Details of a Researcher

Papers - MIYAJI Koji

about 82

Validations of flux reconstruction CFD on hybrid unstructured grids and application to low-Reynolds number transitional flow

Miyaji, K; Sekine, K

JOURNAL OF FLUID SCIENCE AND TECHNOLOGY 20 ( 1 ) JFST0001 - JFST0001 2025.2 [Reviewed]

DOI Web of Science CiNii Research

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

The flux reconstruction (FR) method, a high-order accurate solution method for unstructured grid CFD, is known as a method with a smaller computational load than the traditional discontinuous Galerkin method. It also contains other discrete spectral element methods by properly selecting the flux correction function. The 1D and tensor-product FR method is intuitively easy to understand, but the general-purpose automatic computational grid generation also requires tetrahedral, prism, and pyramid elements, which are not yet in general use for high-order CFD due to the complexity of their formulation and implementation. In this study, we extended an in-house FR CFD to hybrid elements, verified the accuracy in benchmark problems, and confirmed its applicability to low Reynolds number separated flows around an airfoil. The detailed formula for the pyramid are rarely found and they are elaborated in this study. For all types of elements mentioned above, we confirmed that the ideal accuracies (mesh convergence of errors) are achieved. For the application to a low-Reynolds-number transitional flows around an airfoil, the results well agreed with other high-order CFD results with more degrees of freedom.

The Proposal for the HIMICO Attitude and Orbit Control Subsystem Flight Test (HAOT)

SATO Tetsuya, TAGUCHI Hideyuki, TSUE Mitsuhiro, TSUCHIYA Takeshi, MATSUO Akiko, IMAMURA Shunsuke, T … Show more authors

Proceedings of Sounding Rocket Symposium 2024 2025.3

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

Prediction of atmospheric entry capsule wake flow using machine learning

1 - 7 2024.12

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

Development of Efficient Global Optimization Method Using the Kriging Model Applied to Wing Drag Minimization Problem

Van Cong Tai, Koji Miyaji, Yasumi Kawamura

Proceedings of the Fourth International Conference on Material, Machines, and Methods for Sustainable Development 2024.9 [Reviewed]

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

Development Status of the High Mach Integrated Control Experiment (HIMICO)

SATO Tetsuya, TAGUCHI Hideyuki, TSUE Mitsuhiro, TSUCHIYA Takeshi, MATSUO Akiko, IMAMURA Shunsuke, T … Show more authors

Proceedings of Sounding Rocket Symposium 2023 2024.2

CiNii Research

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

Study on the Effects of a Wing Dihedral for the Reduction of Sonic Boom Intensity

TSUDA Takuma, MIYAJI Koji

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 21 ( 0 ) 9 - 17 2023.1 [Reviewed]

DOI CiNii Research

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

The effects of a wing dihedral on sonic boom reduction are systematically studied for a realistic supersonic transport. The LM1021, which was designed in detail by Lockheed Martin Corporation (U.S.A.), is used as the baseline analysis model. The aerodynamic coefficients and near-field pressure signatures are obtained using CFD for inviscid flows, and then the sonic boom intensity on the ground is calculated with the pressure wave propagation analysis by solving the augmented Burger's equation. The ‘Xnoise’ code developed by JAXA is used for the wave propagation analysis. The results clearly show a reduction in the sonic boom intensity not only on the undertrack, but also on the off-track. One representative result is that the pressure peak of the tail boom at the flight Mach number of 1.6 is reduced more than 15% by a 10-deg dihedral compared to a 0-deg dihedral at the cost of a 2% increase in drag. Variations of the lateral/directional static stability are also studied, and the results show improved lateral stability while there are mild directional instabilities caused by the dihedral.

