ムラシゲ スナオ村重 淳教授Sunao MURASHIGE
■研究者基本情報
外部リンク
■研究活動情報
論文
- 〔主要な業績〕Two-dimensional stability analysis of finite-amplitude interfacial gravity waves in a two-layer fluid
Sunao Murashige and Wooyoung Choi, 筆頭著者
Journal of Fluid Mechanics, 2022年05月, ［査読有り］ - Parasitic capillary waves on small-amplitude gravity waves with a linear shear current
Sunao Murashige and Wooyoung Choi, 筆頭著者
Journal of Marine Science and Engineering, 2021年11月, ［査読有り］ - 〔主要な業績〕Linear stability of transversely modulated finite-amplitude capillary waves on deep water
Sunao Murashige and Wooyoung Choi, 筆頭著者
Studies in Applied Mathematics, 2021年02月, ［査読有り］ - 〔主要な業績〕Stability analysis of deep-water waves on a linear shear current using unsteady conformal mapping
筆頭著者
Journal of Fluid Mechanics, 2020年02月, ［査読有り］ - Long wave approximation using conformal mapping for large-amplitude internal waves in a two-fluid system
Sunao Murashige, Elsevier B.V.
Applied Numerical Mathematics, 2018年, ［査読有り］ - 〔主要な業績〕A numerical study on parasitic capillary waves using unsteady conformal mapping
Sunao Murashige; Wooyoung Choi
JOURNAL OF COMPUTATIONAL PHYSICS, 2017年01月, ［査読有り］ - A new method of convergence acceleration of series expansion for analytic functions in the complex domain
Sunao Murashige; Ken'ichiro Tanaka
JAPAN JOURNAL OF INDUSTRIAL AND APPLIED MATHEMATICS, 2015年03月, ［査読有り］ - 〔主要な業績〕HIGH-ORDER DAVIES' APPROXIMATION FOR A SOLITARY WAVE SOLUTION IN PACKHAM'S COMPLEX PLANE
Sunao Murashige; Wooyoung Choi
SIAM JOURNAL ON APPLIED MATHEMATICS, 2015年, ［査読有り］ - Davies' surface condition and singularities of deep water waves
Sunao Murashige
Journal of Engineering Mathematics, 2014年, ［査読有り］ - Convergence rates and explicit error bounds of Hill's method for spectra of self-Adjoint differential operators
Ken'ichiro Tanaka and Sunao Murashige
Japan Journal of Industrial and Applied Mathematics, 2014年, ［査読有り］ - 〔主要な業績〕Numerical use of exterior singularities for computation of gravity waves in shallow water
Sunao Murashige
Journal of Engineering Mathematics, 2012年, ［査読有り］ - 〔主要な業績〕On tsunami and the regularized solitary-wave theory
Theodore Y. Wu and Sunao Murashige
Journal of Engineering Mathematics, 2011年, ［査読有り］ - Dwarf solitary waves and low tsunamis
Sunao Murashige and Theodore Y. Wu
Journal of Hydrodynamics, 2010年, ［査読有り］ - Computation of Floquet multipliers using an iterative method for variational equations
Yu Nureki and Sunao Murashige
IEICE Transactions of Fundamentals of Electronics, Communications and Computer Sciences, 2009年, ［査読有り］ - Boundary conditions for numerical stability analysis of periodic solutions of ordinary differential equations
Sunao Murashige
IEICE Transactions of Fundamentals of Electronics, Communications and Computer Sciences, 2008年, ［査読有り］ - 再分割アルゴリズムを用いた力学系の定常分布の数値計算
濡木 融,村重 淳
電子情報通信学会論文誌, 2007年, ［査読有り］ - 写像により変換された曲線の折り返し点を用いた位相的エントロピーの計算
福島 真太朗,村重 淳
電子情報通信学会論文誌, 2007年, ［査読有り］ - A practical method of numerical calculation of the mapping degree
Sunao Murashige
IEICE Transactions of Fundamentals of Electronics, Communications and Computer Sciences, 2006年, ［査読有り］ - 自動微分とDE公式を用いた非整数階微分の数値計算
岡山 友昭,村重 淳, This paper proposes a new method of numerical calculation for fractional derivatives. Conventional methods using difference approximation have some defects such as rounding errors and computation time. In this paper, fractional derivatives are expressed as the combination of ordinary derivatives and integrals which are calculated using automatic differentiation and double exponential formula, respectively. Numerical examples show that the proposed method gives high-precision results with practical computational cost., 一般社団法人 日本応用数理学会
日本応用数理学会論文誌, 2006年, ［査読有り］ - Numerical computation of the mapping degree using computational homology
Kansaku Nakakura; Sunao Murashige
12th GAMM - IMACS International Symposium on Scientific Computing, Computer Arithmetic and Validated Numerics, SCAN 2006, Conference Post-Proceedings, 2006年, ［査読有り］ - 〔主要な業績〕Numerical verification of solutions of Nekrasov's integral equation
Sunao Murashige and Shin'ichi Oishi
Computing, 2005年, ［査読有り］ - Analysis of flagellar bending in hamster spermatozoa: characterization of an effective stroke
Kinukawa; M.; Ohmuro; J.; Baba; S.A.; Murashige; S.; Okuno; M.; Nagata; M.; and Aoki; F.
