Search Results 1-20 of 2797

  • Numerical Study on the Route of Flame-Induced Thermoacoustic Instability in a Rijke Burner

    Dang Nannan , Zhang Jiazhong , Deguchi Yoshihiro

    … The self-excited thermoacoustic instability in a two-dimensional Rijke-type burner with a center-stabilized premixed methane–air flame is numerically studied. … The simulation considers the reacting flow, flame dynamics, and radiation model to investigate the important physical processes. …

    Applied Sciences 11(4), 1590, 2021-02-10

    IR 

  • Side-Wall Effects on the Global Stability of Swept and Unswept Supercritical Wings at Buffet Conditions

    SANSICA Andrea , 橋本 敦 , 小池 俊輔 , 河内 俊憲 , SANSICA Andrea , HASHIMOTO Atsushi , KOIKE Shunsuke , KOCHI Toshinori

    流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン (2020年9月28日-30日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議)形態: カラー図版あり資料番号: AA2030013015レポート番号: JAXA-SP-20-008

    宇宙航空研究開発機構特別資料: 流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン論文集 = JAXA Special Publication: Proceedings of Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online (JAXA-SP-20-008), 109-118, 2021-02-08

    IR 

  • Basic Investigation on Noise Generation Due to Interactions between Aircraft Landing Gear Components and Gear Bay  [in Japanese]

    山本 一臣 , 梁 裕卓 , 村山 光宏 , 野崎 理 , 平井 亨 , YAMAMOTO Kazuomi , YAN Yutaku , MURAYAMA Mitsuhiro , NOZAKI Osamu , HIRAI Toru

    流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン (2020年9月28日-30日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議)形態: カラー図版あり資料番号: AA2030013025レポート番号: JAXA-SP-20-008

    宇宙航空研究開発機構特別資料: 流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン論文集 = JAXA Special Publication: Proceedings of Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online (JAXA-SP-20-008), 191-198, 2021-02-08

    IR 

  • Fuel Effects on the Combustion Flow Structure behind a Splitter Plate of a Rocket Injector

    MURAKAMI Shun , TERASHIMA Hiroshi , OSHIMA Nobuyuki

    … <p>A computational study is performed to investigate the impact of fuel sensitivity on a high-pressure combustion flow fields of a rocket-type injector through a comparison between two fuels, hydrogen and methane. … A two-dimensional model with a splitter plate, which represents a rocket engine injector, is adapted. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 19(2), 176-185, 2021

    J-STAGE 

  • BEM ANALYSIS OF LAMB WAVE SCATTERING BY LAYERED PLATE DEBONDING

    WONGTHONGSIRI Supawat , HIROSE Sohichi , WANG Bin

    … <p> This paper presents an analysis of reflection and transmission coefficients as boundary element solutions of guided Lamb wave scattering in a two-dimensional, isotropic, and linear elastic layered plate. …

    Journal of JSCE 9(1), 51-62, 2021

    J-STAGE 

  • Phase-field Simulation of Recrystallization in Cold Rolling and Subsequent Annealing of Pure Iron Exploiting EBSD Data of Cold-rolled Sheet

    Suwa Yoshihiro , Tomita Miho , Tanaka Yasuaki , Ushioda Kohsaku

    Numerical simulations of static recrystallization were performed in three-dimensional polycrystalline structures by coupling the unified subgrain growth theory with PF methodology. … To prepare the initial microstructures, two-dimensional electron back scattering diffraction (EBSD) measurements were carried out on 90% and 99.8% cold-rolled pure iron. …

    ISIJ International 61(1), 350-360, 2021

    J-STAGE 

  • Simulating the build shape for a shell structure for wire and arc additive manufacturing using the bead cross-section model

    ABE Takeyuki , SASAHARA Hiroyuki

    … In general, a computer-aided manufacturing (CAM) system is required not only to generate the deposition path as a numerical control data but also to estimate the shape of the build structure. … Therefore, in this study, a two-dimensional bead cross-section model was established, in which the bead accumulation was considered to fabricate a shell structure, and a build shell structure simulator was developed. …

