Search Results 1-20 of 8213

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

    Dang Nannan , Zhang Jiazhong , Deguchi Yoshihiro

    … The simulation considers the reacting flow, flame dynamics, and radiation model to investigate the important physical processes. … A finite volume-based approach is used to simulate reacting flows under both laminar and turbulent flow conditions. …

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


  • Unsteady Flow Simulation Around 30P30N High-Lift Airfoil with Immersed Boundary Method on Hierarchical Cartesian Grid  [in Japanese]

    菅谷 圭祐 , 今村 太郎 , SUGAYA Keisuke , IMAMURA Taro

    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: AA2030013019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), 143-147, 2021-02-08


  • Introduction of Multi-fan Unsteady Flow Wind Tunnel  [in Japanese]

    飯田 有未 , 染川 大輔

    JWE = 日本風工学会誌 : journal of wind engineering, JAWE : wind engineers, JAWE 46(1), 40-44, 2021-01

  • Characteristics of Unsteady Flow Wind Tunnel for OWC Wave Turbine  [in Japanese]

    石山 拓也 , 中村 祐之 , 黒川 由美 , 奥村 哲也 , 濱川 洋充 , 林 秀千人

    … In this study, the oscillating water column type is considered that the oscillating air flow produced by the wave drives the bi-directional turbine. … It needs the test equipment to check the performance of the turbine in oscillating flow. … We have developed a wind tunnel for the oscillating air flow test of turbine that can easily generate an oscillating flow at an arbitrary period. … It is easily generated a short cycle oscillating flow. …

    長崎大学大学院工学研究科研究報告 = Reports of Graduate School of Engineering, Nagasaki University 51(96), 1-6, 2021-01


  • Effect of pulsatile flow to drag of a two-dimensional bluff body  [in Japanese]

    ISERI Kouki , GOIT Jay Prakash , KAMEDA Takatsugu

    … <p>Drag and velocity measurement on a two-dimensional bluff body has been performed in a pulsatile flow. … The pulsation period of the flow was set in the range of <i>T</i> … The cycle-averaged drag coefficient increases with the root mean value of the deviation from the cycle-averaged velocity of approaching flow to the cylinder. … <3.0× 10<sup>3</sup>) increases compared with that estimated from the drag coefficient in the steady flow. …

    Transactions of the JSME (in Japanese) 87(895), 20-00427-20-00427, 2021


  • Numerical Analysis of Fillet Shape and Molten Filler Flow during Brazing in the Al–Si Alloy of Automotive Radiator

    Tanaka Hirokazu

    … <p>In the brazing process of an automobile radiator, eutectic melting of the Al–Si filler alloy of the clad sheets, fillet formation in the brazed joints, and the flow of the molten filler metal on the solid core metal between joints occur continuously. … With regard to designing heat exchangers, the optimum placement of the filler metal, considering the flow of the molten filler metal, is an important subject. …

    MATERIALS TRANSACTIONS 62(4), 498-504, 2021


  • Unsteady behavior and mechanism of a rotating stall in a centrifugal compressor with vaneless diffuser  [in Japanese]

    FUJISAWA Nobumichi , MIIDA Hiroshi , TAJIMA Kenta , OHTA Yutaka

    … <p>Unsteady diffuser stall behavior in a centrifugal compressor with a vaneless diffuser was investigated by experimental and computational analyses. … The diffuser stall generated as the mass flow rate decreased. … According to the CFD analysis, the mass flow fluctuations at the diffuser exit showed a low mass flow region, rotating at approximately 25% of the impeller rotational speed. …

    Transactions of the JSME (in Japanese) 87(894), 20-00364-20-00364, 2021


  • Estimation of flow around a cylinder in a duct based on plane measurement by four-dimensional variational approach  [in Japanese]

    HOSOYA Taichi , KAMETANI Yukinori , OSAWA Takayuki , TSUKAHARA Takahiro , HASEGAWA Yosuke

    <p>本研究では,円柱を含むダクト内の空間発達流に対して4次元変分法を適用し,円柱下流の2次元面内における限られた計測データに基づき,円柱周りの非定常三次元流れの再現を試みた.初期場と流体内部に仮定した体積力を制御変数として,推定値と計測値の誤差を最小化するように,上記の制御変数の最適化を行った.推定された流れ場は,計測領域を含む2次元面内においては,計測領域の外側においても正解場を精 …

    SEISAN KENKYU 73(1), 77-81, 2021


  • Bayesian inference of environmental pollutant source in urban environment using adjoint equation simulated by LES  [in Japanese]

    JIA Hongyuan , KIKUMOTO Hideki

    <p>本研究では,LES(large-eddy simulation)による随伴濃度解析とベイズ推定を組み合わせた空気汚染物質の発生源同定手法を提案した.市街地立方体群モデルを用いた風洞拡散実験の計測濃度に基づいて同手法の有用性を検討した.発生源のパラメータを確率的に推定するため,測定された濃度と随伴濃度との差をベイズ定理に従って定式化した.また,LES の平均流れ場によって随伴濃度の …

