35 citations · 172 across the 17 of their papers we have counts for
17 papers
Numerical analysis of viscoelasticity of two-dimensional fluid membranes under oscillatory loadings
Naoki Takeishi, Masaya Santo, Naoto Yokoyama +1
Biomembranes consisting of two opposing phospholipid monolayers, which comprise the so-called lipid bilayer, are largely responsible for the dual solid-fluid behavior of individual…
Inertial migration of red blood cells under a Newtonian fluid in a circular channel
Naoki Takeishi, Hiroshi Yamashita, Toshihiro Omori +3
We present a numerical analysis of the lateral movement and equilibrium radial positions of red blood cells (RBCs) with major diameter of 8 m under a Newtonian fluid in a circul…
Viscoelasticity of suspension of red blood cells under oscillatory shear flow
Naoki Takeishi, Marco Edoardo Rosti, Naoto Yokoyama +1
We present a numerical analysis of the rheology of a suspension of red blood cells (RBCs) for different volume fractions in a wall-bounded, effectively inertialess, small amplitude…
Variation of focusing patterns of laterally migrating particles in a square-tube flow due to non-Newtonian elastic force
Naoto Yokoyama, Hiroshi Yamashita, Kento Higashi +3
The elasto-inertial effects on particle focusing in a square-tube flow were investigated experimentally and numerically. Microscale experiments using spherical particles in dilute…
Energy-flux vector in anisotropic turbulence: application to rotating turbulence
Naoto Yokoyama, Masanori Takaoka
Energy flux plays a key role in the analyses of energy-cascading turbulence. In isotropic turbulence, the flux is given by a scalar as a function of the magnitude of the wavenumber…
Energy-based analysis and anisotropic spectral distribution of internal gravity waves in strongly stratified turbulence
Naoto Yokoyama, Masanori Takaoka
Stratified turbulence shows scale- and direction-dependent anisotropy and the coexistence of weak turbulence of internal gravity waves and strong turbulence of eddies. Straightforw…
Active lift inversion process of heaving wing in uniform flow by temporal change of wing kinematics
Makoto Iima, Naoto Yokoyama, Kei Senda
The transition of the vortex pattern and the lift generated by a heaving wing in a uniform flow was investigated numerically. Motivated by insects' flight maneuverability, we studi…
Integrated analysis of energy transfers in elastic-wave turbulence
Naoto Yokoyama, Masanori Takaoka
In elastic-wave turbulence, strong turbulence appears in small wave numbers while weak turbulence does in large wave numbers. Energy transfers in the coexistence of these turbulent…
Hysteretic behavior between quasi-two-dimensional flow and three-dimensional flow in forced rotating turbulence
Naoto Yokoyama, Masanori Takaoka
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 rat…
Single-wavenumber Representation of Nonlinear Energy Spectrum in Elastic-Wave Turbulence of {F}öppl-von {K}ármán Equation: Energy Decomposition Analysis and Energy Budget
Naoto Yokoyama, Masanori Takaoka
A single-wavenumber representation of nonlinear energy spectrum, i.e., stretching energy spectrum is found in elastic-wave turbulence governed by the Föppl-von Kármán (FvK) equatio…
Identification of Separation Wavenumber between Weak and Strong Turbulence Spectra for Vibrating Plate
Naoto Yokoyama, Masanori Takaoka
A weakly nonlinear spectrum and a strongly nonlinear spectrum coexist in a statistically steady state of elastic wave turbulence. The analytical representation of the nonlinear fre…
Numerical verification of random phase-and-amplitude formalism of weak turbulence
Mitsuhiro Tanaka, Naoto Yokoyama
The Random Phase and Amplitude Formalism (RPA) has significantly extended the scope of weak turbulence studies. Because RPA does not assume any proximity to the Gaussianity in the…
Weak and strong wave turbulence spectra for elastic thin plate
Naoto Yokoyama, Masanori Takaoka
Variety of statistically steady energy spectra in elastic wave turbulence have been reported in numerical simulations, experiments, and theoretical studies. Focusing on the energy…
Wave turbulent statistics in non-weak wave turbulence
Naoto Yokoyama
In wave turbulence, it has been believed that statistical properties are well described by the weak turbulence theory, in which nonlinear interactions among wavenumbers are assumed…
Resonant and Near-Resonant Internal Wave Interactions
Yuri V. Lvov, Kurt L. Polzin, Naoto Yokoyama
We report evaluations of a resonant kinetic equation that suggest the slow time evolution of the Garrett and Munk spectrum is {\em not}, in fact, slow. Instead nonlinear transfers…
Nonlinear wave-wave interactions in stratified flows: Direct numerical simulations
Yuri V. Lvov, Naoto Yokoyama
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 dynam…
Oceanic Internal Wave Field: Theory of Scale-invariant Spectra
Yuri V. Lvov, Kurt L. Polzin, Esteban G. Tabak +1
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…