Study on the Application of Fast Linear Matrix Solvers for Enhanced Efficiencies of Wing Flutter Analysis

MIYAJI Koji, TAKEGAWA Hiroto, HAYASHI Kota

Transactions of the Japan Society for Computational Engineering and Science 2022 ( 0 ) 20220010 - 20220010 2022.8 [Reviewed]

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE Joint Work

This study enhances the efficiency and versatility of the flow simulations for moving and deforming bodies that are typically required for fluid-structured interactions such as flutter. Two of critically time-consuming processes are calculations of spatial grid deformations and nearest wall distances for the turbulence models. Both are formulated as elliptic boundary value problems, and the fast matrix solvers for the linear systems are developed and validated. One method is the flexible GMRES and another is the Residual Cutting Method (RCM). Two types of unstructured grids around practical aircraft model known as NASA Common Research Model (CRM) are used to test the developed method. Both GMRES and RCM are at least 4 times faster than the classical Gauss-Seidel method to achieve practical criteria of convergence. Errors of the nearest wall distance by the present method are within 5% except the portions of large curvature, and they have little effects on the flow simulations around CRM for a cruise condition without large-scale flow separations. Flutter simulations for a single wing are also carried out, and the results well predict the onset conditions of the flutter of the wind-tunnel experiment.

Prediction of transonic 2D wing flutter using the time-spectral computational fluid dynamics

Miyaji Koji, Takegawa Hiroto

JOURNAL OF FLUID SCIENCE AND TECHNOLOGY 17 ( 2 ) 1 - 13 2022.7 [Reviewed]

DOI Web of Science CiNii Research

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

A new computation method to predict a transonic wing flutter under the limit-cycle oscillation (LCO) is developed using the time spectral (TS) method. The fluid and structural unknowns at a specified time interval in one cycle of the flutter are obtained by steady-state solutions of the aeroelastic TS equations, and thus higher computational efficiency is expected. Determining the frequency is the key for the flutter prediction, and we propose a method of minimizing the residuals of the fluid equation. The time histories of the plunge and pitch are reconstructed by the discrete Fourier transform, and compared with the existing time marching (TM) method. The effects of the number of harmonics in the TS and the time-step size in the TM are examined for the detailed comparison. The frequency, amplitude, and phase differences between the structural vibration modes all well agree between the two methods for a wide range of flutter speed index. Complex flutter boundaries are also predicted. The TS method is faster to reach the LCO than the TM method for the first vibration mode of the flutter. It is slower for the second vibration mode, but the increase in the computation time is much smaller than the reduction in the first mode. In general, the TS method is particularly advantageous for the prediction near flutter boundaries and is useful for aircraft design.

Efficient Implicit Method for a High-Order Flux Reconstruction Approach Using Modified Matrix-Free Defect Correction

MIYAJI Koji, KOYAMA Hisato

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 20 ( 0 ) 16 - 25 2022.2 [Reviewed]

DOI CiNii Research

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

An efficient implicit time integration method for high-order CFD using the flux reconstruction (FR) approach is studied. The formulation is based on the method called matrix-free defect correction on sub-cells (DECS), which considerably reduces the computational cost of the preconditioned block LU-SGS (BLU-SGS). However, the present method uses the exact FR formulation for the simplified viscous terms in the left-hand-side Jacobian, and it does not explicitly use sub-cell divisions as a result of using the finite-difference formula. The performance of the proposed method is compared with BLU-SGS and DECS. Reductions of the computation time for the convergence are not remarkable, but the slightly improved stability and reduced memory storage suggest the present method as a reliable alternative to the existing methods.

Program of High Mach Integrated Control Experiment, “HIMICO” Using S-520 Sounding Rocket

SATO Tetsuya, TAGUCHI Hideyuki, KOJIMA Takayuki, TSUCHIYA Takeshi, TSUE Mitsuhiro, NAKAYA Shinji, M … Show more authors

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 19 ( 6 ) 831 - 837 2021.11 [Reviewed]

DOI CiNii Research

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

JAXA and some universities have proposed a hypersonic flight experiment named “HIMICO: High Mach Integrated Control Experiment” using a 1.5-meter class vehicle launched by the S-520 sounding rocket. The experiment aims to establish an integrated control method including the interference between the airframe and engine under the actual Mach 5 flight condition. Two flight experiments are planned step by step to reduce technical risks. Feasibility studies have been conducted by experiments and CFD analysis. This paper reports the summary of the flight test plan and preliminary studies on the vehicle shape, flight trajectory, component design and technical issues.

