Faculty Profiles - YOSHIDA Keisuke

Papers - YOSHIDA Keisuke

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Derivation of upstream boundary condition for 3-D numerical simulation of sediment dispersion around the Yangtze River mouth, China Reviewed

Wang, Z., Yoshida, K and Ishikawa, T.

Proc. 3rd Int. Conf. on Estuaries & Coasts 754 - 761 2009.9

実体視と画像相関解析を併用した洪水航空写真解析手法の構築と検証 Reviewed

箕浦靖久, 石川忠晴, 吉田圭介

水工学論文集 53 997 - 1002 2009

準3次元CIP-Sorobanモデルによる利根川洪水流の大規模数値計算 Reviewed

吉田圭介, 石川忠晴, 箕浦靖久

水工学論文集 53 877 - 882 2009

Quasi-3D solver of meandering river flows by CIP-Soroban scheme in cylindrical coordinates with support of boundary fitted coordinate method Reviewed

Yoshida, K. and Ishikawa, T.

Proc. 16th APD-IAHR Congress 2008.9

Flood flow analysis on aerial photos by image correlation method with support of stereo visualization Reviewed

Minoura, Y., Ishikawa, T. and Yoshida, K.

Proc. 16th APD-IAHR Congress 999 - 1004 2008.9

Flow solver of arbitrarily meandering river by CIP-Soroban-BFC scheme with quasi-3D method Reviewed

Yoshida, K. and Ishikawa, T.

Proc. 8th International Conference on HydroScience and Engineering 2008.9

Derivation of boundary condition for quasi-3D model of water exchange between Neijiang and Yangtze river Reviewed

Zhao, L., Yoshida, K., Ishikawa, T. and Futagi, K.

Proc. 16th APD-IAHR Congress 491 - 496 2008.9

Study on turbidity increase during flood in Myoginohana area of lake Kasumigaura Reviewed

Yoshida, K., Ishikawa, T., Kobayashi, Y., Sasaki, F., Aoyama, S. and Ichiyama, M.

Proc. 16th APD-IAHR Congress 472 - 477 2008.9

円筒座標CIP-Soroban法と境界適合座標法を組み合わせた蛇行河川の準3次元計算法 Reviewed

吉田圭介, 石川忠晴

水工学論文集 52 997 - 1002 2008

Depth-averaged numerical solver of meandering river flows by CIP-Soroban grids in cylindrical coordinate system Reviewed

Yoshida,K, Ishikawa, T

Journal of Hydroscience and Hydraulic Engineering, JSCE 26 ( 1 ) 11 - 28 2008

鎮江市内江の流動計算のための長江水理条件の導出 Reviewed

趙聯芳, 吉田圭介, 石川忠晴, 二木敬右

水工学論文集 52 1051 - 1056 2008

Numerical prediction of meandering river flows by CIP-Soroban grids in cylindrical coordinate system Reviewed

Yoshida, K. and Ishikawa, T.

Proc. 32nd IAHR Congress 2007.7

霞ヶ浦の妙技の鼻水域における出水時濁度上昇に関する研究 Reviewed

吉田圭介, 石川忠晴, 佐々木史, 青山貞雄, 市山誠

河川技術論文集 Vol.13 13 - 18 2007

EFFICIENT ANALYSIS OF RIVER FLOW FIELD ON AERIAL PHOTOGRAGHS BY CORRELATION METHOD WITH SUPPORTE OF STEREO VISUALIZATION Reviewed

MINOURA Yasuhisa, ISHIKAWA Tadaharu, YOSHIDA Keisuke

Doboku Gakkai Ronbunshuu B Vol.51 1093 - 1098 2007

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

Stereo images obtained from sequential aerial photographs of river freshets contain a lot of useful information for river hydraulics as well as river engineering works. The image correlation analysis is a standard technique for analyzing the images, but it sometimes produces anomalous results for the area where color fluctuation of the water surface is small. On the other hand, a classical manual analysis through stereo eyeglasses usually works well even in such unclear parts of the images, but the manual analysis costs much labor and time. <BR>In this study, a new technique to analyze stereo images of river flows is developed by combining the above mentioned two methods: A small amount of suggestions are made by using the results from the manual analysis for the image correlation analysis on a computer, and then the results of the second trial of the latter is much improved without any significant time consumption.

DOI： 10.2208/prohe.51.1093

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NUMERICAL SOLVER FOR SHALLOW-WATER MODEL OF MEANDERING RIVER FLOWS BY CIP-SOROBAN SCHEME IN CYLINDRICAL COODINATE SYSTEM Reviewed

YOSHIDA Keisuke, ISHIKAWA Tadaharu

Doboku Gakkai Ronbunshuu B Vol.51 805 - 810 2007

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

A new numerical solver is developed for a shallow-water flow model to simulate meandering river flows. This solver can investigate the flows in the curved river channel, by means of the adaptive CIP-Soroban (CIP-S) scheme in a cylindrical coordinate system. Time development of water velocity and free-surface level is computed by the orthogonal curvilinear coordinate system without any transformation of the governing equations, and the advection term is calculated by the high-accuracy CIP scheme. The numerical grid points of the waterfront line at the river bank are moved and tracked by the kinematic condition so that the grid points are always located on the line, and the rearrangement of the positions of the girds is easily conducted by the original CIP-S method. From the verification of this solver by the pure advection problem and by the numerical solution of the meandering river flows, in comparison with the CIP-S method in a Cartesian coordinate system and with the boundary fitted coordinate (BFC) method, it is shown that the proposed numerical solver reasonably predicts the main flow profile and water surface elevation and will be a promising numerical method as one of the practical solutions.

DOI： 10.2208/prohe.51.805

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Fundamental investigation of depth-averaged numerical model with evolution of secondary currents in curved channels Reviewed

Yoshida, K. and Ishikawa, T.

Proc. 15th APD-IAHR Congress 2006.8

2次流の時空間発展を考慮した水深積分モデルに関する基礎的検討 Reviewed

吉田圭介, 石川忠晴

水工学論文集, 第50巻 pp.781-786 781 - 786 2006

Direct numerical simulation of two-fluid system and its application to air-water turbulent flows with deformed interfaces Reviewed

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

Proc. 31st IAHR Congress 836 - 846 2005.9

風シアーと底面シアーが共存する開水路混成流における組織乱流構造と気液界面気体輸送過程に関する研究 Reviewed

吉田圭介,禰津家久

土木学会論文集 803/II-73 57 - 67 2005.5

DIRECT NUMERICAL SIMULATION OF AIR-WATER TURBULENT FLOWS WITH DEFORMED INTERFACE Reviewed

YOSHIDA Keisuke, USHIJIMA Satoru, NEZU Iehisa

Doboku Gakkai Ronbunshuu B 49 709 - 714 2005

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

In this study, a direct numerical simulation for analyzing the immiscible incompressible two-fluid flows was carried out with the 3-dimensional MARS method, and the applicability of this scheme was verified in the water column collapse phenomenon, 2-dimesional channel flows between two walls and 3-dimensinal air-water co-current flows between a non-slip wall and a free-slip wall. It was shown that the present numerical simulation was in good agreement with previous experimental and numerical results, and that the volume of fluid in flows was sufficiently conserved for the long simulation time step. However, it is pointed out in the 3-D air-water co-current flows that lack of simulation grids and inadequate averaged time generates the inaccurate results in this DNS.

DOI： 10.2208/prohe.49.709

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