    Journal of Advanced Mechanical Design, Systems, and Manufacturing 15(1), JAMDSM0001-JAMDSM0001, 2021

    J-STAGE 

  • Augmented phase reduction for periodic orbits near a homoclinic bifurcation and for relaxation oscillators

    Monga Bharat , Moehlis Jeff

    … The standard phase reduction, a model reduction technique based on isochrons, can be unsuitable for oscillators which have a small-magnitude negative nontrivial Floquet exponent. … This necessitates the use of the augmented phase reduction, a recently devised two-dimensional reduction technique based on isochrons and isostables. …

    Nonlinear Theory and Its Applications, IEICE 12(1), 103-116, 2021

    J-STAGE 

  • MEASUREMENT OF DISTRIBUTION OF TEMPERATURE AND MOISTURE CONTENT WITHIN WOODEN PLATE UNDER STEADY HEATING AND NUMERICAL REPRODUCTION WITH HEAT AND WATER TRANSFER ANALYSIS  [in Japanese]

    SUZUKI Tatsuro , NAMIKI Jun , HASEMI Yuji , TAKASE Ryo , KAMIKAWA Daisuke , YASUI Noboru , KAKU Chihiro

    … Located moisture content measurement systems calculated moisture content with electric resistance between two electrodes for each measurement point in specimens, and measurement range is most effective at 10~30 % moisture content. … Time variations of moisture content was differed from each specimen even at the same heat strength.</p><p> Temperature, moisture content, total pressure and vapor pressure were coupled and calculated by Crank-Nicolson method in the model for heat and water transfer. …

    Journal of Environmental Engineering (Transactions of AIJ) (778), 891-901, 2020-12

    J-STAGE  AIJ 

  • Energy redistribution and spatiotemporal evolution of correlations after a sudden quench of the Bose-Hubbard model

    Takasu Yosuke , Yagami Tomoya , Asaka Hiroto , Fukushima Yoshiaki , Nagao Kazuma , Goto Shimpei , Danshita Ippei , Takahashi Yoshiro

    非局所相関の伝搬の観測とエネルギー保存則の検証に成功 --冷却原子を用いた量子多体ダイナミクスの量子シミュレーション--. 京都大学プレスリリース. 2020-10-09.

    Science Advances 6(40), 2020-09-30

    IR 

  • Numerical and Experimental Study of Topographic Speed-Up Effects in Complex Terrain

    Uchida Takanori , Sugitani Kenichiro

    … In order to verify the prediction accuracy of RIAM-COMPACT, we conduct a wind tunnel experiment that uses a two-dimensional steep ridge model with a smooth surface. … The results of the numerical simulation by LES are in better agreement with the wind tunnel experiment using the split film probe than the results of the wind tunnel experiment using the I-type hot wire probe. …

    Energies 13(15), 3896-1-3896-38, 2020-07-30

    IR 

  • MULTIPHASE NUMERICAL SIMULATION ON LOCAL SCOUR AND PROTECTION BLOCKS DESTRUCTION BELOW GROUNDSILLS USING COUPLING METHOD OF E-MPS AND DEM  [in Japanese]

    樋口 敬芳 , 片山 直哉 , 斎藤 隆泰 , 清水 義彦

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 65, Ⅰ_973-978, 2020

  • Numerical Analysis on Gaseous Detonation with Dilute Polydisperse Water Spray  [in Japanese]

    WATANABE Hiroaki , MATSUO Akiko , CHINNAYYA Ashwin , MATSUOKA Ken , KAWASAKI Akira , KASAHARA Jiro

    … <p>Two-dimensional numerical simulations based on Eulerian-Lagrangian method are conducted to model a gaseous detonation laden with the polydisperse water spray in a two-dimensional straight channel. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J19107, 2020

