • 0206 Production of the Turbulent Regions in the Transition from a Laminar to a Turbulent spot
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of the Fluids engineering conference, 2009, Not refereed
  • 305 Aerodynamic Characteristics of Wing Sections for Wind Turbine
    MAENO Yuki; MATSUMOTO Akira; SEKIYA Naoki
    The Proceedings of Yamanashi District Conference, 2008, Not refereed
  • 304 Downstream development of longitudinal vortices formed by various disturbances
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Yamanashi District Conference, 2008, Not refereed
  • 層流境界層に導入した様々な撹乱の下流発達
    関谷直樹
    日本流体力学会年会2008拡張要旨集, 2008
  • Downstream Development of a Laminar Spot : Influence of the Reynolds Number of Boundary Layer on the Spot
    SEKIYA,Naoki; MATSUMOTO,Akira
    日本流体力学会年会講演論文集, 06 Aug. 2007
  • 202 Downstream development of a point disturbance injected into a laminar boundary layer : Influence of the Reynolds number on the development of a point disturbance(1)
    SEKIYA Naoki; ONO Kiyoaki; MATSUMOTO Akira
    The Proceedings of the Fluids engineering conference, 2007, Not refereed
  • C21 On the flow around the inclined plates at Low Reynolds Number
    SUGIYAMA Hisaya; MATSUMOTO Akira; SEKIYA Naoki
    The Proceedings of Conference of Kyushu Branch, 2007, Not refereed
  • 701 Manufacture of a micro pressure sensor using MEMS technology
    AKIYAMA Daisuke; MATSUMOTO Akira; SEKIYA Naoki
    The Proceedings of Yamanashi District Conference, 2007, Not refereed
  • 402 Some features of wake of a circular cylinder with different diameters
    UEDA Hisashi; MATSUMOTO Akira; SEKIYA Naoki
    The Proceedings of Yamanashi District Conference, 2007, Not refereed
  • C22 Downstream development of a laminar spot : Influence of the disturbance-intensity on the spot
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2007, Not refereed
  • 3943 Wake-flow Measurements of Rectangular Wing at Low Reynolds Number
    SUGIYAMA Hisaya; MATSUMOTO Akira; SEKIYA Naoki
    The proceedings of the JSME annual meeting, 2006, Not refereed
  • 4035 Transition of a Laminar Spot into a Turbulent Spot
    SEKIYA Naoki; MATSUMOTO Akira
    The proceedings of the JSME annual meeting, 2006, Not refereed
  • C24 Structure of a Laminar Spot in the Transitional Region
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2006, Not refereed
  • G505 Downstream Development of a Laminar Spot : The Birth of a Wing-like Low-speed Region
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of the Fluids engineering conference, 2005, Not refereed
  • 1006 Downstream Development of a Laminar Spot Growth of a Spot in Span wise
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2005, Not refereed
  • Downstream Development of a Laminar Spot : Measurements of V velocity component
    SEKIYA Naoki; MATSUMOTO Akira
    The proceedings of the JSME annual meeting, 2004, Not refereed
  • Measurements of a Laminar Spot using a New Parallel-Wire Probe
    SEKIYA Naoki; MATSUMOTO Akira
    The Proceedings of Conference of Kyushu Branch, 2004, Not refereed
  • Measurement of Boundary-Layer Flow using a New Hot-Wire Probe
    SEKIYA Naoki; MATSUMOTO Akira
    The proceedings of the JSME annual meeting, 2003, Not refereed

Books and other publications

  • 機械系コアテキストシリーズ 流体力学
    鈴木康方; 関谷直樹; 彭國義; 松島均; 沖田浩平, Joint work, 2章, 鈴木康方,関谷直樹,彭國義,松島均,沖田浩平
    コロナ社, Jun. 2018, Not refereed
    9784339045352
  • 機械工学キーワード120
    李和樹, Joint work, 李和樹,他20名
    コロナ社, Mar. 2012, Not refereed

Lectures, oral presentations, etc.

