Numerical Investigation on the Interaction between Wave – Composite Undulating Submerged Obstacles Using Two-Phase Flow Model

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Project title

Code/計畫編號

MOST106-2221-E236-003

Translated Name/計畫中文名

兩相流模式應用於波浪與複合式波浪形沒水結構物交互作用之數值研究

Project Coordinator/計畫主持人

Ruey-Syan Shih

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

Department of construction and spatial design, Tungnan University

Website

https://www.grb.gov.tw/search/planDetail?id=12231298

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

31-07-2018

Bugetid/研究經費

569千元

ResearchField/研究領域

土木水利工程

本計劃主要以兩相流數值模式(two-phase flow model)探討淺水區域內，波長較短的週期性波浪和波長較長的孤立波通過複合式波浪潛堤後的波浪變化與波動場特性，並探討作用區域水面波形變化、速度場與水分子之運動軌跡。計畫將參考Shih 等(2013, 2014, 2016)中以水工模型試驗的各項成果，利用數值方法探討該系列研究中，以邊界元素法考量多相流體運動所建立之數值水槽來陸續完成，藉由此數值模式來模擬實際造波水槽之各種造波問題。本計畫擬利用數值模擬的方式來深入探討週期性規則波浪、不規則波浪及孤立波通過複合式波浪型潛堤後所產生的渦流現象及速度場的變化，尤其是對孤立波速度場的模擬，可做為進一步利用數值方法來探討海嘯通過波浪型潛堤後，與沒水潛堤交互作用過程中，各組潛堤之間與潛堤之前、潛堤之後底床砂石的移動特性，以及波浪通過任意高度遞增潛堤、潛堤組間距等所產生的反射波及交互作用下內部速度場的研究，結果將有助於結構物附近臨底輸砂特性之研究，而交互作用區內水粒子的運動軌跡更有助於漂砂運動的研究與評估，可做為研究近海地區結構物受海嘯影響所造成的海岸變遷與海底地形變化的研究基礎，無論是在學術研究或實際工程之應用上均具有實質上的意義。 In this project, the wave and wave field characteristics in the shallow water region cause by periodic waves and solitary waves are analyzed by the two-phase flow model. The variations of water surface waveform, the velocity field and the trajectory of water molecules are also discussed. A multiphase flow model is used to study of wave-structure interactions problems referred to the results of hydraulic model tests obtained by Shih et al. (2013, 2014, 2016). The numerical simulation method is used to study the eddy current phenomena and velocity field of periodic wave, irregular wave and solitary wave after propagating the composite submerged undulating obstacles. In particular, the simulation of the velocity field in solitary waves can be further used as a numerical method to discuss the interaction process of the tsunami through the wave-type submerged dykes and the bottom bed sand after the submarine levee as a basis for studying coastal changes and seabed topographic changes caused by tsunamis in coastal structures. The movement characteristics of sand and gravel between sublevel dykes and sand bodies of front and rear beds can be further studied. The motion trajectories of the water particles in the interaction zone contribute to the research and evaluation of the sand drift movement as a basis for studying the coastal changes and seabed topographic changes caused by tsunamis in coastal structures, whether in academic research or practical application of the project are of substantial significance.

Keyword(s)

兩相流
數值水槽
速度場
複合式波浪形潛堤
孤立波
周期波
Two-phase flow
numerical water tank
velocity field
composite undulating breakwater
solitary wave
periodical wave

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Numerical Investigation on the Interaction between Wave – Composite Undulating Submerged Obstacles Using Two-Phase Flow Model

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