Flow separation during solitary wave passing over submerged obstacle

Chii Jau Tang, Jyh Hwa Chang

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

This paper describes the experimental and numerical study of the vortex formation during the passage of a solitary wave over a rectangular structure submerged in water. The transient patterns of the separated flow (R=82 000) behind the block are visualized by tracing the motion of injected dye in a laboratory flume. The related numerical solution is calculated by using the stream function-vorticity formulation in a transient boundary-conformed grid system to satisfy the full nonlinear free-surface conditions. Both experimental and numerical results illustrate that a large vortex is first formed at the rear of the block, accompanied by a secondary eddy below it, as the solitary wave hits this block. Then the vortex is bulgy but decays with time, and the secondary eddy continues to grow in both size and strength as the primary vortex diffuses. The time development of these calculated flow patterns, including vortex shedding and vorticity transportation, agrees quite well with experimental observations.

Original languageEnglish
Pages (from-to)742-749
Number of pages8
JournalJournal of Hydraulic Engineering
Volume124
Issue number7
DOIs
Publication statusPublished - 1998 Jul 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

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