Faculty Profiles - NAKAMURA Tomoaki

Presentations -

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人工浅場の地形変化と間隙水圧変動の時間変化に関する一考察

中村友昭，根笹裕太，水谷法美

土木学会第67回年次学術講演会

遡上津波による建築物前面での打上高と建築物間の底面流速変動に関する3次元数値解析

中村友昭，水谷法美，平川信也，芦澤　哲

土木学会第67回年次学術講演会

連成数値計算モデルの水柱崩壊問題への適用性と乱流モデルの影響に関する一考察

中村友昭，水谷法美

日本混相流学会年会講演会2012

Study on drift behavior of container on apron due to tsunami-induced incoming and return flow International conference

Nakamura, T., Mizutani, N., and Wakamatsu, Y.

International Conference on Coastal Engineering, ASCE

Event date： 2012.7

Language：English Presentation type：Oral presentation (general)

Country：Spain

The drift behavior of a shipping container on an apron resulting from a tsunami-induced incoming flow and subsequent return flow is investigated using hydraulic experiments and numerical simulations. Experimental and numerical results show that the container initially set parallel to a quay wall can fall into the sea when the relative overflow height of an incident tsunami is large regardless of the relative initial position of the container. This suggests that it is not always effective to shelter containers near the seawall before large tsunamis. In addition, it is not evident that the container initially set perpendicular to the quay wall drifts seaward, suggesting that an effective countermeasure would be to store containers on the apron in the cross-shore direction.

Possibility of seiche of Pohang New Port due to edge waves under ever present amplitude modulating swell of narrow band width

JSCE Chubu Branch Annual Meeting 2011, JSCE Chubu Branch

遡上津波と胸壁からの反射波によるエプロン上のコンテナの漂流挙動に関する数値解析

青山功治，中村友昭，水谷法美

平成23年度土木学会中部支部

津波作用時のケーソン式混成堤周辺の水位変動と水圧変動に関する一考察

安藤康平，山田裕貴，中村友昭，小竹康夫，水谷法美

平成23年度土木学会中部支部

浚渫土砂から成る人工浅場の地形変化とその要因に関する一考察

根笹裕太，中村友昭，水谷法美

平成23年度土木学会中部支部

浚渫土砂から成る人工浅場の地形変化に及ぼす波動場の影響に関する2次元数値解析

石原　遼，中村友昭，水谷法美

平成23年度土木学会中部支部

岩手県上閉伊郡大槌町における津波浸水シミュレーション

高杉有輝，川崎浩司，鈴木一輝，李　光浩，中村友昭，鈴木進吾

平成23年度土木学会中部支部

Investigation of bridge failure caused by tsunami based on numerical method

JSCE Chubu Branch Annual Meeting 2011, JSCE Chubu Branch

3次元流体・構造・地形変化連成数値計算モデルを用いた施工時における上部斜面堤の波浪動揺に関する数値シミュレーション

中村友昭，小竹康夫，水谷法美

第25回数値流体力学シンポジウム

Two-dimensional numerical analysis of wave-induced instability of artificial shallow composed of dredged soil International conference

Nakamura, T., Ishihara, R., and Mizutani, N.

Coastal Structures 2011, ASCE

Event date： 2011.9

Language：English Presentation type：Oral presentation (general)

Country：Japan

The stability of superficial soil of an artificial shallow composed of dredged soil is investigated using a coupled fluid-sediment interaction model. Numerical results computed using the model show that surface profile change of the shallow relates to large values of the mean Shields parameter, and suggest that the stability of the superficial soil can be assessed using the mean Shields parameter. It is also found that the relative vertical effective stress ratio (RVESR) in the surface layer of the shallow rises close to unity especially near the breaking point, resulting in an increase in the fluctuation of the Shields parameter. From this result, it is demonstrated that the stability of the superficial soil is overestimated unless the RVESR is taken into account in the Shields parameter. In addition, a protection layer composed of coarse materials covering the surface of the shallow is an effective countermeasure to improve the stability of the superficial soil.

Numerical simulation on local scouring around bottom-mounted movable short cylinder International conference

Nakamura, T., Yim, S. C., and Mizutani, N.

Coastal Structures 2011, ASCE

Event date： 2011.9

Language：English Presentation type：Oral presentation (general)

Country：Japan

A three-dimensional coupled fluid-structure-sediment interaction model is developed in this study. The model consists of an extended Navier-Stokes solver that computes incompressible viscous multi-phase flow, a volume-of-fluid module that tracks air-water interface motion, an immersed boundary module that tracks movable structure motion, and a sediment transport module that tracks suspended sediment motion and seabed profile evolution. For validation, the model is applied to hydraulic experiments on local scouring around a bottom-supported movable short cylinder. It is found that the model predicts reasonably well scour patterns around the cylinder consistent with those of the hydraulic experiments. In addition, the model can be applied to predict large scour evolution and subsequent large cylinder motion, thus demonstrating the usefulness of the model in predicting and analyzing dynamic behavior of complex fluid-structure-sediment interaction systems.

遡上津波と胸壁からの戻り流れによるエプロン上のコンテナの漂流挙動に関する3次元数値シミュレーション

中村友昭，水谷法美

日本混相流学会年会講演会2011

Three-dimensional coupled fluid-sediment interaction numerical model for suspended sediment analysis International conference

Nakamura, T. and Mizutani, N.

21th International Offshore and Polar Engineering Conference, ISOPE

Event date： 2011.6

Language：English Presentation type：Oral presentation (general)

Country：United States

A three-dimensional two-way coupled fluid-sediment interaction model applicable to suspended sediment analysis is developed in this study. For validation, the developed model is applied to hydraulic experiments on suspended sediment in a steady uniform flow and a swash zone. For both flow conditions, the predictive capability of the developed model is demonstrated against experimental data in terms of time-averaged suspended sediment concentration. Numerical results for the swash zone show that complex suspended sediment transport relates with three-dimensional vortex motion due to plunging breaking waves, and demonstrate the usefulness of the developed model in investigating suspended sediment transport under breaking waves.

Field survey for 2010 Chilean earthquake and tsunami disaster in ports and coasts International conference

Takahashi, S., Sugano, T., Tomita, T., Arikawa, T., Tatsumi, D., Kashima, H.,Murata, S., Matsuoka, Y., and Nakamura, T.

Proc., 8th International Conference on Urban Earthquake Engineering

遡上津波と胸壁からの反射波によるエプロン上のコンテナの漂流特性に関する一考察

若松靖弘，中村友昭，水谷法美

平成22年度土木学会中部支部

浸透滲出流による層流・乱流抵抗の影響を考慮した漂砂モデルに関する一考察

中村友昭，水谷法美

平成22年度土木学会中部支部

陸上遡上津波による非固定構造物周辺の局所洗掘に関する実験的研究

田邊　卓，中村友昭，水谷法美

平成22年度土木学会中部支部

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