title: Relationships between a roller and a dynamic pressure distribution in circular hydraulic jumps
abstract: We investigated numerically the relation between a roller and the pressure distribution to clarify the dynamics of the roller in circular hydraulic jumps. We found that a roller which characterizes a type II jump is associated with two high pressure regions after the jump, while a type I jump (without the roller) is associated with only one high pressure region. Our numerical results show that building up an appropriate pressure field is essential for a roller.
authors.affiliation: Division of Mathematics and Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan and Computational Science Division, RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan.
authors.initials: K
authors.lastname: Yokoi
authors.initials: F
authors.lastname: Xiao