Prediction of Aeroelastic limit cycle oscillation by the time spectral CFD

Hiroto Takegawa, Koji Miyaji

2021 Asia-Pacific International Symposium on Aerospace Technology 2021.11

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

Study on the Effect of Dihedral for the Reduction of the Sonic-boom Intensity

Takuma Tsuda, Koji Miyaji

2021 Asia-Pacific International Symposium on Aerospace Technology 2021.11

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

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 Research

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

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.

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 Research

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

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.

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

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

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.

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

Non-Intrusive Uncertainty Quantification Method for Flows with Discontinuity

Takumi Inoue, Koji Miyaji

AIAA SciTech Forum and Exposition 2020.1 [Reviewed]

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

Numerical Simulations of Free-to-Roll Wing Rock Phenomena by the Time Spectral CFD

Ryosuke Ohshima, Koji Miyaji

AIAA SciTech Forum and Exposition 2020.1 [Reviewed]

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

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

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

Non-Intrusive Uncertainty Quantification Method for Flows with Discontinuity

Inoue, T; Miyaji, K

AIAA SCITECH 2020 FORUM 2020

Web of Science

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Numerical Simulations of Free-to-Roll Wing Rock Phenomena by the Time Spectral CFD

Ohshima, R; Miyaji, K

AIAA SCITECH 2020 FORUM 2020

Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Prediction of Aircraft Dynamic Stability Derivatives Using Time-Spectral Computational Fluid Dynamics

Miyaji Koji, Yoshida Yu

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 62 ( 6 ) 291 - 298 2019.11 [Reviewed]

DOI Web of Science

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

In this study, the dynamic stability derivatives of an aircraft model are calculated using CFD for the forced-pitch oscillation. The time-spectral, or reduced-frequency, method has been developed for RANS simulations on unstructured grids. It achieves faster computations than the time-marching method for periodically unsteady flows. The efficiency and accuracy of the method are first validated through comparisons with the transonic experiment of a pitching LANN wing. Next, the longitudinal dynamic-stability derivatives of a simplified aircraft model are calculated. Dependency of the damping-in-pitch and oscillatory longitudinal stability on the Mach number agreed reasonably well with the experimental results. Both the instantaneous flow field and frequency characteristics obtained directly from the time-spectral results are discussed to determine the effect of Mach number on the stability derivatives.

Other Link： https://ci.nii.ac.jp/naid/130007741729

CFDによる極超音速統合制御実験機の空力特性評価の研究

酒井瑛史，宮路幸二，廣谷智成，田口秀之，佐藤哲也，土屋武司

第51回流体力学講演会／第37回航空宇宙数値シミュレーション技術シンポジウム 2019.7

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

Program of High Mach Integrated Control Experiment “HIMICO” using S-520 Sounding Rocket,

T. Sato, H. Taguchi, T. Kojima, T. Tsuchiya, M. Tsue, S. Nakaya, A. Matsuo, A. Tezuka, T. Fujikawa, … Show more authors

Proc. 32nd International Symposium on Space Technology and Science 2019.6

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Space Technology and Science Joint Work

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

A. Sakai, K. Miyaji, T. Sato, T. Tsuchiya and H. Taguchi

Proc. 32nd International Symposium on Space Technology and Science 2019.6

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Space Technology and Science Single Work

Stability of Split-Form Flux-Reconstruction Schemes for Airfoil Flow Simulation with High-Order Mesh

T. Watanabe, Y. Abe, T. Haga, R. Takaki, A. Oyama,T. Nonomura and K. Miyaji

ICCFD10-207 2018.7

Language：English Publishing type：Research paper (scientific journal) Joint Work

Treatment of Discontinuity in Intrusive Polynomial Chaos for Uncertainty Quantification of a Nozzle Flow in CFD

