研究者業績
基本情報
- 所属
- 成蹊大学 理工学部 理工学科 教授
- 学位
- 博士(工学)(東京大学)工学修士(東京工業大学)
- J-GLOBAL ID
- 200901055183296938
- researchmap会員ID
- 1000361406
- 外部リンク
研究キーワード
2経歴
8-
2020年4月 - 現在
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2007年4月 - 現在
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2024年4月 - 2026年3月
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2013年4月 - 2018年3月
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2001年4月 - 2007年3月
学歴
4-
- 1998年
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- 1998年
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- 1990年
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- 1990年
受賞
3-
1999年
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1994年
論文
12-
Journal of Fluid Science and Technology 17(4) 1-15 2022年11月 査読有り
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Volume 2: Fluid Applications and Systems; Fluid Measurement and Instrumentation 2021年8月10日<title>Abstract</title> The present study investigates the flow field in a rinsing process of a beverage can numerically and experimentally. The three-dimensional Navier-Stokes equations are solved with a finite volume method along with the volume of fluid (VOF) method for free surface. The beverage can set upside down is transported with a constant velocity and rinsed with a water jet ejected from a nozzle below the can. The case of a can at rest is also simulated. The result shows that the ejected water impinges on the can bottom and spreads along the side surface of the can. Then, as it flows down toward the can mouth, its front surface forms splashes. For the stationary can case, after the jet impinges on the can bottom, it almost evenly spreads over the side surface. The water flows downward and becomes branched flows by fingering. The time average of VOF is calculated to visualize the regions rinsed by water. For the case of a moving can, only the top region of the can is rinsed, and the ratio of the rinsed region drops to 29% from 69% for the stationary case. The computed water surfaces qualitatively agree with the experimental result, but the shape of the front surface, such as splashes and fingerings, cannot be resolved with the simulation.
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Volume 2: Fluid Applications and Systems; Fluid Measurement and Instrumentation 2021年8月10日<title>Abstract</title> Micro air vehicles (MAVs) have been developed for many fields. The MAVs usually receive strong impact from a velocity change in time or space, and facilities for aerodynamic experiments of MAVs under a gusty environment have been required. The present study has developed a gust wind tunnel to generate unsteady and non-uniform flows. We developed a small wind tunnel with eight multi-fans and a shutter mechanism at the upstream of the test section. We controlled the outputs of the fans independently and obtained a linear shear layer with an error of 5 percent. The velocity gradient of the shear layer was from 5 to 8 s−1. The shutter mechanisms provided a longitudinal gust with the velocity change from 2 m/s to 10 m/s within 0.3 seconds.
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Journal of Food Engineering 291 110237-110237 2021年2月 査読有り
MISC
64-
ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019 3A-2019 2019年 査読有りCopyright © 2019 ASME. Motion of liquid pouring from a beverage can is numerically studied. A liquid is poured from a can which is rotated at a prescribed angular speed. The flow is simulated by solving the unsteady three-dimensional Navier-Stokes equations. An experiment under the same condition is also carried out to validate the computational result. The result shows that, when the can is tipped, the liquid flows over the lid of the can and is once obstructed by the rim of the lid. The numerical result is in good agreement with the experimental result. The effect of condensation formed on a can surface is also considered. The effect of condensation is taken into account by adjusting a contact angle. The liquid pouring from a can trickles down along the can body. The computation reproduces these experimental observations.
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ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019 3A-2019 2019年 査読有りCopyright © 2019 ASME. A tube-type gas burner consists of a straight tube with a slit along it and discharges an air-gas mixture through the slit to produce a flame. The flow velocity from the slit depends on the pressure in the tube and the pressure loss at the slit, and it varies in the longitudinal direction of the tube. The resulting uneven flame degrades the quality of the burner. In this study, we develop a one-dimensional theoretical model of the flow in a tube with a slit. To validate the result of the theoretical model, we also conduct experiments and numerical simulations for the same flow field. We applied this theoretical model to a flow in a tube, 1 m length, 40 mm in diameter, with a slit 2.5 mm wide. The end of the tube is closed. We also discuss the effect of the length of the burner on the unevenness.
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日本機械学會論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B 70(700) 3082-3089 2004年12月25日The near pressue field formed around a high speed train causes a vibration problem such as window rattling in the railside residential area. This paper investigates the near pressure field around a train using the potential theory. A train is modeled with the source distribution and the distance attenuation of the pressure field is obtained theoretically. The result shows that the pressure field away from a track only depends on the cross sectional area of a train, and that the pressure variation away from the track can not be weaken by designing the train shape.
