J-GLOBAL         Last updated: Dec 6, 2019 at 12:05
Osaka University

Research Interests


Research Areas


Academic & Professional Experience

Apr 2008
Mar 2010
Assistant Professor, Doshisha University Faculty of Science and Engineering, Department of Mechanical and Systems Engineering


Graduate School, Division of Natural Science, Kyoto University
Graduate School, Division of Natural Science, Kyoto University
Faculty of Science, Kyoto University

Published Papers

Naoto Yokoyama, Masanori Takaoka
Physical Review Fluids   4    Oct 2019
© 2019 American Physical Society. Stratified turbulence shows scale- and direction-dependent anisotropy and the coexistence of weak turbulence of internal gravity waves and strong turbulence of eddies. Straightforward application of standard analy...
Iima Makoto, Yokoyama Naoto, Senda Kei
PHYSICAL REVIEW E   99(4)    Apr 2019   [Refereed]
Mizushima Jiro, Matsuda Rei, Yokoyama Naoto
FLUID DYNAMICS RESEARCH   51(2)    Apr 2019   [Refereed]
Jayakumar Jeeva, Senda Kei, Yokoyama Naoto
JOURNAL OF AIRCRAFT   55(6) 2327-2337   Nov 2018   [Refereed]
Tanaka Mitsuhiro, Yokoyama Naoto
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS   71 103-112   Sep 2018   [Refereed]
Naoto Yokoyama, Masanori Takaoka
Physical Review Fluids   2    Sep 2017
© 2017 American Physical Society. Conflict between formation of a cyclonic vortex and isotropization in forced homogeneous rotating turbulence is numerically investigated. It is well known that a large rotation rate of the system induces columnar ...
Jiro Mizushima, Kazuki Abe, Naoto Yokoyama
Physical Review Fluids   2    Aug 2017
© 2017 American Physical Society. The bathtub vortex has been found to autonomously arise owing to instability of a symmetric flow in a rectangular vessel when water is drained. We consider a model flow through a vessel with a rectangular horizont...
Yokoyama N, Takaoka M
Physical review. E   96(2-1) 023106   Aug 2017   [Refereed]
Naoto Yokoyama, Masanori Takaoka
Masanori Takaoka, Naoto Yokoyama
Journal of Physics: Conference Series   574    Jan 2015   [Refereed]
Jiro Mizushima, Kazuki Abe, Naoto Yokoyama
Physical Review E   90(4) 041002   Oct 2014   [Refereed]
Naoto Yokoyama, Masanori Takaoka
Physical Review E   89(1) 012909   Jan 2014   [Refereed]
Mitsuhiro Tanaka, Naoto Yokoyama
PHYSICAL REVIEW E   87(6) 062922   Jun 2013   [Refereed]
Naoto Yokoyama, Masanori Takaoka
PHYSICAL REVIEW LETTERS   110(10) 105501   Mar 2013   [Refereed]
Naoto Yokoyama, Kei Senda, Makoto Iima, Norio Hirai
PHYSICS OF FLUIDS   25(2)    Feb 2013   [Refereed]
Controlling Flow Structures by Wing Motion in a Flapping-flight Model
Makoto Iima, Naoto Yokoyama, Norio Hirai, Kei Senda
Advances in Science and Technology, Mining Smartness from Nature   84    Jan 2013   [Refereed]
Kei Senda, Takuya Obara, Masahiko Kitamura, Naoto Yokoyama, Norio Hirai, Makoto Iima
BIOINSPIRATION & BIOMIMETICS   7(2) 025002   Jun 2012   [Refereed]
Naoto Yokoyama, Yuki Maruyama, Jiro Mizushima
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81(7)    Jul 2012   [Refereed]
Yuri V. Lvov, Kurt L. Polzin, Naoto Yokoyama
JOURNAL OF PHYSICAL OCEANOGRAPHY   42(5)    May 2012   [Refereed]
Kei Senda,Takuya Obara,Masahiko Kitamura,Tomomi Nishikata,Norio Hirai,Makoto Iima,Naoto Yokoyama
Robotics and Autonomous Systems   60(5) 670-678   2012   [Refereed]
Naoto Yokoyama
PHYSICS LETTERS A   375(48)    Nov 2011   [Refereed]
Mitsuhiro Tanaka, Naoto Yokoyama
PHYSICA D-NONLINEAR PHENOMENA   240(14-15)    Jul 2011   [Refereed]
Yuri V. Lvov, Kurt L. Polzin, Esteban G. Tabak, Naoto Yokoyama
Journal of Physical Oceanography   40 2605-2623   Dec 2010
Steady scale-invariant solutions of a kinetic equation describing the statistics of oceanic internal gravity waves based on wave turbulence theory are investigated. It is shown in the nonrotating scale-invariant limit that the collision integral i...
Yuri V. Lvov, Naoto Yokoyama
Physica D: Nonlinear Phenomena   238 803-815   May 2009
To investigate the formation mechanism of energy spectra of internal waves in the oceans, direct numerical simulations are performed. The simulations are based on the reduced dynamical equations of rotating stratified turbulence. In the reduced dy...
Naoto Yokoyama
Journal of Fluid Mechanics   169-178   Feb 2004
We perform direct numerical simulations of dynamic equations of decaying gravity waves on infinite-depth water. Power-law behaviour of the wave action spectrum and structure functions of the surface elevation is obtained. These power laws agree wi...
Mitsuhiro Tanaka, Naoto Yokoyama
Fluid Dynamics Research   34 199-216   Jan 2004
The effects of discretization of the spectrum on the evolution of weak turbulence of surface gravity waves are investigated by direct numerical simulations. Discretization of the spectrum is implemented by imposing periodic boundary conditions on ...


Kei Senda, Naoto Yokoyama, Koji Yokoi, Masahiko Kitamura
Proceedings of the IASTED International Conference on Modelling, Simulation, and Identification, MSI 2011   428-435   Dec 2011
The objective of this study is to clarify the effects of structural flexibility of wings in flapping butterflies. The flapping butterflies are observed in the experiments, and they are compared with the dynamical model that is a rigid multi-body s...