研究者業績

水谷 夏樹

ミズタニ ナツキ  (Mizutani Natsuki)

基本情報

所属
大阪産業大学 工学部都市創造工学科 教授
学位
博士(工学)(2001年3月 岐阜大学)

研究者番号
50356036
J-GLOBAL ID
200901073146601850
researchmap会員ID
5000092863

外部リンク

論文

 47

MISC

 20
  • 水谷夏樹
    油空圧技術 643(13) 30-34 2012年  招待有り
  • 水谷夏樹
    ながれ 30(3) 205-210 2011年  招待有り
  • 玉野富雄, 水谷夏樹, 金岡正信
    和歌山県指定史跡水軒堤防発掘調査報告書 73-80 2011年  
  • K. Takehara, T. G. Etoh, T. Tamano, M. Kanaoka, N. Mizutani
    28TH INTERNATIONAL CONGRESS ON HIGH-SPEED IMAGING AND PHOTONICS 7126 ICHSIPS28 2009年  
    The authors applied an ultra-high-speed video camera to visualize crack propagation in brittle bodies, such as mortar specimens, under the impact splitting test. Strain of the brittle bodies in impact splitting tests was analyzed by means of PIV (Particle Image Velocimtery), which is usually used for measurements of flow fields with tracer particles. The results show that, when the applied impulse on the mortar specimens is increased, the crack propagation velocity reaches an upper bound. The upper bound of the crack propagation velocity was 2.6 km/sec. The horizontal tensile strain around the crack tip was estimated to be 370 mu by PIV measurement with the ultra-high-speed camera, and 270 375 mu by strain gages, respectively. Those results showed a good agreement with each other.
  • Oh, S.H, N. Mizutani, K.D. Suh
    The 4th International Conference on Vortex Flows and Models CD-ROM 2008年  
  • 水谷 夏樹, キム ビョンイル
    可視化情報学会誌 27(2) 9-10 2007年  筆頭著者
    This study investigated about the continuity of momentum flux through an air-water interface. We conducted to measure air-flow and water-flow very close to a water surface in a wind wave tank using PIV technique. To evaluate of the continuity of momentum flux calculating from the friction velocity was very difficult, because we could not detect exact a mean water level to fit a log-law profile for the experimental data. The viscous stress affected not only the viscous sub layer but also the turbulent boundary layer. The ratio of the viscous stress in water-flow is from several percent to about ten percent. We deduced that the continuity of momentum flux calculating from the total stress was strongly affected by three-dimensional turbulent water-flow.
  • 滝野 雄一, 宮島 昌弘, 水谷 夏樹
    可視化情報学会誌. Suppl. 26(2) 53-54 2006年9月15日  
    The characteristic of roll-wave flow, which is a flow with high Froude number which appears on the steep slope, is hardly known at present. In laboratory experiment, it was difficult to measure the flow profile which is a thin sheet flow having the characteristic of a wave and a flow.<BR>In this study we measured the velocity field of the roll-wave flow using PIV technique. We also investigated the behaviors of the velocity field in each region separated into five parts of one wave length. As a result, the relationship between velocity field and the water depth in each part was clarified. It also appeared that the velocity profile is grater than a log-law profile at every region.
  • 大島 賢吾, 金岡 正信, 水谷 夏樹, 竹原 幸生, 玉野 富雄
    可視化情報学会誌 26(2) 207-210 2006年  