  • Downstream Development of Hairpin Vortex Pair Travelling in Parallel
    川田 治斗; 関谷 直樹
    日本機械学会 関東支部第 30 期総会・講演会, Mar. 2023, Not invited
  • Interference of Longitudinal Vortices shed from a Cylinder with locally narrow steps
    SEKIYA Naoki
    The Proceedings of the Fluids engineering conference, 2022, The Japan Society of Mechanical Engineers
  • Characteristics of the Wake of the inclined VAWT
    Naoki Sekiya
    日本機械学会 第99期 流体工学部門 講演会, Nov. 2021, 日本機械学会, Not invited
  • Relationship between Solidity and Wake Flow Characteristics of Vertical Axis Wind Turbines
    Naoki Sekiya
    Sep. 2021, 日本機械学会, Not invited
  • 低ソリディティ垂直軸風車の速度分布特性
    日本機械学会２０２０年度年次大会, Sep. 2020, 日本機械学会, Not invited
  • Relation Between Wave Number of Velocity Fluctuation in the Spot and Its Downstream Development
    関谷直樹
    日本機械学会 第97期 流体工学部門 講演会, Nov. 2019, Not invited
  • Undeveloped Spot Generated into the Laminar Boundary Layer
    関谷直樹
    日本機械学会2019年度年次大会, Sep. 2019, 日本機械学会, Not invited
  • Similarity of the Output Characteristics of the Small Vertical Axis Wind Turbine
    Naoki Sekiya
    ASME-JSME-KSME Joint Fluids Engineering Conference 2019, Jul. 2019, Not invited
  • Similarity of the Output Characteristics of the Small Vertical Axis Wind Turbine
    Naoki SEKIYA
    第96期流体工学部門講演会, Nov. 2018, 日本機械学会, Not invited
  • Effect of the length of middle part on the wake of the multi stepped circular cylinder
    Naoki SEKIYA
    日本機械学会2018年度年次大会, Sep. 2018, 日本機械学会, Not invited
  • Effect of Turbine Diameter on Shaft Output of the Vertical Axis Wind Turbine
    花田諒介/関谷直樹
    6th Pacific Asia Conference on Mechanical, Aug. 2017, Not invited
  • 境界層に導⼊された点撹乱の下流発達に与えるレイノルズ数の影響
    関谷直樹
    日本機械学会中国四国支部第55期総会・講演会, Mar. 2017, 日本機械学会, Not invited
  • 垂直軸型⾵⾞軸出⼒に対するローター直径の影響
    花田諒介/関谷直樹
    日本機械学会中国四国支部第55期総会・講演会, Mar. 2017, 日本機械学会, Not invited
  • 境界層に導⼊された点撹乱の下流発達に与えるレイノルズ数の影響
    関谷直樹
    日本機械学会中国四国支部第55期総会・講演会, Mar. 2017, 日本機械学会, Not invited
  • 層流斑点の下流発達における攪乱強さの影響
    関谷直樹
    日本機械学会 第94期 流体工学部門 講演会, Nov. 2016, 日本機械学会, Not invited
  • 垂直軸型風車の軸出力特性に与える風速の影響
    花田諒介/関谷直樹
    日本機械学会2016年度年次大会, Sep. 2016, 日本機械学会, Not invited
  • 径違い円柱の伴流に径比が与える影響
    関谷直樹/徳田尚晋
    日本機械学会2015年度年次大会, Sep. 2015, 日本機械学会, Not invited
  • 垂直軸風車のブレード数が風車後流に与える影響
    渡辺真巳/関谷直樹/松本彰
    日本機械学会九州支部第68期総会・講演会, Mar. 2015, 日本機械学会, Not invited
  • 様々な撹乱ジェットにより生成された渦構造の崩壊
    関谷直樹/松本彰
    流体力学会年会2014, Sep. 2014, 日本流体力学会, Not invited
  • 垂直軸風車モデル後流の速度分布測定
