Search Results 1-20 of 10368

  • 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


  • 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


  • From Quasi-static to Intermediate Regimes in Shear Cell Devices : Theory and Characterisation

    Francia Victor , Yahia Lyes Ait Ali , Ocone Raffaella , Ozel Ali

    Kona powder and particle journal = 粉 (38), 3-25, 2021


    KIM Haeyoung , FUJINO Yozo , KATSUCHI Hiroshi , SIRINGORINGO Dionysius Manly , YAMADA Hitoshi , OHKOSHI Shuji

    <p> 本研究は,まず,Large Eddy Simulation (LES)により橋桁上にある車両の周辺流を再現し,車両に対する空気力を求め,次に,その空気力を用いた車両の動力学的安定解析から横転,横滑り,ヨーイング現象の発生限界風速を求めている.その結果,1)車両周りの流れ場は,橋桁の端部から剥離するせん断流の影響を強く受け,車両の車線位置により流れ場が大きく変わり,そのため車両に …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 77(1), 107-120, 2021


  • Prediction of turbulent helicity and evaluation of Reynolds stress in the Ekman boundary layer  [in Japanese]

    KOYAMA Shoji

    <p>流体工学で用いられる典型的な乱流モデルである<i>k - ε</i><sub> </sub>モデルは,平均量を算出するに際し渦粘性係数を乱流エネルギー<i>k</i><sub> </sub>とその散逸率<i> ε</i><sub> </sub& …

    SEISAN KENKYU 73(1), 23-28, 2021


  • Computational Fluid Dynamics Analysis of Blood Flow Changes during the Growth of Saccular Abdominal Aortic Aneurysm  [in Japanese]

    Murakami Masanori , Jiang Fei , Kageyama Nobuyasu , Chen Xian

    <p>囊状腹部大動脈瘤の成長過程における数値流体力学解析を行った。CT画像を用い3次元形状モデルを作成。汎用熱流体解析ソフトウェアを用い壁面せん断応力,平均流速,平均圧力,エネルギー損失,圧力損失係数を計算した。瘤拡大に伴い平均流速は低下,壁面せん断応力,平均圧力,エネルギー損失,圧力損失係数は上昇した。壁面せん断応力は瘤径の小さい時点から上昇しており,動脈瘤の発生,成長に関与している …

    The Journal of Japanese College of Angiology 61(2), 3-10, 2021


  • Study of the Cavitation Phenomenon Inside Roller Vane Pump

    Zhang Bin , Zhao Chun-xiao , Hong Hao-cen , Bai Da-peng , Yang Hua-yong

    … The computational fluid dynamics simulation method (CFD) based on dynamic meshing technique and user defined function (UDF) is applied to calculate flow dynamics and multi-phase flow characteristics, especially the flows inside the fluid film between the stator and valve plate. … The simulated results show that the cavitation region is the same with the experiment one, and the cavitation inside the fluid film is caused by the shear action of the stator and valve plate. …

    International Journal of Fluid Machinery and Systems 14(1), 42-51, 2021


  • Measurements of the Reynolds stress in the turbulent premixed flame  [in Japanese]

    MAKITA Nobuhiro , SAITO Hiroshi , HASHIMOTO Hideki , FURUKAWA Junichi

    … <p>It has been shown in our previous study that the bi-modal distribution is seen in the radial component of the gas velocity obtained in the turbulent flame brush, implying that the shear component of the Reynolds stress conditioned on the unburnt mixture and burnt gas can be measured if the coincident measurement of the three components of the gas velocity is conducted. …

    Transactions of the JSME (in Japanese), 2021


  • A study on fundamental water lubrication characteristics of flat thrust bearing with partial water-repellent regions  [in Japanese]

    TAKEUCHI Akitoshi

    … In this bearing, water-repellent (slip) regions and hydrophilic (non-slip) regions were alternately arranged in the slip direction, and the pressure to support the load was generated by discontinuity of shear flow rate in both regions. … On bearing surfaces with large slip length, the shear flow rate increases and a high pressure is generated, resulting in a large load capacity. …

    Transactions of the JSME (in Japanese) 87(893), 20-00226-20-00226, 2021


  • Mechanism of aerodynamic force generation concerning train vibration in tunnel (LES of large-scale flow structure around simplified train model)  [in Japanese]

    NAKADE Koji , SAKUMA Yutaka , KAJISHIMA Takeo

    … <p>To clarify the mechanisms underlying airflow-induced vibrations of high-speed trains running through tunnels, large-eddy simulation of a large-scale flow structure around a simplified 6-car train model was conducted. … Thus, the air velocity is slower than that on both sides of the train, which generates shear flows near the bottom edges of both sides of the train. …

    Transactions of the JSME (in Japanese) 87(893), 20-00366-20-00366, 2021


  • An experimental study on the equilibrium boundary layer subjected to favourable pressure gradient (Effect of pressure gradient on law of the wall)  [in Japanese]

    HIKITA Yudai , SUZUKI Hiroki , KAMEDA Takatsugu , MOCHIZUKI Shinsuke

    … The wall shear stress was measured by three methods, which are direct measurement, Preston tube and Sublayer plate. …