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Proceedings of Internoise 2003年
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Proceedings of ASME/JSME Joint Fluids Engineering Conference 2003年
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Proceedings of WAVE2002 2002年
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Proceedings of the Forum Acusticum 2002 2002年
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Proceedings of Parallel CFD 2002 2002年
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Proceedings of the 2nd International Computational Fluid Dynamics 15 127-127 2002年
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1st International Conference on Computational Fluid Dynamics 2000年
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Lecture Notes in Physics in press 2000年
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JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS 81 377-389 1999年5月A new flow solver is developed for wind environment assessment in which a very complex flow held over a number of buildings should be taken into account. The adaptive Cartesian mesh algorithm is used so as to automatically generate meshes for complicated flow geometry. In this approach, a flow field is decomposed into a number of cubic cells and a cell is recursively divided into eight children cells where curvature of flow geometry or gradient of flow variables are large. The numerical scheme is based on the artificial compressibility method and the finite volume method is used for discretization, The cells are organized with the tree data structure and the numerical algorithm for the tree data structure is described. Computational results are presented and the efficiency of the algorithm is discussed, (C) 1999 Elsevier Science Ltd. All rights reserved.
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International Workshop on CFD for Wind Climate in Cities 1998年
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Frontiers of Computational Fluid Dynamics, World Scientific 395-416 1998年
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Proc. R. Soc. Lond 454(1976) 2083-2112 1998年
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COMPUTERS & FLUIDS 26(6) 565-585 1997年7月A three-dimensional flow induced by a practical high-speed train moving into a tunnel is studied by the computation of the compressible Navier-Stokes equations with the zonal method. The transient flow field induced by tunnel entry is investigated with the focus on the compression wave which is the source of the booming noise at the tunnel exit. The results reveal a pressure increase inside the tunnel before tunnel entry, the one-dimensionality of the compression wave, the histories of the aerodynamic forces, etc. The computed pressure histories inside the tunnel agree with the field measurement data. The how fields are also computed for cases where the train runs on differently positioned tracks into the tunnel. The results indicate that the wavefront of the compression wave is affected by the train position and this phenomenon is explained by the parameter v(wall). (C) 1997 Elsevier Science Ltd.
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日本機械学会論文集 62(599) 2679-2686 1996年In this work, we developed a theoretical algorithm to design a train shape for alleviating the booming noise caused by a train moving into a tunnel. In past studies, the authors clarified that the strength of the booming noise is proportional to υwall which is defined as a lateral velocity component at the height of a tunnel wall in a steady flow field around a train. υwall is theoretically obtained as a function of a train shape with the small perturbation theory. With these relations, a train shape is theoretically designed so as to minimize υwall. This algorithm is applied to an axisymmetric flow under practical high speed conditions. The optimized train shape is obtained in a very short CPU time and the strength of the booming noise is reduced by about 20%. The efficiency of the optimized shape is verified by an unsteady numerical simulation of the flow field of the train moving into the tunnel. The results indicate that this algorithm can be an efficient method for designing a train shape that alleviate the booming noise.
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COMPUTATIONAL FLUID DYNAMICS '96 808-814 1996年A high-speed train moving into a tunnel creates a compression wave which causes a booming noise at the tunnel exit. In the present paper, this compression Nave is studied both numerically and analytically with the emphasis of prediction and alleviation of the booming noise. Three dimensional practical flow fields where a train moves into a tunnel is solved numerically with the tend method, The computational results are validated with the field measurement data and the detail of the flow field is investigated. In the analytical approach, the flow field is modeled as a stream tube and the hey parameter which dominates the compression wave is derived, Based on the result, new method for prediction and alleviation of the booming noise is proposed.
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COMPUTERS & FLUIDS 24(8) 897-906 1995年11月A three-dimensional how field induced by two trains passing by each other inside a tunnel is studied based on the numerical simulation of the three-dimensional compressible Euler/Navier-Stokes equations formulated in the finite difference approximation. A domain decomposition method with the FSA (fortified solution algorithm) interface scheme is used to treat this moving-body problem. The computed results show the basic characteristics of the flow field created when two trains pass by each other. The history of the pressure distributions and the aerodynamic forces acting on the trains are the main areas discussed. The results indicate that the phenomenon is complicated due to the interaction of the flow induced by the two trains. Strong side forces occur between the two trains when the front portion of the opposite train passes by. The forces fluctuate rapidly and the maximum suction force occurs when two trains are aligned side by side. The results also indicate the effectiveness of the present numerical method calculating moving boundary problems.
書籍等出版物
2Works(作品等)
6共同研究・競争的資金等の研究課題
11-
日本学術振興会 科学研究費助成事業 2009年 - 2011年
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日本学術振興会 科学研究費助成事業 2004年 - 2006年
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日本学術振興会 科学研究費助成事業 2002年 - 2003年
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