Papers - Obi, Shinnosuke

日本流体力学会年会講演論文集= Proceedings,... meeting of Japan Society of Fluid Mechanics 2001, 449-450, 2001-07-01

高木玲， 市川正明， 益田重明， 小尾晋之介

Trans. ASME 116 (4), 842-847  1994

Calculation of the turbulent separating flow in an asymmetric plane diffuser by a second-moment closure model

Obi, S. Masuda, S.

5th Int. Symp. on Computational Fluid Dynamics    381-387 1993.09

Research paper (conference, symposium, etc.), Joint Work

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二次元非対称ディフューザ内乱流の数値予測における乱流モデル選択の重要性と、レイノルズ応力方程式モデルの有効性を示した。(6頁)

Experimental and computational study of turbulent separating flow in an asymmetric plane diffuser

Obi, S. Aoki, K. and Masuda, S.

Ninth Symp. on Turbulent Shear Flows    P305.1-P305.4 1993.08

Research paper (conference, symposium, etc.), Joint Work, Accepted

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二次元非対称ディフューザに発生するはく離乱流のレーザ計測を行い、レイノルズ応力モデルの適用を通じて乱流構造の変化を論じた。(4頁)

Finite-volume computation of merging parallel channel flows by a second-moment turbulence closure model

Obi, S., Masuda, S.

J. Wind Engineering and Industrial Aerodynamics Vol. 46,47 1993.06

Joint Work

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異なる速度をもって合流するチャネル乱流の混合特性についてレイノルズ応力方程式モデルによる数値解析を行い、予測性能について論じた。(10頁)

Prediction of strongly swirling flows in quarl expansions with a non-orthogonal finite-volume method and a second-moment turbulence closure

Wennerberg, D. and Obi, S.

2nd Int. Symp. on Engineering Turbulence Modelling and Measurements    197-206 1993.05

Research paper (conference, symposium, etc.), Joint Work, Accepted

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旋回及び再循環を伴なう複雑乱流の数値予測に関連して、様々な燃焼器流れにおけるレイノルズ応力方程式モデルの有効性を示した。(10頁)

Turbulent separation control in a plane asymmetric diffuser by periodic perturbation

Obi, S. Ohizumi, H. Aoki, K. and Masuda, S.

2nd Int. Symp. on Engineering Turbulence Modelling and Measurements    633-642 1993.05

Research paper (conference, symposium, etc.), Joint Work, Accepted

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非対称平面ディフューザ内乱流はく離の能動制御法に関し、周期的な外乱の強さと周波数の影響について系統的な実験を行った。(10頁)

周期的吸込み吹出しによる乱流はく離の制御

大泉博文， 小尾晋之介， 益田重明

日本機械学会論文集 B 編 59 (557), 123-128 59号 ( 557巻 )  1993.01

Research paper (conference, symposium, etc.), Joint Work

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二次元非対称ディフューザに発生するはく離を伴なう乱流場に周期的な撹乱を人工的に与え、流れの制御を行うための基礎データを提供した。(6頁)

Control of Turbulent Separation by Periodic Suction and Injection

Ooizumi H., Obi S., Masuda S.

Transactions of the Japan Society of Mechanical Engineers Series B (Transactions of the Japan Society of Mechanical Engineers Series B)  59 ( 557 ) 123 - 128 1993

ISSN  03875016

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Effects of periodic perturbation on the turbulent separating flows in a plane two-dimensional asymmetric diffuser have been experimentally investigated. The perturbation was accomplished by alternating injection and suction through a two-dimensional slit located upstream of the expected detachment point. The results indicate that the pressure recovery along the diffuser depends on the frequency as well as the amplitude of the injection/suction flow ; the maximum improvement was achieved at St∼0.03, the Strouhal number St being based on the channel width and channel center velocity at the inlet of the diffuser. The phase-averaged velocity distributions at each phase of the oscillation were evaluated by means of synchronized sampling of the velocity signal employing direction-sensible hot-wire anemometry. A wavy pattern of the instantaneous streamlines, obtained from the velocity profiles, extends throughout the entire region of the diffuser, confirming an enhanced momentum transport due to the organized oscillatory fluid motion. © 1993, The Japan Society of Mechanical Engineers. All rights reserved.

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正方形断面を有する二次元障害物周りの乱流数値解析

小尾晋之介

日本機械学会論文集 B 編 58 (555), 3305-3310 58巻 ( 555号 )  1992.11

Research paper (conference, symposium, etc.), Joint Work

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障害物周りの乱流場の解析における乱流モデルの重要性について述べ、簡易モデルに対するレイノルズ応力方程式モデルの優位性を示した。(6頁)

Finite-volume computation of merging parallel channel flows by a second-moment turbulence closure model

Obi, S. and Masuda, S.

First Int. Symp. on Computational Wind Engineering    225-230 1992.08

Research paper (conference, symposium, etc.), Joint Work, Accepted

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乱流混合領域の性質が混合流の速度比によって変化する様子を、種々の乱流モデルによる数値解析により明らかにした。(6頁)

Numerical Study on the Turbulent Flow around a Two-Dimensional Square-Sectioned Obstacle

Obi S., Perlc M., Scheuerer G.