    The purpose of this research is to explore the mechanism required for the generation of earthquake vibration on the propagation velocity of the crack in fault plane. In this research, the impact splitting tensile tests of mortar and granite were carried out, and the propagation velocity of the crack was visualized and obtained by image analysis using ultra high-speed video camera. A relationship between the impulse which is impact loading and propagation velocity of the crack was observed. There appears to be a critical state in which propagation velocity does not increase, even if impulse is increased over it. It was proven to converge in 2.6 km/sec. Next, the mechanism of the development of the dynamics of the crack by the impulse was examined from displacement vector and Particle Image Velocimetry (PIV) analysis.
  • K. Takehara, N. Ohtsuka, T. G. Etoh, Y. Takano, G. Tsujimoto, N. Mizutani
    Proceedings of the Coastal Engineering Conference 2005- 1060-1071 2005年4月1日  査読有り
    In order to clarify the mechanisms of wind waves, the air and water flows close to the water surface were simultaneously measured by using the Image Velocimetry, the IV. In this study, a Particle Tracking Velocimetry, so-called PTV, was used as IV, which can measure the velocity vectors in the vicinity of the water surface. The experiments were carried out in the range where whitecaps cannot appear. From the measured planar velocity distributions, the instantaneous vorticity distributions in air and water were evaluated.
  • Oh, S. H, Soul, National University, K. D. Suh(Soul National University, N. Mizutani(Osaka, Sangyo Univ
    Proc. Asian and Pacific Coasts 2005 CD-ROM 2005年  査読有り
  • 水谷夏樹, 鈴木 武
    国土技術政策総合研究所資料 (259) 1-14 2005年  査読有り
  • 水谷夏樹, 鈴木 武
    国土技術政策総合研究所資料 170(170) 1-7 2004年  査読有り
  • 水谷夏樹, 鈴木 武
    国土技術政策総合研究所資料 (171) 1-8 2004年  査読有り
  • 水谷夏樹, 鈴木 武
    国土技術政策総合研究所資料 (172) 1-10 2004年  査読有り
  • 水谷夏樹, 業大学)・OH, 佐藤裕司, 鈴木 武
    国土技術政策総合研究所資料 (90) 1-13 2003年  査読有り
  • 水谷 夏樹, 橋本 典明
    可視化情報学会誌 = Journal of the Visualization Society of Japan 22 193-196 2002年7月1日  
    Air flow over wind waves generated in a wind wave frame was visualized by water vapor, and instantaneous air flow fields over white-caps were obtained by a PIV system. Three air flow separation patterns were detected, which were decided by the situation of white-capping progress. The air flow separated from wind wave crest is accompanied by inverse flow at the forward face of wave crest. It was found that the frequency of air flow separation with inverse flow was about 6%. Also, the characteristics of the velocity distribution of the air flow field were compared with the mean wind velocity using conventional wind profiler.
  • 水谷夏樹, 業大, 佐藤裕司, 交通, 鈴木 武
    国土技術政策総合研究所資料 (35) 1-16 2002年  査読有り
  • Isaka, K.(Gifu University, T. Yasuda(Gifu University, N. Mizutani(Osaka, Sangyo Univ
    Proc. 8th Int. Sympo. Flow Modeling and Turbulent Measurements, IAHR 429-436 2001年  
  • Ogasawara, T, Iwate, T. Yasuda(Gifu University, N. Mizutani(Osaka, Sangyo Univ
    Proc. 8th Int. Sympo. Flow Modeling and Turbulent Measurements, IAHR 381-388 2001年  
  • 安田孝志, 陸田秀実, 水谷夏樹
    京都大学数理解析研究所講究録 949(949) 244-253 1996年  

講演・口頭発表等

 36

所属学協会

 5

主要な共同研究・競争的資金等の研究課題

 15

学術貢献活動

 3

研究テーマ

 3
  • 研究テーマ
    陸上遡上する津波によって構造物に作用する波力に関する研究
    キーワード
    水理実験,可視化実験,モデル化
    研究期間(開始)
    2013/04/01
  • 研究テーマ
    海洋における風波の発達過程の解明とそのモデル化に関する研究
    キーワード
    風波、波浪推算、可視化実験、数値解析
    概要
    研究期間(開始)
    1999/04/01
  • 研究テーマ
    海岸における砕波機構の解明に関する研究
    キーワード
    砕波、海岸保全、可視化実験、数値解析
    概要
    研究期間(開始)
    1993/04/01