    J-STAGE 

  • Attitude Control and Translational Position Control in Autonomous Flight System to Create Microgravity Space  [in Japanese]

    HIROI Ryohei , TATSUYA Shota , TAKEDA Masakazu , SUGAWARA Yoshiki

    … The study aims to design the control law considering propulsion force in two-dimensional model and to evaluate the proposed method by the result of numerical analysis.</p> …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J16205, 2020

    J-STAGE 

  • Numerical Analysis of Unsteady Phenomena of Cloud Cavitation by the Two-dimensional Smoothed Particle Hydrodynamics Method  [in Japanese]

    USHIOKU Takahiro , YOSHIMURA Hiroaki

    … Many numerical studies have been conducted so far to clarify such unsteady behaviors of the cloud, however it is not well understood how the inception of the cavitation cloud may be occurred and how its unsteady behavior can be elucidated in the context of the multiphase flows. …

    The Proceedings of Mechanical Engineering Congress, Japan 2020(0), J02409, 2020

    J-STAGE 

  • Analysis of the suspended flexible body's vibration behavior carried by overhead crane  [in Japanese]

    UEHARA Masaki , SUGAWARA Yoshiki , TAKEDA Masakazu

    … The control method is applied to the two-dimensional payload with two-point suspension, the influence of the control when the payload is flexible body is confirmed, and the control system is examined. … Since the rope length changes with time, the two-point suspended overhead crane model is represented by a linear time-varying system. …

    The Proceedings of the Dynamics & Design Conference 2020(0), 516, 2020

    J-STAGE 

  • Numerical analysis of two-dimensional flow in cloud cavitation by SPH method  [in Japanese]

    USHIOKU Takahiro , YOSHIMURA Hiroaki

    … On the other hand, it is not clear how such a cloud is rigorously (maybe mathematically or physically) defined nor how its collective motion can be elucidated in the context of the multiphase fluid flow, although some numerical studies have been already presented. …

    The Proceedings of Conference of Kanto Branch 2020(0), 17G14, 2020

    J-STAGE 

  • APPLICATION OF A DEEP-LEARNING METHOD INCLUDING SHORTCUT PATHS TO CORRECT THE PRECIPITATION OUTPUTS OF A NUMERICAL WEATHER PREDICTION MODEL  [in Japanese]

    KURAKAMI Takeru , SOUMA Kazuyoshi , MIYAMOTO Takashi , FURUYA Takahiko , MAGOME Jun , ISHIDAIRA Hiroshi

    <p> 本研究では,数値気象モデルによる降水量予測補正に,複数のショートカット接続を持つ深層畳み込みニューラルネットワーク(U-Net)を導入した.入力データについては2001年8月の京阪神地域における数値気象モデルの降水量と地上鉛直風速の出力を学習用,検証用に分割して用いた.通常の深層畳み込みニューラルネットワーク(CNN)を用いた場合と比較して,空間スケールの大きい(一つの降水域が …

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 76(5), I_471-I_478, 2020

    J-STAGE 

  • Two-dimensional ton transportation numerical simulation of anode cell of electrolyzed water generator  [in Japanese]

    KODAMA Manabu , TOSE Yoshihisa , OKUMURA Kazuhiko , HIRAI Shuichiro

    … However, there are still many unknowns about the internal phenomena of the electrolytic water production system, especially the two-dimensional phenomena that have a strong influence on the miniaturization, power saving, and longevity of the electrolyzed water generator. …

    Transactions of the JSME (in Japanese) 86(892), 20-00183-20-00183, 2020

    J-STAGE 

  • A Modification of Cartesian Cut-Cell Method for Incompressible Flows with Embed Boundaries

    Tanaka Sayuri , Shimada Naoki

    … <p>A numerical method based on cut-cell method was extended for turbulent flows in this study. … The function can be selected from some proposed wall function model. … In this study, the following two model were used: non-slip wall model and Allmaras wall model. …

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 53(12), 747-757, 2020

    J-STAGE 

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