Transactions of the Japan Society of Mechanical Engineers Series B (Transactions of the Japan Society of Mechanical Engineers Series B)  58 ( 555 ) 3305 - 3310 1992

ISSN  03875016

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The assessment of turbulence models including a second-moment closure and the standard k-ε model has been performed for calculating a turbulent separated flow over a surface mounted obstacle. The results indicate more complex characteristics in this problem compared to backward facing step flow which is often used as the test case of turbulence models. Although the required computational effort is much higher than that of the k-ε model, the superior performance of the second-moment closure model is evident in representing the velocity field immediately above the obstacle as well as the pressure variation along the channel. It is indicated that the shortcomings of the k-ε model are attributable to the erroneous behaviour of the production rate of turbulent kinetic energy as calculated according to the eddy viscosity assumption. © 1992, The Japan Society of Mechanical Engineers. All rights reserved.

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A co-located finite-volume method for non-orthogonal grids with a second-moment turbulence closure

Obi, S. and Peric, M.

Proceedings of 4th Int. Symp. on Computational Fluid Dynamics  1991.09

Research paper (conference, symposium, etc.), Joint Work, Accepted

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非直交格子系におけるレイノルズ応力方程式モデルの適用のための有限体積法を考案し、様々な流れ場の解析を通じて検証を行った。(6頁)

Second-moment calculation procedure for turbulent flows with collocated variable arrangement

Obi, S., Peric, M., Scheuerer, G.

AIAA Journal (AIAA Journal)  Vol. 29 ( 4 ) 585 - 590 1991.04

Joint Work,  ISSN  00011452

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レイノルズ応力方程式モデルを複雑乱流に適用する際に問題となる数値解析的不安定性を解消するスキームを開発し、その検証を行った。(6頁)

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Finite-volume computation of the flow over a square rib using a second-moment turbulence closure

Obi, S. Peric, M. and Scheuerer, G.

Engineering Turbulence Modelling and Experiments    185-194 1990.09

Research paper (conference, symposium, etc.), Joint Work, Accepted

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二次元の障害物周りのはく離乱流の解析にレイノルズ応力方程式モデルの適用を行い、単純なモデルに対する優位性を示した。(10頁)

A finite-volume calculation procedure for turbulent flows with second-order closure and colocated variable arrangement

Obi, S. Peric, M. and Scheuerer, G.

Seventh Symp. on turbulent Shear Flows    17.4.1-17.4.6 1989.08

Research paper (conference, symposium, etc.), Joint Work, Accepted

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レイノルズ応力方程式モデルによる複雑乱流の数値解析のために効果的なスキームを開発し、バックステップ流れの解析により性能評価をした。(6頁)

Finite volume calculation of a high Reynolds number backward facing step flow employing a colocated variable arrangement

Obi, S., Peric, M., Scheuerer, G.

Transport Phenomena in Turbulent Flows, Theory, Experiment and Numerical Simulation  1988.10

Joint Work

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乱流の数値解析におけるモデルの性能評価のために数値解析的な誤差を系統的な方法で評価するための指針を示した。(15頁)

Heat transfer characteristics from a flat plate to a gas-solid two-phase flow downstream of a slit injection

Obi, S., Hishida, K., Maeda, M.

Trans ASME, J. Heat Transfer (Journal of Heat Transfer)  Vol. 110 ( 3 ) 687 - 694 1988.08

Joint Work,  ISSN  00221481

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平板境界層に発達する固気混相流の境界層において、熱伝達特性と流れ場の性格及び固体粒子群の挙動との相関を実験的に解明した。(8頁)

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Experimental and computational investigation of the two-dimensional channel flow over two fences in tandem

Durst, F., Founti, M., Obi, S.

Trans ASME, J. Fluids Engineering, Vol. 110 1988.03

Joint Work

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流れ場に直列に置かれた2つの障害物周りに形成される再循環領域について、そのRe数への依存性を実験と数値解析により明らかにした。(7頁)

Finite volume calculations of a high Reynolds number backward facing step flow employing a colocated variable arrangement

Obi, S. Peric, M. and Scheuerer, G.

2nd Int. Symp. on Transport Phenomena in Turbulent flows    839-853 1987.10

Research paper (conference, symposium, etc.), Joint Work, Accepted

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高レイノルズ数の乱流場の数値予測における乱流モデルの性能評価を行うための数値解析的な誤差の定量化について指針を示した。(15頁)

Experimental and computational investigation of the two-dimensional channel flow over two fences in tandem

Durst, F. Founti, M. and Obi, S.

3rd Int. Symposium on Application of Laser Anemometry to Fluid Mechanics  1986.07

Research paper (conference, symposium, etc.), Joint Work, Accepted

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チャネル内の連続する障害物を乗り越える流動場についてレーザ計測を行い、さらに数値解析結果との比較を通じてその性格を明らかにした。(7頁)