234 citations · 272 across the 15 of their papers we have counts for
15 papers
Group-Theoretic Upper Bounds on Reconstructability in Inverse Problems
Isshin Arai, Tomoaki Itano
Reconstructing the causal structure of physical systems from observational data constitutes a fundamental inverse problem. Here we show that the reconstruction dimension---defined…
Nonlinear Aggregation of Phase Elements on the Unit Circle under Parametric External Fields
Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki
We investigate nonlinear aggregation dynamics of phase elements distributed on the unit circle under parametrically modulated external fields. Our model, inspired by flaky particle…
Probabilistic description of flake orientation suspended in rotating wave flows
Tomoaki Itano, Isshin Arai
In fluid dynamics experiments, flake-based flow visualization is a common technique to capture flow structures through the rays reflected from flat tracers suspended in the fluid.…
Revisiting visualization of spiral states in a wide-gap spherical Couette flow
Isshin Arai, Tomoaki Itano, Masako Sugihara-Seki
A pioneering study conducted by Egbers and Rath [Acta Mech. 111 pp. 125--140 (1995)] experimentally captured spiral waves to elucidate the transition in the wide-gap spherical Coue…
Numerical reproduction of the spiral wave visualized experimentally in a wide-gap spherical Couette flow
Kazuki Yoshikawa, Tomoaki Itano, Sugihara-Seki Masako
SCF experiments were conducted according to the work of Egbers and Rath [Acta Mech. 111 pp. 125--140 (1995)]. Through visualization using aluminium flakes drifting on a horizontal…
A thermal convection limit of spiral state in wide-gap spherical Couette flow
Tomoaki Itano, Fumitoshi Goto, Kazuki Yoshikawa +1
The symmetries of flow structures are often prescribed by their mechanical instability and geometry. Here, as an example, we present the homotopy of the rotating 3-fold spiral stat…
Bifurcation aspect of wide-gap spherical Couette flow emphasizing polygonal coherence and wave numbers observed over transitional Reynolds numbers
Fumitoshi Goto, Tomoaki Itano, Masako Sugihara-Seki +1
This study numerically investigates the bifurcation aspect of the wide-gap spherical Couette flow (SCF), with an emphasis on the competition among polygonal coherence with differen…
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…
Numerical study on the axisymmetric state in spherical Couette flow under unstable thermal stratification
Taishi Inagaki, Tomoaki Itano, Masako Sugihara-Seki
This paper numerically investigates the shear flow between double concentric spherical boundaries rotating differentially, so-called spherical Couette flow, under unstable thermal…
On the Formation of Unstirred Layer in Osmotically Driven Flow
Tomoaki Itano, Keito Konno, Taishi Inagaki +1
Osmotically driven flow across a semi-permeable membrane under a constant static pressure difference is revisited with referring to the previous reports for reverse osmosis. A few…
A simple dynamical model of a freely-falling train of rigid segments
Tomoaki Itano, Masako Sugihara-Seki
In order to elucidate the process underpinning the apparently counterintuitive phenomena observed in the freefall experiments conducted by E. Hamm and J. Géminard [Amer. J. Phys. 7…
Symmetry breaking perturbative flows to retrieve resonant modes in plane shear layers
Takeshi Akinaga, Tomoaki Itano, Sotos Generalis
We propose a simple computational procedure in order to resolve the degeneracy, which invariably exists on the background of fluid motion associated with a channel of infinite exte…
On the Spiral Roll State in Heat Convection between Non-Rotating Concentric Double Spherical Boundaries
Takahiro Ninomiya, Keito Konno, Masako Sugihara-Seki +1
The single-arm spiral roll state in the system of Boussinesq fluid confined between non-rotating double concentric spherical boundaries with an opposing temperature gradient previo…
Transition of Planar Couette Flow at infinite Reynolds numbers
T. Itano, T. Akinaga, S. C. Generalis +1
An outline of the state space of planar Couette flow at high Reynolds numbers () is investigated via a variety of efficient numerical techniques. It is verified from non…
Low-dimensional dynamics embedded in a plane Poiseuille flow turbulence : Traveling-wave solution is a saddle point ?
Sadayoshi Toh, Tomoaki Itano
The instability of a streak and its nonlinear evolution are investigated by direct numerical simulation (DNS) for plane Poiseuille flow at Re=3000. It is suggested that there exist…