42 citations · 210 across the 14 of their papers we have counts for
14 papers
Space-local Navier--Stokes turbulence
Ryo Araki, Wouter J. T. Bos, Susumu Goto
We investigate the physical-space locality of interactions in three-dimensional incompressible turbulent flow. To that, we modify the nonlinear terms of the vorticity equation such…
Characterizing Data Assimilation in Navier-Stokes Turbulence with Transverse Lyapunov Exponents
Masanobu Inubushi, Yoshitaka Saiki, Miki U. Kobayashi +1
Data assimilation (DA) reconstructing small-scale turbulent structures is crucial for forecasting and understanding turbulence. This study proposes a theoretical framework for DA b…
Correlation function and linear response function of homogeneous isotropic turbulence in the Eulerian and Lagrangian coordinates
Takeshi Matsumoto, Michio Otsuki, Takeshi Ooshida +1
We study the correlation function and mean linear response function of the velocity Fourier mode of statistically steady-state, homogeneous and isotropic turbulence in the Eulerian…
Attenuation of turbulence in a periodic cube by finite-size spherical solid particles
Sunao Oka, Susumu Goto
To investigate the attenuation of turbulence in a periodic cube due to the addition of spherical solid particles, we conduct direct numerical simulations using an immersed boundary…
Minimal model of quasi-cyclic behaviour in turbulence driven by Taylor--Green forcing
Ryo Araki, Wouter J. T. Bos, Susumu Goto
We attempt to formulate the simplest possible model mimicking turbulent dynamics, such as quasi-cyclic behaviour (QCB), using only three variables. To this end, we first conduct di…
Self-similar hierarchy of coherent tubular vortices in turbulence
Tomonori Tsuruhashi, Susumu Goto, Sunao Oka +1
Energy transfers from larger to smaller scales in turbulence. This energy cascade is a process of the creation of smaller-scale coherent vortices by larger ones. In our recent stud…
Mathematical reformulation of the Kolmogorov-Richardson energy cascade in terms of vortex stretching
Tsuyoshi Yoneda, Susumu Goto, Tomonori Tsuruhashi
In this paper, with the aid of direct numerical simulations (DNS) of forced turbulence in a periodic domain, we mathematically reformulate the Kolmogorov-Richardson energy cascade…
Transfer learning for nonlinear dynamics and its application to fluid turbulence
Masanobu Inubushi, Susumu Goto
We introduce transfer learning for nonlinear dynamics, which enables efficient predictions of chaotic dynamics by utilizing a small amount of data. For the Lorenz chaos, by optimiz…
Calculation of displacement correlation tensor indicating vortical cooperative motion in two-dimensional colloidal liquids
T. Ooshida, S. Goto, T. Matsumoto +1
As an indicator of cooperative motion in a system of Brownian particles that models two-dimensional colloidal liquids, displacement correlation tensor is calculated analytically an…
Sub critical transition to turbulence in three-dimensional Kolmogorov flow
Lennaert van Veen, Susumu Goto
We study Kolmogorov flow on a three dimensional, periodic domain with aspect ratios fixed to unity. Using an energy method, we give a concise proof of the linear stability of the l…
Insights from Single-File Diffusion into Cooperativity in Higher Dimensions
Takeshi Ooshida, Susumu Goto, Takeshi Matsumoto +1
Diffusion in colloidal suspensions can be very slow due to the cage effect, which confines each particle within a short radius on one hand, and involves large-scale cooperative mot…
Response function of turbulence computed via fluctuation-response relation of a Langevin system with vanishing noise
Takeshi Matsumoto, Michio Otsuki, Ooshida Takeshi +2
For a shell model of the fully developed turbulence and the incompressible Navier-Stokes equations in the Fourier space, when a Gaussian white noise is artificially added to the eq…
Analytical Calculation of Four-Point Correlations for a Simple Model of Cages Involving Numerous Particles
T. Ooshida, S. Goto, T. Matsumoto +2
Dynamics of a one-dimensional system of Brownian particles with short-range repulsive interaction (diameter sigma) is studied with a liquid-theoretical approach. The mean square di…
Acceleration Statistics as Measures of Statistical Persistence of Streamlines in Isotropic Turbulence
S. Goto, D. R. Osborne, J. C. Vassilicos +1
We introduce the velocity (Vs) of stagnation points as a means to characterise and measure statistical persistence of streamlines. Using theoretical arguments, Direct Numerical Sim…