Faculty Profiles - YOSHIDA Keisuke

Papers - YOSHIDA Keisuke

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逆流風波開水路混成場における乱れ構造と気体輸送に関する実験的研究 Reviewed

禰津家久, 福谷彰, 吉田圭介, 垂井晃一

応用力学論文集 8 911 - 918 2005

TURBULENCE CHARACTERISTICS IN ADVERSE WIND-DRIVEN OPEN-CHANNEL FLOWS Reviewed

NEZU Iehisa, TARUI Kouichi, YOSHIDA Keisuke

Doboku Gakkai Ronbunshuu B 49 505 - 510 2005

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

This study describes an experimental investigation on turbulence characteristics and the water-surface fluctuations in adverse wind-driven open-channel flows by using both a laser Doppler Anemometer (LDA) and a wave gauge simultaneously. In this study, it was shown that the velocity fluctuations of water flow near the interface in not only cocurrent flow but also adverse flow are significantly affected by the water surface in every range of frequency. However turbulence characteristics in water layer in adverse wind-driven open-channel flows are different from those in cocurrent flow, and there exists a high correlation between turbulence and the surface fluctuations in predominant frequency due to high-sheared wind flow.

DOI： 10.2208/prohe.49.505

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Experimental study on air-water interfacial turbulent hydrodynamics and gas transfer in wind-induced open-channel flows Reviewed

Yoshida, K. and Nezu, I.

Proc.4th International Symposium on Environmental Hydraulics 185 - 191 2004.12

Numerical prediction of incompressible two-fluid system and its application to stratified flows with water and silicone-oil, Reviewed

K. Yoshida, S. Ushijima and I. Nezu

Proc. 14th APD-IHAR 309 - 309 2004.12

水面上に風シアーが存在する開水路流場における水層乱れ構造と水面変動に関する研究 Reviewed

禰津家久, 吉田圭介, 垂井晃一

水工学論文集 Vol.48 517 - 522 2004

風シアーを伴う開水路乱流場における水層組織渦構造に関する研究 Reviewed

吉田圭介, 禰津家久, 垂井晃一

応用力学論文集 Vol.7 1051 - 1060 2004

Fundamental study on air-water interfacial coherent structures in wind-induced water-waves flows by PIV measurements Reviewed

Nezu, I. and Yoshida, K.

Proc. 30th IAHR Congress C-1 235 - 242 2003.8

Computation of immiscible two-fluid flows with a unified numerical procedure Reviewed

Yoshida, K., Ushijima, S. and Nezu, I.

Proc. 30th IAHR Congress D 663 - 670 2003.8

FUNDAMENTAL STUDY ON AIR-WATER INTERFACIAL COHERENT STRUCTURES IN WIND-INDUCED WATER WAVES FLOWS BY PIV MEASUREMENTS Reviewed

NEZU Iehisa, YOSHIDA Keisuke, IKEDA Daisuke

Doboku Gakkai Ronbunshuu B Vol.47 457 - 462 2003

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

This paper describes an experimental study on turbulent bursting phenomena across air-water interface in wind-induced water waves by using Particle-Image Velocimetry (pry). The purpose of this study is to clarify coherent structures near the air-water interface in a wind-driven shear layer, and to evaluate an effect on momentum transport due to the busting events from the interfacial water to water-body flow. As the results of experiments, it is shown that the water flow is a combined flow with a wall shear flow and orbital motions, and that the wave-induced fluctuations have major power in the whole velocity fluctuations. In particular, when the bursting events are detected near the air-water interface by human eyes in the time-series of PIV raw images, only the low-frequency fluctuations are enhanced obviously at that time in wavelet-filter analysis. Therefore, it is inferred that the mechanism of water momentum transport is organized by the wave-induced fluctuations from the air-water interface to the water bulk, not by the bursting events with small fluctuations. It is also recognized by PIV measurements that the busting events are closely related to the unsteady wave-induced velocity fluctuations near the interface.

DOI： 10.2208/prohe.47.457

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風波発生下における自由水面近傍での組織構造に関する基礎的研究 Reviewed

禰津家久, 吉田圭介, 池田大輔, 垂井晃一

応用力学論文集 Vol.6 933 - 942 2003

A FUNDAMENTAL STUDY ON AIR-WATER TURBULENT STRUCTURES IN WIND-INDUCED OPEN-CHANNEL FLOWS Reviewed

NEZU Iehisa, YOSHIDA Keisuke, USHIJIMA Satoru

733/II-63 ( 733 ) 67 - 76 2003

FIFTH-ORDER CONSERVATIVE SCHEME WITH FLUX CONTROL APPLICABLE TO CONVECTION EQUATIONS Reviewed

USHIJIMA Satoru, YOSHIDA Keisuke, TAKEMURA Masaki, NEZU Iehisa

747/II-65 ( 747 ) 85 - 94 2003

非圧縮性混相流場に対する数値解法と水-シリコンオイル成層流への適用性に関する考察 Reviewed

牛島省, 吉田圭介, 禰津家久

応用力学論文集 6 891 - 898 2003

Experimental Study on Mutual Turbulent Structures across Air-Water Interface in Wind-Induced Water Waves by Synchronous LDA Measurements Reviewed

Nezu,I, Yoshida,K, Ikeda,D

Journal of Hydroscience and Hydraulic Engineering, JSCE. Vol.21 ( No.1 ) 63 - 70 2003

自由水面流れの数値計算における内部流動の解析精度に関する考察 Reviewed

牛島省, 禰津家久, 吉田圭介, 池田大輔

水工学論文集 Vol.47 409 - 414 2003

Numerical prediction of free surface flows with QSI scheme on collocated grid system Reviewed

Ushijima, S., Yoshida, K., Takemura, M. and Nezu, I.

Proc. 10th international symposium on flow visualization F0162 2002.8

Numerical prediction of free surface flows with QSI scheme on collocated grid system Reviewed

S. Ushijima, I. Nezu and K. Yoshida

Proc. 13th APD-IAHR Symp. 322 - 326 2002.8

Turbulence visualization of multi-scale water velocity fluctuations of wind-driven water waves in air-water two-phase flows Reviewed

I. Nezu, K. Yoshida and S. Ushijima

Proc. 10th International symposium on flow visualization F0088 2002.8

Experimental study on interfacial turbulent structures in wind-induced water waves by synchronous LDA measurements Reviewed

I. Nezu, S. Ushijima and K. Yoshida

Proc. 13th APD-IAHR Symp. 38 - 43 2002.8

水・空気層の同時計測による風波界面近傍流体の相関構造に関する研究 Reviewed

禰津家久, 吉田圭介

水工学論文集 Vol.46 547 - 552 2002

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