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PIV measurement on flow characteristics behind a Tetrapod in uniform flow

균일 흐름에 놓인 테트라포드 후류 유동특성에 대한 PIV 계측

  • Gim, Ok-Sok (Ministry of Land Transport and Maritime Affairs) ;
  • Lee, Kyeong-Woo (Division of Ocean System Engineering, Mokpo National Maritime University)
  • 김옥석 (국토해양부 목포지방해양항만청) ;
  • 이경우 (목포해양대학교 해양시스템공학부)
  • Published : 2008.08.29

Abstract

Costal regions in Korea often suffer severe damages due to wave-induced disasters, storm surge disasters and so on. therefore, many engineers and researchers have devoted their energy to prevent these costal disasters. The development of artificial reefs including sunken vessels is one of their remarkable achievements and various kind of these artificial upwelling structures have been designed and applied. However, the flow characteristics around a Tetrapod under the water has not been investigated experimentally. So in this article, in uniform flow of circulating water channel and some different velocities, PIV measurement has been conducted on the flow characteristics behind a Tetrapod. The results were analyzed on the flow characteristics of both cases of a Tetrapod. Therefore, it can be concluded that the both cases have its own distinctive flow characteristics behind the bluff body; Case A has an steep upstream flow pattern. On the contrary, Case B has an developed downstream flow pattern in the near wake of the Tetrapod. The velocity gradient at position x=150mm of Case-A appears gently up and down But, the velocity gradient at the same position of Case-B appears better highly up and down.

Keywords

Artificial reef;Tetrapod;Particle image velocimetry(PIV);Breakwater;Flow pattern

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