Velocity Fields of External and Boundary-Layer Flows during Run-up Phase of a Solitary Wave Traveling on a Sloping Beach

CHANG, LIN and MING-JER, KAO and WEI-YING, WONG (2017) Velocity Fields of External and Boundary-Layer Flows during Run-up Phase of a Solitary Wave Traveling on a Sloping Beach. In: Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017, 02-03 September, 2017, Zurich, Switzerland.

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Abstract

The characteristics of velocity fields of the external and boundary layer flo ws during run - up motion of a non - breaking solitary wave propagating over a 1:3 sloping beach are explored experiment ally. Flow visualization technique (FVT) of particle trajectory photography and high - speed particle image velocimetry (HSPIV) were employed to qualitatively observe and quantitatively measure the macro - viewed external and micro - viewed boundary layer flow fields . The experiments were conducted in wave flume equipped with a wave maker being triggered by a precise servo - motor . The incident wave - h eight to water - depth ratio s , H 0 / h 0 , is equal to 0. 363 . The slope of the sloping beach model is fixed at 1 :3. Profoundly d istinct characteristics of flow fields around the flow demarcation curve s, as observed respectively from the macro - view ed external flow and the micro - viewed boundary layer flow , are first interpreted, together with eluci dation of the flow reversal exhibiti ng wall - jet - like feature. A promising similar ity profile of the flow reversal underlying the flow demarcation curve is proposed by sele cting the characteristic length and velocity sca les in the boundary layer flow.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: velocity field, flow visualization, high-speed particle image velocimetry, wall jet
Depositing User: Mr. John Steve
Date Deposited: 11 Mar 2019 08:29
Last Modified: 11 Mar 2019 08:29
URI: http://publications.theired.org/id/eprint/376

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