K. Miyaji, T. Inoue

2018 Asia-Pacific International Symposium on Aerospace Technology 2018.6

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

Stable, non-dissipative, and conservative flux-reconstruction schemes in split forms

Yoshiaki Abe, Issei Morinaka, Takanori Haga, Taku Nonomura, Hisaichi Shibata, Koji Miyaji

Journal of Computational Physics 353 193 - 227 2018.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ACADEMIC PRESS INC ELSEVIER SCIENCE Joint Work

Report on APISAT-2017 in Seoul

MIYAJI Koji

Aeronautical and Space Sciences Japan 66 ( 10 ) 321 - 322 2018

DOI

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

Other Link： https://ci.nii.ac.jp/naid/130007496161

Uncertainty Quantification of Quasi-1D Flow by Polynomial Chaos Expansion Using Wavelet Basis

Inoue Takumi, Miyaji Koji, Kawamura Yasumi

JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 66 ( 6 ) 159 - 166 2018

DOI

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

A new scheme for the polynomial chaos expansion (PCE) is developed and tested to quantify the propagation of the input uncertainty in CFD. The Haar wavelet is used as basis for the PCE instead of globally continuous, orthogonal polynomials to properly represent the strong discontinuity such as a shock wave. We further extended the method to inputs with arbitrary probability distribution functions (PDF), although the natural application of the Haar wavelet is the uniform PDF. A transonic nozzle flow with an uncertainty in the nozzle-exit pressure is simulated. The wavelet basis well reproduces the Monte Carlo simulations at a single execution of the program, unlike the multi-element (ME) PCE developed in the previous report. But the quantitative agreements of the statistics are better obtained by the result using ME-PCE.

Other Link： https://ci.nii.ac.jp/naid/130007534694

RANS Simulations of NASA-CRM by the Finite-volume Method with the SST Turbulence Model

NAKAMURA Kazuaki,MIYAJI Koji

2017.11 [Reviewed]

DOI

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Aeronautical and Space Sciences Joint Work

Other Link： https://www.jstage.jst.go.jp/article/astj/advpub/0/advpub_JSASS-D-17-00060/_article/-char/ja/

Uncertainty Quantification of Transonic Nozzle Flow by Polynomial Chaos Expansion

MIYAJI Koji,UENO Tota,KAWAMURA Yasumi

Journal of the Japan Society for Aeronautical and Space Sciences 65 ( 4 ) 151 - 156 2017.8 [Reviewed]

DOI

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Aeronautical and Space Sciences Joint Work

Other Link： https://www.jstage.jst.go.jp/article/jjsass/65/4/65_65_151/_article/-char/ja/

時間スペクトル法による周期的非定常流れの効率的数値解法の研究

谷一慶亮，宮路幸二

日本航空宇宙学会論文集 65 ( 2 ) 73 - 81 2017.4 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本航空宇宙学会 Joint Work

Extension of the Flux Reconstruction Method to High-Reynolds Number RANS Simulations around High-Lift Devices

Transactions of the Japan Society for Aeronautical and Space Sciences 60 ( 1 ) 18 - 26 2017.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Aeronautical and Space Sciences Joint Work

Conservation Properties of High-order Flux Reconstruction Scheme in Split Forms

Issei Morinaka, Yoshiaki Abe, Takanori Haga, Taku Nonomura, Koji Miyaji

VII European Community on Computational Methods in Applied Sciences and Engineering 2016.6

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

Numerical Simulation of Transitional Flow Past a Wing Using Flux Reconstruction Method

Vilem Skarolek, Koji Miyaji

AIAA Journal 54 ( 4 ) 1424 - 1437 2016.3 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：American Institute of Aeronautics and Astronautics Joint Work

Study on Numerical Analysis of the Aerodynamic Characteristics and the Flight Trajectory of Balloon-based Operation Vehicle

