The Effect of Viscosity on Wave Energy Transfer Mechanisms in Three Dimensions

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Project title

Code/計畫編號

NSC101-2628-E022-001-MY2

Translated Name/計畫中文名

黏性對三維波浪能量轉換機制之影響

Project Coordinator/計畫主持人

Chia-Cheng Tsai

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Engineering,NKUST

Website

https://www.grb.gov.tw/search/planDetail?id=2581901

Year

2012

Start date/計畫起

01-08-2012

Expected Completion/計畫迄

31-07-2013

Bugetid/研究經費

977千元

ResearchField/研究領域

海洋科學

海浪發電等技術一直是極富有競爭力的發電方式，最近在美國、葡萄牙、英格蘭以及蘇格蘭正在測試其波浪發電之設備，這種技術包括波浪能量轉換裝置。而台灣政府也在考慮這項設施的實施。海浪能源的提取技術上有眾多技術和實際上的挑戰與難題，其中最大的挑戰是理解和預測波浪能量轉移的機制和與其受波能場(wave farm)之影響及在任意水深上波能轉化的預測。本研究計畫提供了兩種方法來了解波能的轉移機制。第一種是所謂的平面波近似，考慮波的黏滯性，和底床磨擦效應，這可以擴展到三維空間來做評估。第二種是利用程式來計算流體力學黏性波的問題，其採用自調適四元或八元樹狀網格，並使用VOF的技術來描述自由液面。因此，可以預期本計畫將發展兩種方法將分析黏性波的問題。且該模式是非常穩定且有效率的，如此當國家開發波浪能源技術時將可以提供數值模型等資訊 It is well known that recent technological advances have made it possible to capture the energy of ocean waves for electricity generation at a competitive cost. Wave farms are being developed in the United States, Portugal, England, Scotland and, while wave-powered devices are being tested in other locations. Examples of this technology include the wave energy converter. The government of Taiwan has also been considering its implementation. The process of developing technologies for the efficient extraction of energy from ocean waves provides a range of technical and practical challenges. One of the critical challenges is the understanding of wave energy transfer mechanism and the prediction of wave energy transformation by a wave energy farm or over an arbitrary bathymetry. This project is going to develop two categories of methods to understand the viscous wave energy transfer mechanism. The first one is a viscous plan-wave approximation, which takes the viscosity effect and bottom friction into considerations, and can be potentially extended to three dimensions. The second one is a code of computational fluid dynamics to viscous wave problems, which uses adaptive quadtree/octree meshes incorporated with the technique of volume of fluid to describe the free surface. Therefore, it can be predicted that two models will be developed to analyze the problems of viscous waves. The models will be very stable and efficient. This can support the national development of the technology of wave energy.

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The Effect of Viscosity on Wave Energy Transfer Mechanisms in Three Dimensions

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