A circulatory flow called a ‘backwash vortex’ forms under waves running up a sloping bed. The backwash vortex is classified into two types: the ‘steady backwash vortex’ and the ‘unsteady backwash vortex ‘. The former is a steady streaming formed when Re2< 90, and the latter an unsteady separated flow formed when Re2> 90, where Re2is a form of Reynolds number. The ratio of the lengthscale of the backwash vortex to the swash length is proportional to Re2½R when Re2≪ 30, and becomes constant when Re2is sufficiently large.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Applied Mathematics