Kao Ito, Koji Miyaji,Yasumi Kawamura, Yusuke Maru, Kazuhisa Fujita, Shujiro Sawai

The 2015 Asia-Pacific International Symposium on Aerospace Technology 2015.11

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

Study on Two-dimensional Wing Flutter Analysis by a High-order Flux Reconstruction Method

Issei Morinaka, Koji Miyaji

Procedia Engineering 99 543 - 550 2015.2 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

Detached-Eddy Simulations of Synthetic Jets for High-Angles-of-Attack Airfoils

Yuichi Ishibashi, Koji Miyaji

Journal of Aircraft 52 ( 1 ) 168 - 175 2015.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

An Efficient Correction Procedure via Reconstruction for Simulation of Viscous Flow on Moving and Deforming Domain

Chunlei Liang, Koji Miyaji, Bin Zhang

Journal of Computational Physics 256 55 - 68 2014.1 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Transitional Flow over a SD7003 Wing Using Flux Reconstruction Scheme

Vilem Skarolek, Koji Miyaji

AIAA-2014-0250 2014.1 [Reviewed]

DOI

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

Vortical Flow Simulations by a High-order Accurate Unstructured Hexahedral Grid Method

Koji Miyaji

Computers and Fluids 85 78 - 84 2013.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Single Work

Computational Analysis of Vortex Structures Induced by a Synthetic Jet to Control Separated Flows

Koichi Okada, Taku Nonomura, Kozo Fujii, Koji Miyaji

International Journal of Flow Control 4 ( 1+2 ) 47 - 66 2012.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Single Work

Computational Study of Effects of Nondimensional Parameters on Synthetic Jets

Koichi Okada, Akira Oyama, Kozo Fujii, Koji Miyaji

Transactions of the Japan Society for Aeronautical and Space Sciences 55 ( 1 ) 1 - 11 2012.1 [Reviewed]

Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Tail-Wing Flutter Analyses of a Balloon-based Operation Vehicle for Microgravity Experiments

Koji Miyaji, Kentaro Machida, Kazuhisa Fujita, Shujiro Sawai

Transactions of the Japan Society for Aeronautical and Space Sciences, 55 ( 6 ) 333 - 340 2012 [Reviewed]

Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Study on Comprehensive Flutter Characteristics of a Balloon-based Operation Vehicle for Supersonic Airbreathing Engine Experiment

Chihiro Yoshikawa, Koji Miyaji

ISTS 2011-e-11 2011.6 [Reviewed]

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

On the Compressible Flow Simulations with Shocks by a Flux Reconstruction Approach

Koji Miyaji

AIAA-2011-3057 2011.6 [Reviewed]

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

Computational Study of the Synthetic Jet on Separated Flow over a Backward-Facing Step

Koichi Okada, Kozo Fujii, Koji Miyaji, Akira Oyama, Taku Nonomura

IMECE2010-38767 2010.11

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

Computational Study on Effect of Synthetic Jet Design Parameters

Koichi Okada, Akira Oyama, Kozo Fujii, Koji Miyaji

International Journal of Aerospace Engineering 2010 2010.6 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.hindawi.com/journals/ijae/2010/364859.html

Flutter Analysis of Balloon-Based Operation Vehicle for Precooled Turbojet Engine Demonstration

Koji Miyaji,Junya Matsuwaki,Takayuki Kojima,Kazuhisa Fujita,Shujiro Sawai

AIAA-2010-55 2010.1 [Reviewed]

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

Computational Study of Frequency and Amplitude Effects on Separation Flow Control with the Synthetic Jet

Koichi Okada, Kozo Fujii, Koji Miyaji

IMECE2009-11218 2009.11 [Reviewed]

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

Computational Study of the Separated Flow Structure Induced by the Synthetic Jet on a Backward-facing Step

Koichi Okada, Kozo Fujii, Koji Miyaji

The 10th International Conference on Fluid Control, Measurements, and Visualization 2009.8 [Reviewed]