Biology of Reproduction, 2005年, ［査読有り］ - 〔主要な業績〕On necessary and sufficient conditions for numerical verification of double turning points
Ken'ichiro Tanaka; Sunao Murashige and Shin'ichi Oishi
Numerische Mathematik, 2004年, ［査読有り］ - Numerical verification of solutions of periodic integral equations with a singular kernel
Murashige; S. and Oishi; S.
Numerical Algorithms, 2004年, ［査読有り］ - Bifurcation structures of period-adding phenomena in an ocean internal wave model
Tanaka; G.; Murashige; S.; and Aihara; K.
International J. of Bifurcation and Chaos, 2003年, ［査読有り］ - Boundary element simulation of large amplitude standing waves in vessels
Hamano; K.; Murashige; S.; and Hayami; K.
Engineering Analysis with Boundary Elements, 2003年, ［査読有り］ - 〔主要な業績〕Nonlinear analyses of roll motion of a flooded ship in waves
Sunao Murashige; Taiji Yamada and Kazuyuki Aihara
Phil. Trans. R. Soc. Lond. A, 2000年, ［査読有り］ - 2次元しきい値分布を利用した流行現象の数理モデルとその解析
河根 拓文,村重 淳,合原 一幸
電子情報通信学会論文誌 A, 2000年, ［査読有り］ - Bifurcation and resonance of a mathematical model for non-linear motion of a flooded ship in waves
Sunao Murashige; Kazuyuki Aihara and Motomasa Komuro
J. of Sound and Vibration, 1999年, ［査読有り］ - 〔主要な業績〕Experimental study on chaotic motion of a flooded ship in waves
Sunao Murashige and Kazuyuki Aihara
Proc. R. Soc. Lond. A, 1998年, ［査読有り］ - Coexistence of periodic roll motion and chaotic one in a forced flooded ship
Murashige; S. and Aihara; K.
International Journal of Bifurcation and Chaos, 1998年, ［査読有り］ - Nonlinear roll motion of a flooded ship in regular waves, J. Society of Naval Architects of Japan
Murashige, S; Aihara, K, This paper describes dynamic effects of flooded water on nonlinear roll motion of a ship in regular beam waves. Experiments using a ferry model demonstrate nonlinear roll response of a flooded ship in waves. It is found that two kinds of roll motion with different amplitudes and periods coexist and that one of them is particularly irregular and complicated even in regular waves of relatively moderate amplitude. The reconstructed attractor of the roll motion in a delay-coordinate state space shows that it is not simple harmonic motion. In order to further study this complicated roll motion, we derived model equations which include both the nonlinear effects of the restoring moment and the coupling effects of roll and flooded water. The dynamic motion of flooded water produces the coupling effects which have been neglected in most previous works. Numerical solutions of the model equations show that this coupled system yields nonlinear phenomena similar to the experimental results. In addition, we also experimentally studied motion of a box-shaped model with flooded water in regular waves. The experimental results show that the roll response varies with changing the wave height in a complicated manner which also depends on the amount of flooded water, and that some of complicated roll motion have typical properties of low-dimensional deterministic chaos. These results suggest that the nonlinearly coupled dynamics of a ship and flooded water is a key to solve this problem., 日本造船学会
日本造船学会論文集, 1997年, ［査読有り］ - 〔主要な業績〕An ideal ocean wave focusing lens and its shape
Sunao Murashige and Takeshi Kinoshita
Applied Ocean Research, 1992年, ［査読有り］ - Ocean wave focusing : experiments and nonlinear computations
Murashige, S; Kinoshita, T; Suzuki, T
International Journal of Offshore and Polar Engineering, 1992年, ［査読有り］ - Are incident waves split into symmetrical and anti-symmetrical scattering wave systems with equal energy by two dimensional obstacles?