    渡辺真巳/関谷直樹/松本彰
    第91期日本機械学会流体工学部門講演会, Nov. 2013, 日本機械学会, Not invited
  • 低レイノズル数用圧力センサーによる平板翼の圧力測定
    渡辺将士/関谷直樹/松本彰
    第91期日本機械学会流体工学部門講演会, Nov. 2013, 日本機械学会, Not invited
  • Wake-flow Charactristic of a Stepped Circular Cylinder
    山本真稔/関谷直樹/松本彰
    5th Pacific Asia Conference on Mechanical Engineering, Aug. 2012, Not invited
  • EFFECT OF A SPANWISE FLOW ON THE LAMINAR-TURBULENT TRANSITION
    関谷直樹/松本彰
    9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Jul. 2012, Not invited
  • 低レイノルズ数における翼面実装型微差圧センサーの開発
    服部宏史/関谷直樹/松本彰
    日本機械学会九州支部第65期総会・講演会, Mar. 2012, 日本機械学会, Not invited
  • 垂直軸型風車モデル周りの速度場
    深澤勇斗/関谷直樹/松本彰
    日本機械学会九州支部第65期総会・講演会, Mar. 2012, 日本機械学会, Not invited
  • 垂直軸風車モデルの伴流測定
    深澤勇斗/関谷直樹/松本彰
    日本機械学会山梨講演会, Oct. 2011, 日本機械学会, Not invited
  • 径違い円柱の伴流特性
    山本真稔/関谷直樹/松本彰
    日本機械学会山梨講演会, Oct. 2011, 日本機械学会, Not invited
  • 境界層遷移に及ぼすスパン方向流れの影響
    関谷直樹/松本彰
    流体力学会年会2011, Sep. 2011, 日本流体力学会, Not invited
  • 乱流斑点への遷移領域におけるスパン方向不安定と乱れの生成
    松本彰
    日本機械学会2010年度年次大会, Sep. 2010, 日本機械学会, Not invited
  • 乱流斑点への遷移領域における不安定性
    松本彰
    日本機械学会九州支部第63期総会・講演会, Mar. 2010, 日本機械学会, Not invited
  • 層流斑点から乱流斑点への遷移における乱れ領域の増殖
    松本彰
    第87期日本機械学会流体工学部門講演会, Nov. 2009, 日本機械学会, Not invited
  • MEMS技術を用いた微差圧センサーの製作
    前野優輝/関谷直樹/松本彰
    第87期日本機械学会流体工学部門講演会, Nov. 2009, 日本機械学会, Not invited
  • 層流斑点から乱流斑点への遷移における不規則性の発達
    関谷直樹/ 松本彰
    第58回理論応用力学講演会, Jun. 2009, 日本学術会議, Not invited
  • 様々な形状の撹乱により生成された縦渦の下流発達
    関谷直樹/ 松本彰
    日本機械学会山梨講演会, Oct. 2008, 日本機械学会, Not invited
  • 風車用翼型の空力特性
    前野優輝/関谷直樹/松本彰
    日本機械学会山梨講演会, Oct. 2008, 日本機械学会, Not invited
  • 層流境界層に導入した様々な撹乱の下流発達
    関谷直樹/ 小野清秋/ 松本彰
    流体力学会年会2008, Sep. 2008, 日本流体力学会, Not invited
  • 層流境界層に導入された点撹乱の下流発達(レイノルズ数が撹乱の発達に及ぼす影響)
    関谷直樹/ 小野清秋/ 松本彰
    第85期日本機械学会流体工学部門講演会, Nov. 2007, 日本機械学会, Not invited
  • MEMS技術を用いた微差圧センサーの製作
    秋山大輔/関谷直樹/松本彰
    日本機械学会山梨講演会, Oct. 2007, 日本機械学会, Not invited
  • 異径円柱の伴流特性
    上田恆/関谷直樹/松本彰
    日本機械学会山梨講演会, Oct. 2007, 日本機械学会, Not invited
  • 層流斑点の下流発達(レイノルズ数が斑点に及ぼす影響)
    関谷直樹/ 松本彰
    流体力学会年会2007, Aug. 2007, 日本流体力学会, Not invited
  • 様々な形状の撹乱により生成された層流斑点の下流発達
    関谷直樹/松本彰
    4th Pacific Asia Conference on Mechanical Engineering, Aug. 2007, Not invited
  • 異型円柱の伴流特性
    上田恆/関谷直樹/松本彰
    4th Pacific Asia Conference on Mechanical Engineering, Aug. 2007, Not invited
  • Downstream development of a laminar spot (Influence of the disturbance-intensity on the spot)
    関谷直樹/松本彰