    Transactions of the JSME (in Japanese), 2021


  • Recent Trends in Evaluation of Physical Properties of Foods:―Challenge for Numerical Evaluation of Swallowing―  [in Japanese]

    KAMIYA Tetsu

    … The bolus flow down and the velocity on the sheet was measured by the disruption signal of laser sensors. … Differences of physical quantities such as shear stress, energy density and diffusion area have been observed under the different viscosity, density samples. …



  • Development of a Hot-Wire Anemometer Probe Specializing in Measuring the Boundary Layer of a Circular Cylinder  [in Japanese]

    KENCHI Toshiaki , HONMURA Shinji , YAMADA Makoto , KAWAI Masahito

    … The boundary layer and velocity shear layer that develop around a circular cylinder placed in a flow have a significant effect on lift and drag depending on whether it is laminar or turbulent. … These shear layers are so thin that special measures are required for the experiment. … The frequency analysis showed that the separated laminar shear layer transitioned to turbulent flow near the boundary with the separated region.</p> …

    Journal of the Japanese Society for Experimental Mechanics 20(4), 265-271, 2021


  • How to detect eosinophil ETosis (EETosis) and extracellular traps

    Fukuchi Mineyo , Miyabe Yui , Furutani Chikako , Saga Tomoo , Moritoki Yuki , Yamada Takechiyo , Weller Peter F. , Ueki Shigeharu

    … EETs/EETosis can be observed using simple chemical or fluorescence staining, immunostaining, and electron microscopy, although it is noteworthy that visualization of EETs is greatly changed by sample preparation including the extracellular space of EETotic cells and shear flow. …

    Allergology International 70(1), 19-29, 2021


  • Pull-Out Performance of Eccentrically Spliced Longitudinal Headed Bars for Precast Beam-Footing Connections

    Ousalem Hassane , Takatsu Hiroto

    … To allow developing forces in longitudinal bars of beams flow to longitudinal bars of footings, a set of reinforcing ties is provided between them. … A method, based on the friction shear theory, for the strength evaluation of such arrangement is suggested.</p> …

    Journal of Advanced Concrete Technology 19(1), 1-13, 2021


  • Flow Corrosion Behavior of X100 Pipeline Steel in Simulated Formation Water

    LI Wensheng , FU Anqing , TIAN Yan , JU Yafeng , XUE Menghan , YIN Chengxian , ZHANG Qiuli

    … <p>The self-designed flow system was used to study the flow corrosion of X100 pipeline steel in simulated formation water environment by electrochemical measurements as well as computational fluid dynamics (CFD) simulation. … The effects of fluid flow velocity and fluid impact angle on X100 steel were determined. …

    Electrochemistry 89(1), 59-66, 2021


  • Formation mechanism of texture in α-alumina coatings produced by aerosol deposition

    HASEGAWA Makoto , KOMURO Masahiro , KIMURA Kyonosuke , HASHIMOTO Soma , TANAKA Makoto , KITAOKA Satoshi , KAGAWA Yutaka

    … The deposition rate increased with increasing gas flow rate when the gas flow rate was in the range from 6 to 30 L/min. Furthermore, the deposition rate increased with increasing substrate heating temperature. … Whether the nozzle angle was 90 and 60°, almost the same texture was formed indicating that the shear force does not contribute to texture formation. …

    Journal of the Ceramic Society of Japan 129(1), 7-16, 2021


  • An immersed boundary method for practical simulations of high-Reynolds number flows by <i>k-ε</i> RANS models

    YAO Hiroki , NAMBU Taisuke , MIZOBUCHI Yasuhiro

    … In the present paper, focusing on flow simulations using <i>k-ε</i> … To improve the evaluation of wall shear stress, the shear stresses on the boundaries of an IB cell are transformed into a body force acting on the adjacent fluid cell. …

    Journal of Fluid Science and Technology 16(1), JFST0007-JFST0007, 2021


  • The Synoptically-Influenced Extreme Precipitation Systems over Asian-Australian Monsoon Regio Observed by TRMM Precipitation Radar

    JIAN Hong-Wen , CHEN Wei-Ting , CHEN Peng-Jen , WU Chien-Ming , RASMUSSEN Kristen L.

    … The environment analysis shows that coast-related extremes in the warm season are found within the areas where high total water vapor and low-level vertical wind shear occur frequently. … With the enhancement of the low-level vertical wind shear and moisture by the synoptic flow, the coastal convection triggered diurnally has a higher chance to organize into mesoscale convective systems and hence a higher probability to produce extreme rainfall.</p> …

    Journal of the Meteorological Society of Japan. Ser. II, 2021


  • From Quasi-static to Intermediate Regimes in Shear Cell Devices: Theory and Characterisation

    Francia Victor , Ait Ali Yahia Lyes , Ocone Raffaella , Ozel Ali

    … Powders display a complex behaviour due to their ability to rearrange under stress, and as a result, granular flow is generally classified into three flow regimes, namely a quasi-static regime dominated by frictional contacts, an inertial regime dominated by collisional and kinematic stresses and an intermediate regime where the three sources of stress are important to establish a stress-strain rate relationship. …

    KONA Powder and Particle Journal, 2021


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