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

Effect of Grid Resolutions and Injectant Species in Computations of Supersonic Mixing

Koji Miyaji, Yoshiyuki Kitazume

AIAA-2009-3946 2009.6 [Reviewed]

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

Analyses of High-subsonic Wing Rock Phenomena by CFD

Y Takita, K Miyaji

Journal of the Japan Society for Aeronautical and Space Sciences 57 ( 664 ) 183 - 189 2009.5 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Aerodynamic Simulation of Flight Testbed of a Pre-cooled Turbojet Engine using a High-Altitude Balloon

Koji Miyaji, Taku Uchiyama,Kazuya Yamaguchi, Kazuhisa Fujita, Nobuyuki Tsuboi, Shujiro Sawa

JSASS-KSAS Joint International Symposium on Aerospace Engineering 2008.10 [Reviewed]

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

Effect of Internal Flows in the Synthetic Jet Cavity

Koichi Okada, Kozo Fujii, Koji Miyaji

The 5th International Conferences on Computational Fluid Dynamics 2008.7 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Aerodynamic Design of Balloon-Based Operation Vehicle for Precooled Turbojet Engine Demonstration

Kazuhisa Fujita, Nobuyuki Tsuboi, Shujiro Sawai, Hiroaki Kobayashi, Koji Miyaji, Taku Uchiyama

AIAA-2008-2658 2008.4 [Reviewed]

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

Analysis of High-subsonic Wing Rock Phenomena by Numerical Simulations

Yuichi Takita, Koji Miyaji

JSASS-KSAS Joint International Symposium on Aerospace Engineering, 2007, Kokura, Japan 2007.10 [Reviewed]

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

Precooled turbojet engine flight experiment using balloon-based operation vehicle

Kazuhisa Fujita, Shujiro Sawai, Hiroaki Kobayashi, Nobuyuki Tsuboi, Hideyuki Taguchi, Takayuki Koji … Show more authors

Acta Astronautica 59 ( 1-5 ) 263 - 270 2006.7 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

3D Wing Flutter Analysis by Bending-Torsion Beam Model and Unstructured CFD

Kentaro Machida, Koji Miyaji

005 JSASS-KSASS Joint International Symposium on Aerospace Engineering, Nagoya, Japan 2005.10 [Reviewed]

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

Comparisons Between Data-base and High-Resolution Simulations for Shock/Shock Interactions

Koji Miyaji

AIAA-2005-4641 2005.6 [Reviewed]

DOI

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

Numerical Analysis of the Aerodynamic Characteristics of SSTO Configurations with an Aerospike Nozzle

Harumi Tsukada, Keiichiro Fujimoto, Taku Nonomura, Koji Miyaji, Kozo Fujii

AIAA-2005-1043 2005.1 [Reviewed]

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

Numerical Simulation of a Free-to-Roll Wing Rock of a Delta Wing

Hirano Masataka, Miyaji Koji

Journal of the Japan Society for Aeronautical and Space Sciences 52 ( 611 ) 535 - 540 2004.12 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

On the Accuracy of Prediction of Flutter Boundary on Unstructured Grids

Koji Miyaji, Harumi Tsukada, Akira Tsurumaki

Transactions of the Japan Society for Aeronautical and Space Sciences 47 ( 157 ) 195 - 201 2004.11 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Numerical Analysis of Free-to-roll Wing Rock Motion by the Fluid Dynamics-Flight Dynamics Coumpling

Masataka Hirano, Koji Miyaji

ICAS 2004-2.2.1 2004.9 [Reviewed]

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

High-Order Compact Difference Scheme Applied to Double-Delta Wing Vortical Flows

ARASAWA T, FUJII K, MIYAJI K

Journal of Aircraft 41 ( 4 ) 953 - 957 2004.7 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Quantitative Analysis of Hypersonic Aerodynamic Heating Using Unstructured CFD Methods

Koji Miyaji, Tetsuya Furuta

ISTS 2004-e-38 2004.6 [Reviewed]

