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5 papers · 2 filters
Meandering instability of air flow in a granular bed: self-similarity and fluid-solid duality
Yuki Yoshimura, Yui Yagisawa, Ko Okumura
Meandering instability is familiar to everyone through river meandering or small rivulets of rain flowing down a windshield. However, its physical understanding is still premature,…
Exactly solvable model for a velocity jump observed in crack propagation in viscoelastic solids
Naoyuki Sakumichi, Ko Okumura
Needs to impart appropriate elasticity and high toughness to viscoelastic polymer materials are ubiquitous in industries such as concerning automobiles and medical devices. One of…
Statistical and hydrodynamic properties of topological polymers for various graphs showing enhanced short-range correlation
Erica Uehara, Tetsuo Deguchi
For various polymers with different topological structures we numerically evaluate the mean-square radius of gyration and the hydrodynamic radius systematically through simulation.…
Stationary bubble formation and cavity collapse in wedge-shaped hoppers
Yui Yagisawa, Hui Zee Then, Ko Okumura
The hourglass is one of the apparatuses familiar to everyone, but reveals intriguing behaviors peculiar to granular materials, and many issues are remained to be explored. In this…
Initial rigid response and softening transition of highly stretchable kirigami sheet materials
Midori Isobe, Ko Okumura
We study, experimentally and theoretically, the mechanical response of sheet materials on which line cracks or cuts are arranged in a simple pattern. Such sheet materials, often ca…