Sunao Murashige; Takeshi Kinoshita, Kato et al. reported that a wave height of a symmetrical component and an antisymmetrical component of scattered waves is exactly one half of that of incident waves, that is, "equally energy splitting law", and that in two dimensional diffraction problems this law does not require symmetry of a body geometry. It gives us valuable information as an invariant property. In the present note, however, we show that it is invalid in the case of an asymmetrical body, although it is reviewed as valid by Kan., 公益社団法人日本船舶海洋工学会
関西造船協会誌, 1991年, ［査読有り］ - 海洋波集波レンズの基礎的研究
村重 淳,木下 健, Wave focusing has been attracting ocean engineers as one of the most promising techniques to control ocean waves. It creates a calm sea area and helps efficient utilization of wave energy. In the present work, a hydrodynamic singularity distribution which expresses a wave focusing lens is derived by the method of matched asymptotic expansion, assuming slenderness of the lens and high frequency of incident waves. The singularity distribution gives the following necessary conditions for scattered waves in each section of the lens : there is no reflection from the lens and the transmitted waves suffer a phase shift in passing the lens. The phase shift is given by the wavenumber and the distance between the section and the focus. From these conditions, we examine a sectional shape of the lens and determine the whole geometry. It is shown by experiments and numerical computations using the two dimensional doublet distribution method that a submerged chevron shape plate, which is suitably folded, scatters a wave system which satisfies the above conditions at a certain wave frequency, but not in wide band of wave frequencies because of dispersion of water waves. Then it is shown by experiments that a certain number of submerged circular cylinders,which are horizontally arranged at intervals just like a raft, transmits waves which have enough phase shift to focus waves but reflects almost no waves in wide band of wave frequencies. Finally, we examine performances of three types of lens, namely, submerged fiat plate, submerged chevron shape plate, and submerged circular cylinders, in both regular and irregular waves. It is shown by numerical computations that the wave focusing efficiency of the lens consisting of circular cylinders is about twice that of the fiat plate type lens and that the drift force acting on the former is less than half of that on the latter in irregular waves., 日本造船学会
日本造船学会論文集, 1990年, ［査読有り］ - Singularity distribution for ocean wave focusing
Sunao Murashige; Takeshi Kinoshita
Proc. Japan Assoc. Coastal Zone Studies, 1990年, ［査読有り］
講演・口頭発表等
- 内部ボアの極限としての重力流について
海洋波の非線形運動の数理モデルと解析, 2025年03月24日 - Local flow structure near the separation point of gravity currents
BIRS 5-day Workshop, Nonlinear Water Waves: Rigorous analysis and Scientific Computing, 2024年10月28日, ［招待有り］ - 重力流の剥離点付近の局所解について
日本流体力学会 年会2024, 2024年09月26日 - Improvement of Benjamin's approximate solution for gravity currents
Applied Mathematics and Data Science II, 2024年07月11日, ［招待有り］
20240710, 20240712 - A numerical study on energy-conserving gravity currents past an air cavity
Workshop on Nonlinear Water Waves and Related Topics, 2023年11月10日 - 重力流と内部ボアの定常解
