MIYAJI Koji

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Associate Professor

Date of Birth

1970

Research Fields, Keywords

Compressible fluid dynamics, Aeroelastic dynamics, Aerospace engineering, Computational fluid dynamics

Mail Address

E-mail address



The Best Research Achievement in the last 5 years 【 display / non-display

Education 【 display / non-display

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    1997

    The University of Tokyo   Department of Aerospace engineering   Doctor Course   Completed

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    1994

    The University of Tokyo   Department of Aerospace Engineering   Master Course   Completed

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    1992

    Nagoya University   Department of aeronautics   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - The University of Tokyo

Campus Career 【 display / non-display

  • 2007.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2004.12
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2001.4
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    2004.11

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Lecturer  

  • 1999.4
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    2001.3

    Duty   Yokohama National UniversitySchool of Engineering   Lecturer  

  • 2021.4
     
     

    Concurrently   Yokohama National UniversityInterfaculty Graduate School of Innovative and Practical Studies   Associate Professor  

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External Career 【 display / non-display

  • 1997.4
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    1999.3

    Research fellow of the center of excellence (COE) at the Institute of Space and Astronautical Science   Researcher  

Academic Society Affiliations 【 display / non-display

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    Japan Society for Aeronautical and Space Sciences

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    Japan Society of Mechanical Engineering

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    Japan Socieyt of Fluid Mechanics

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    American Institute of Aeronautics and Astronautics

Research Areas 【 display / non-display

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Aerospace engineering  / Aerospace engineering

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

  • Others / Others  / Computational fluid dynamics

 

Thesis for a degree 【 display / non-display

  • Numerical Analysis of Shock Wave Reflection and Interaction Using Unstructured Solution Adaptive Grids

    1997.3

    Doctoral Thesis   Single Work  

    DOI

  • デルタ翼の空力特性に及ぼすTrailing-Edge Lateral Blowingの効果

    宮路 幸二

    1994.3

    Master Thesis   Single Work  

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    東京大学大学院 工学系研究科 航空宇宙工学専攻 
    デルタ翼の新たな空力特性改善手法として翼付近からの噴き出しを提案し、その効果を実験的、数値的に確認した。また、風洞実験との比較の過程において風洞側壁境界層がデルタ翼まわりの流れに影響を与えることを見出し、数値計算によりその影響を定量的に議論した。

Papers 【 display / non-display

  • Predictions of Fluid-Induced Self-Excited Oscillations by the Time-Spectral CFD

    Ohshima Ryosuke, Miyaji Koji

    AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES   20 ( 0 )   1 - 8   2021.3  [Reviewed]

    DOI CiNii

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES   Joint Work  

    <p>The time-spectral (TS) method to numerically predict self-excited oscillation due to the fluid dynamics-- rigid body dynamics coupling is developed and validated through the comparison with the time-marching (TM) method. A residual of the TS equation of motion of a rigid body is found to be a useful indicator to realize limit-cycle oscillations. It is minimized by repeating the frequency update by the Newton iteration, where the gradient of the residual with respect to the frequency is obtained from the flow simulation, and the displace update by solving the TS equation of motion. The developed method is validated by two problems: one is an oscillating cylinder due to the Karman vortex, and another is a transonic, pitching wing due to the movement of the shock wave around the wing. In both problems, the TS methods quantitatively reproduce free oscillations by the TM method. The simulation time is shortened by a factor of 4 for the transonic wing problem. </p>

    Other Link: https://ci.nii.ac.jp/naid/130008002176

  • Numerical Analysis of Aerodynamics and Flight Trajectory of JAXA's High-Mach Integrated Control Experiment (HIMICO)

    SAKAI Akifumi, MIYAJI Koji, HIROTANI Tomonari, SATO Tetsuya, TSUCHIYA Takeshi, TAGUCHI Hideyuki

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN   18 ( 1 )   1 - 7   2020.1  [Reviewed]

    DOI CiNii

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 日本航空宇宙学会   Joint Work  

    <p>The aerodynamic characteristics of a small-size hypersonic experimental aircraft called HIMICO are numerically simulated using CFD. A wide range of angles of attack and side-slip angles in Mach-5 flows are investigated, and the results are compared with wind-tunnel tests (WTT). Dynamic stability derivatives are also estimated using CFD. The flight trajectories are then calculated based on the aerodynamic coefficients obtained using CFD. The effects of aerodynamic damping due to the dynamic stability derivatives are large, especially on the attitude of the aircraft with an initial roll/yaw angle deviating from the nominal. Even so, the important criteria for the engine test are satisfied by both results under the assumed initial conditions. Validation of the simulation methods developed for designing hypersonic aircrafts was confirmed.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007779837