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

Grid Resolution Issues on the Supersonic Mixing Inside the Engine for Future Aerospace Vehicles

KITAZUME Y, MIYAJI K

ISTS 2004-a-06 2004.6 [Reviewed]

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

Unstructured Grid Simulations of Supersonic Mixing Using Ramp Injectors

KITAZUME Y, MIYAJI K

Asian Joint Conference on Propulsion and Power 2004 2004.3

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

Studies on High-Lift Devices for a Delta Wing Installed around a Trailing Edge

Koji Miyaji, Tomoyuki Arasawa

Journal of aircraft 40 ( 5 ) 932 - 937 2003.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Evaluation of a Landing Flying Boat on the Sea Development and Application of a High-Speed Experimental Guiding System

Tsugukiyo Hirayama, Koji Miyaji, Takehiko Tokayama, Yoshiaki Hirakawa, Tomonari Hayashi

Proceedings of the 7th International Conference on Fast Sea Transportation, Italy 2003.9 [Reviewed]

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

Application of High-Order Compact Difference Scheme to Vortical Flow Computation over a Delta and Double-Delta Wing

ARASAWA T, FUJII K, MIYAJI K

AIAA-2003-3537 2003.6 [Reviewed]

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

Application of High-Order Compact Difference Scheme to the Computations of Vortical Flows over a Double Delta Wing

ARASAWA T, FUJII K, MIYAJI K

International Sessions in Aircraft Symposium 2002 2002.10

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

WEB-CFD and Beyond - CFD for non-CFD Researchers

Fujii K, Miyaji K

AIAA-2002-0753 2002.1 [Reviewed]

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

Studies on High-Lift Devices for a Delta Wing Installed around a Trailing-Edge

Koji Miyaji, Tomoyuki Arasawa

AIAA-2001-2465 2001.6 [Reviewed]

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

Prediction of Hypersonic Shock/Shock Interaction Heating Using Hybrid Adaptive Unstructured Grids

Koji Miyaji

AIAA-2001-1751 2001.4 [Reviewed]

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

Numerical Analysis of Three-Dimensional Shock/Shock Interactions and the Aerodynamic Heating

Koji Miyaji, Kozo Fujii

37th AIAA Aerospace Sciences Meeting & Exhibit, Reno, Nevada, USA 1999.1 [Reviewed]

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

Unsteady Behavior of the Shock Wave Passing Over Two and Three Dimensional Obstacles

Koji Miyaji, Kozo Fujii

14th AIAA Applied Aerodynamics Conference, 1996.6 [Reviewed]

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

Simulations of Unsteady Shock Wave Reflections Using Adaptive Unstructured Grids

Koji Miyaji, Kozo Fujii

Lecture Notes in Physics, Springer, 15th International Conference on Numerical Methods in Fluid Dynamics, Monterey, CA, USA. 1996.6 [Reviewed]

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

Enhancement of the Leading-Edge Separation Vortices by the Trailing-Edge Lateral Blowing

Miyaji K, Fujii K

AIAA journal 34 ( 9 ) 1943 - 1945 1996 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Navier-Stokes Computations of the Flow Over the Delta Wing with Trailing-Edge Lateral Blowing

Koji Miyaji, Kozo Fujii, Keiichi Karashima

Proc. of 27th International Symposium on Advanced Transportation Applications, 1994.10 [Reviewed]

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

Enhancement of the Leading-Edge Separation Vortices by the Trailing-Edge Lateral Blowing

Koji Miyaji, Kozo Fujii, Keiichi Karashima

32nd AIAA Aerospace Sciences Meeting & Exhibit, Reno, Nevada, USA 1994.1 [Reviewed]

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

The Effect of a Spanwise Blowing on the Aerodynamic Characteristics of a Delta Wing

Koji Miyaji, Kozo Fujii, Keiichi Karashima

5th International Symposium on Computational Fluid Dynamics, Vol.Ⅱ, 1993.8 [Reviewed]

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

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Papers - MIYAJI Koji