15 citations · 47 across the 6 of their papers we have counts for
6 papers
Impact-induced collapse of an inclined wet granular layer
S. Takizawa, H. Niiya, T. Tanabe +2
The collapse of an inclined cohesive granular layer triggered by a certain perturbation can be a model for not only landslides on Earth but also relaxations of asteroidal surface t…
Spatiotemporal Structure of Aeolian Particle Transport on Flat Surface
Hirofumi Niiya, Kouichi Nishimura
We conduct numerical simulations based on a model of blowing snow to reveal the long-term properties and equilibrium state of aeolian particle transport from $10^{-5} \hspace{0.5 e…
Simple particle model for low-density granular flow interacting with ambient fluid
Hirofumi Niiya, Akinori Awazu, Hiraku Nishimori
To understand the process of pattern formation in a low-density granular flow, we propose a simple particle model. This model considers spherical particles moving over an inclined…
Stability of transverse dunes against perturbations; a theoretical study using dune skeleton model
H. Niiya, A. Awazu, H. Nishimori
The dune skeleton model is a reduced model to describe the formation process and dynamics of characteristic types of dunes emerging under unidirectional steady wind. Using this mod…
Bifurcation analysis of the transition of dune shape under unidirectional wind
Hirofumi Niiya, Akinori Awazu, Hiraku Nishimori
A bifurcation analysis of dune shape transition is made. By use of a reduced model of dune morphodynamics, dune skeleton model, we elucidate the transition mechanism between differ…
3D Dune Skeleton Model as a Coupled Dynamical System of 2D Cross-Sections
Hirofumi Niiya, Akinori Awazu, Hiraku Nishimori
To analyze theoretically the stability of the shape and the migration process of transverse dunes and barchans, we propose a {\it skeleton model} of 3D dunes described with coupled…