日本流体力学会 年会2023, 2023年09月22日 - 〔主要な業績〕Internal fronts and gravity currents
Recent Advances in Nonlinear Water Waves, 2023年03月28日 - 2層流体の界面で発生する内部ボアの定常進行波解
日本流体力学会 年会2022, 2022年09月27日 - 線形シアー流上で発生する parasitic capillary waves の数値的研究
日本流体力学会年会2021, 2021年09月23日 - Effects of a linear shear current on surface waves in deep wate
Sunao Murashige
Online seminar on nonlinear water waves and related topics, 2021年07月16日 - 有限振幅表面張力波の3次元的線形安定性解析
村重 淳
日本流体力学会 年会2020, 2020年09月20日 - 等角写像を用いた表面張力波の線形安定性解析
村重 淳
RIMS 研究集会 「非線形波動現象の数理とその応用」, 2019年10月17日 - 等角写像を用いた大振幅・定常進行水面波の線形安定性解析
村重 淳
日本流体力学会 年会2019, 2019年09月14日 - 〔主要な業績〕Stability of deep-water waves with constant vorticity
Sunao Murashige
Nonlinear waves, Theory, Computations and Real-World Applications, 2019年01月, ［招待有り］ - 線形シアー流上を進行する周期的深水波の2次元的定常運動
村重 淳
RIMS 研究集会 「非線形波動現象の数理とその応用」, 2018年10月18日 - 水波問題と複素解析
村重 淳
AIMap異分野ワークショプ「海岸・海洋における非線形問題に対する数学的手法の展開 ーモデリング，解析，数値計算ー」, 2018年10月06日, ［招待有り］ - 線形シアー流上を進行する水波の2次元的定常運動
村重 淳
日本流体力学会 年会2018, 2018年09月06日 - 〔主要な業績〕Two-dimensional stability of solitary waves on a linear shear current
Sunao Murashige
SIAM Conference on Nonlinear Waves and Coherent Structures, 2018年06月11日 - 〔主要な業績〕Large-amplitude solitary waves on a linear shear current
Sunao Murashige
Workshop on Nonlinear Water Waves -- In honor of Professor Mitsuhiro Tanaka on the occasion of his retirement --, 2018年05月23日 - 〔主要な業績〕Large amplitude motion of periodic internal waves in a two fluid system of finite depth
Sunao Murashige
Workshop on nonlinear water waves and related phenomena, 2018年02月19日, ［招待有り］ - 線形シアー流上を進行する定常水波に対する長波モデル
村重 淳
RIMS 研究集会 「非線形波動現象の数理とその応用」, 2017年10月11日 - 〔主要な業績〕Numerical and theoretical studies of nonlinear water waves using the hodograph transformation
Sunao Murashige
Dispersive hydrodynamics and oceanography: from experiments to theory, 2017年08月, ［招待有り］ - 〔主要な業績〕Long wave approximation with hodograph transformation for periodic internal waves in a two-fluid system
Sunao Murashige
The Tenth IMACS International Conference on Nonlinear Evolution Equations and Wave Phenomena: Computation and Theory, 2017年03月30日 - 海洋における非線形波動の数理
村重 淳
第12回数理工学セミナー, 2016年12月, 田中 健一郎（武蔵野大学）, ［招待有り］ - 非定常ホドグラフ変換を用いた水波の非線形運動の数値計算
村重 淳
RIMS 研究集会 「非線形波動現象の数理とその応用」, 2016年10月, 村重 淳 - 波長の長い重力水波に対する級数展開の収束性
村重 淳
日本流体力学会 年会2016, 2016年09月 - 〔主要な業績〕Generalization of Stokes' decay rate formula for solitary waves
Murashige, S
Mini-Workshop on Nonlinear Waves in Fluids -- In honor of Professor Funakoshi on the occasion of his retirement --, 2016年05月, 村重 淳 - 非定常等角写像を用いた重力・表面張力水波の強非線形計算
村重 淳
日本流体力学会 年会2015, 2015年09月 - 〔主要な業績〕Fully nonlinear computation of unsteady water waves using a non-stationary conformal mapping
Murashige, S
Workshop on Nonlinear Waves and Fluid Mechanics, 2015年08月, Wooyoung Choi (New Jersey Institute of Technology), ［招待有り］ - Improvement of convergence of series expansion for water wave solutions
Murashige; S>
Mini-Workshop on Nonlinear Water Waves, 2014年12月, 村重 淳 - 水面波に対する Davies 近似とその改良
村重 淳
RIMS 研究集会 「非線形波動現象のメカニズムと数理」, 2014年10月, 田中 光宏（岐阜大学） - 孤立波に対する高次 Davies 近似について
村重 淳
日本流体力学会 年会2014, 2014年09月 - 〔主要な業績〕Davies approximation of Levi-Civita's surface condition for water waves in the complex domain
Murashige, S
SIAM Conference on Nonlinear Waves and Coherent Structures, 2014年08月
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