The steady and unsteady backwash vortices

Nobuhiro Matsunaga, H. Honji

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)189-197
Number of pages9
JournalJournal of Fluid Mechanics
Publication statusPublished - Jan 1 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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