    日本機械学会九州支部第60期総会講演会, Mar. 2007, 日本機械学会, Not invited
  • 低レイノルズ数における傾斜平板周りの流れ
    國友紀和; 関谷直樹; 松本彰
    自動車技術会関東支部2006年度学術研究講演会, Mar. 2007, 自動車技術開関東支部, Not invited
  • フォーミュラーカーのサイドポッドモデルにおける空力特性
    斎藤輔/関谷直樹/松本彰
    自動車技術会関東支部2006年度学術研究講演会, Mar. 2007, 自動車技術開関東支部, Not invited
  • 異径円柱の近接伴流の構造に関する研究
    上田恆/関谷直樹/松本彰
    自動車技術会関東支部2006年度学術研究講演会, Mar. 2007, 自動車技術開関東支部, Not invited
  • 低レイノルズ数における傾斜平板周りの流れ
    國友紀和/関谷直樹/松本彰
    自動車技術会関東支部2006年度学術研究講演会, Mar. 2007, 自動車技術開関東支部, Not invited
  • The Effect of a Disturbance on a Laminar Spot at Initial Stage of its Downstream Development
    関谷直樹/小野清秋/松本彰
    第20回数値流体力学シンポジウム, Dec. 2006, 日本流体力学会, Not invited
  • Structure of a laminar spot at initial stage of its downstream development
    関谷直樹/小野清秋/松本彰
    第38回流体力学講演会, Sep. 2006, 日本航空宇宙学会, Not invited
  • Transition of a Laminar Spot into a Turbulent Spot
    関谷直樹/松本彰
    Mechanical Engineering Congress 2006, Sep. 2006, 日本機械学会, Not invited
  • 低レイノルズ数における平板翼の伴流測定
    杉山尚弥/関谷直樹/松本彰
    日本機械学会2006年度年次大会, Sep. 2006, 日本機械学会, Not invited
  • Structure of a Laminar Spot in the Transitional Region
    関谷直樹/松本彰
    日本機械学会九州支部第59期総会講演会, Mar. 2006, 日本機械学会, Not invited
  • Downstream Development of a Laminar Spot (The Birth of a Wing-like Low-speed Region)
    関谷直樹/松本彰
    Fluids Engineering Conference 2005, Oct. 2005, 日本機械学会, Not invited
  • STRUCTURE OF A LAMINAR SPOT IN A TRANSITIONAL BOUNDARY LAYER
    関谷直樹/松本彰
    4th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Sep. 2005, Not invited
  • 層流斑点の下流発達 -横幅方向の成長-
    関谷直樹/松本彰
    日本機械学会九州支部第58期総会講演会, Mar. 2005, 日本機械学会, Not invited
  • Downstream Development of a Laminar Spot (Measurements of V velocity component)
    関谷直樹/松本彰
    Mechanical Engineering Congress 2004, Sep. 2004, 日本機械学会, Not invited
  • DEVELOPMENT OF A NEW HOT-WIRE ANEMOMETER WITH TWO PARALLEL WIRES PLACED CLOSE TOGETHER
    関谷直樹/松本彰
    3rd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Jun. 2004, Not invited
  • Measurements of a Laminar Spot using a New Parallel-Wire Probe
    関谷直樹/松本彰
    日本機械学会九州支部第57期総会講演会, Mar. 2004, 日本機械学会, Not invited
  • Measurement of Boundary-Layer Flow using a New Hot-Wire Probe
    関谷直樹/松本彰
    Mechanical Engineering Congress 2003, Aug. 2003, 日本機械学会, Not invited

Affiliated academic society

  • The Japan Society of Mechanical Engineers
  • The Japan Society of Fluid Mechanics
  • The Japan Society for Aeronautical and Space Sciences
  • Society of Automotive Engineers of Japan