    SEISAN KENKYU 73(1), 71-76, 2021


  • Effects of pressure and heat loss on the unstable motion of cellular-flame fronts caused by intrinsic instability in hydrogen-air lean premixed flames

    KADOWAKI Satoshi , Aung Thwe Thwe , FURUYAMA Taisei , KAWATA Kazumasa , KATSUMI Toshiyuki , KOBAYASHI Hideaki

    … Two-dimensional unsteady reactive flow was treated, and the compressibility, viscosity, heat conduction, molecular diffusion and heat loss were taken into account. …

    Journal of Thermal Science and Technology 16(2), JTST0021-JTST0021, 2021


  • Influence of the flow field structure formed downstream of the human vocal cord model on the sound generated  [in Japanese]

    KOSAKO Seiya , TSUNEYOSHI Tatsuya , TSUJI Yoshiyuki

    … The flow field downstream of the model was measured using PIV. … Then, the sound pressure was estimated by applying the Ffowcs Williams-Hawking equation to the measured flow field. … The main source of the generated sound was found to be the direct sound from an aerodynamic source in the downstream flow field of the model. …

    Transactions of the JSME (in Japanese) 87(893), 20-00255-20-00255, 2021


  • Simulating the flow around a train passing through a tornado

    Obara Kohei , Krajnović Siniša , Minelli Guglielmo , Basara Branislav , Okura Nobuyuki , Suzuki Masahiro

    … <p>A flow simulation was developed to understand the flow surrounding a train that was passing through a tornado and the resulting aerodynamic forces acting on the vehicle. … Unsteady Reynolds averaged Navier–Stokes equations were solved to reproduce a previously-conducted laboratory experiment, in which a model train runs through a stationary tornado-like swirling flow. …

    Journal of Advanced Simulation in Science and Engineering 8(1), 12-26, 2021


  • Nonlinearity of Circulation Flow Inside Torque Converter  [in Japanese]

    KUNISAKI Yasunori , MURATA Shigeru , TANAKA Yohsuke

    … The information on the frequency characteristic of the internal circulation flow can be useful in determining the cause of fluid noise and vibration problems in the torque converter. … In this paper, the internal flow field of an automotive torque converter is experimentally visualized, and the velocity field is measured using particle image velocimetry (PIV) in the cases of the speed ratio 0.1 and 0.7. …

    Journal of the Japanese Society for Experimental Mechanics 20(4), 281-287, 2021


  • Initially Solidified Shell Growth of Hypo-peritectic Carbon Steel in Continuous Casting Mold  [in Japanese]

    Mizukami Hideo , Shirai Yoshihisa , Hiraki Sei

    … <p>The occurrence of longitudinal surface cracks in hypo-peritectic carbon steel slabs depends largely on the cooling capacity of the mold and the flow velocity of molten steel below the meniscus. … The influence of both flow velocity of the molten steel below the meniscus and the heat flux in the copper mold were examined using continuous casting tests and numerical simulation of the molten steel flow. …

    Tetsu-to-Hagane 107(1), 53-63, 2021



    SUMIYOSHI Eisaku , HARASHIMA Hiroshi , ITO Kazuhide

    … Here, the flow field in the test chamber was assumed to be in the steady state. … Based on the steady air flow profile, non-steady state analyses of the emission and diffusion of ammonia in the chamber were analyzed. …

    Journal of Environmental Engineering (Transactions of AIJ) (778), 985-992, 2020-12


  • Unsteady Internal Flow and Loss Mechanism of a Turbocharger Turbine Under Pulsating Flow Condition  [in Japanese]

    中村 揚平 , 宮川 和芳

    ターボ機械 = Turbomachinery 48(11), 692-701, 2020-11

  • A Study on Implicit Time Integration Methods for Unsteady Flow Simulations  [in Japanese]

    松尾 裕一

    シミュレーション = Journal of the Japan Society for Simulation Technology 39(3), 191-196, 2020-09

  • Unsteady CFD Analysis on a Draft Tube Flow of Turbine  [in Japanese]

    松井 純

    ターボ機械 = Turbomachinery 48(9), 562-570, 2020-09

  • Unsteady Flow in a Multi-Stage Pump and LES Analysis  [in Japanese]

    渡邉 啓悦 , 渡邉 聡 , 山出 吉伸

    ターボ機械 = Turbomachinery 48(9), 532-544, 2020-09

  • Low Reynolds number turbulent flows over elastic walls

    Marco E. Rosti , Luca Brandt

    … We study the laminar and turbulent channel flow over a viscous hyper-elastic wall and show that it is possible to sustain an unsteady chaotic turbulent-like flow at any Reynolds number by properly choosing the wall elastic modulus. …

    Physics of Fluids 32(8), 083109, 2020-08-20


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