  • Evaluation of discontinuity treatment in intrusive polynomial chaos for uncertainty quantification of a nozzle flow in CFD

    MIYAJI Koji, INOUE Takumi

    Journal of Fluid Science and Technology   15 ( 1 )   JFST0002 - JFST0002   2020.1  [Reviewed]

    DOI CiNii

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:一般社団法人 日本機械学会   Joint Work  

    <p>Stochastic flow simulation methods based on the polynomial chaos expansion (PCE) are developed and verified to quantify the propagation of a geometric uncertainty of a quasi-one dimensional flow in a supersonic wind tunnel. The effect of uncertainty in the area of diffuser throat, i.e. second throat, on the wind tunnel starting problem is focused on, where a slight change in the area can cause a large jump of the shock wave resulting in a breakdown of the supersonic test conditions. Two major numerical techniques in our intrusive PCE are the multi-wavelet (MW) basis and the multi-element (ME) PCE, in order to properly deal with discontinuous responses of output variables, which are caused by the shock wave and its jump at started/unstarted mode change. Single-element spectral PCE using Legendre basis and the Haar-wavelet are also included as special cases of the MW, and the methods are all compared with Monte-Carlo Simulations (MCS) executed by the deterministic code. Response surfaces of the pressure by the employed PCEs qualitatively agree with the result of MCS except the spectral PCE. Furthermore, from quantitative evaluations by the probability density function (PDF) of the output on a rather complicated response surface with several discontinuities, the ME-PCE best agrees with the MCS at much lower computation costs.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007779301

  • 時間スペクトル法によるウィングロックのCFD解析

    宮路幸二,大島亮祐

    令和元年度航空宇宙空力シンポジウム   2020.1

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    Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Joint Work  

  • Non-Intrusive Uncertainty Quantification Method for Flows with Discontinuity

    Takumi Inoue, Koji Miyaji

    AIAA SciTech Forum and Exposition   2020.1  [Reviewed]

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    Language:English   Publishing type:Research paper (international conference proceedings)   Joint Work  

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Review Papers 【 display / non-display

  • 次世代超音速旅客機の空力性能数値シミュレーション

    日本流体力学会誌ながれ   21 ( 1 )   1 - 2   2002.2

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Single Work  

Grant-in-Aid for Scientific Research 【 display / non-display

  • 時間スペクトル法による高速数値計算を用いたフラッターの不確実性評価の研究

    2019.4

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

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    Grant type:Competitive

Other external funds procured 【 display / non-display

  • ラジエータファンまわりのCFD解析

    2008.4 - 2011.3

    Private Foundations 

    Investigator(s):宮路幸二

Preferred joint research theme 【 display / non-display

  • Aeroelastic numerical simulations

  • Numerical fluid simulations from incompressible flows to supersonic flows

Past of Collaboration and Commissioned Research 【 display / non-display

  • 近傍場圧力波形計測のための衝撃波/乱流境界層干渉に関する数値的研究

    Funded Research offered by Enterprises  

    Project Year: 2011.8  -  2012.3 

  • 熱交換器の伝熱促進(境界層制御)に関する研究

    Funded Research offered by Enterprises  

    Project Year: 2008.4  -  2011.3 

  • Prediction of the Performance of Turbo Charger

    Funded Research offered by Enterprises  

    Project Year: 2005.4  -  2009.3 

  • Aerodynamic Characteristics of External Apparatus of Aircraft

    Funded Research offered by Enterprises  

    Project Year: 2003.4  -  2004.3 

 

Charge of on-campus class subject 【 display / non-display

  • 2021   海洋空間実践演習

    Graduate school of Engineering Science

  • 2021   海洋宇宙システム工学海外特別研修

    Graduate school of Engineering Science

  • 2021   海洋宇宙システム工学学外演習

    Graduate school of Engineering Science

  • 2021   海洋空間システムデザイン演習D

    Graduate school of Engineering Science

  • 2021   海洋空間システムデザイン演習C

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display

  • 極超音速推進技術検討委員会

    2020.6 - 2021.3  委員

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    Committee type:Other 

  • Asia Pacific International Symposium on Aerospace Technology

    2017.4 - 2020.3 

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    Committee type:Academic society