浮式離岸風機基座之流固耦合模擬

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曾朝語(Chao-Yu Tseng) 查詢紙本館藏

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土木工程學系

論文名稱

浮式離岸風機基座之流固耦合模擬
(Fluid/Solid Coupled Simulation of the Sub-structure of Floating Offshore Wind Turbines)

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摘要(中)

近年來，全球各國都在開發海上風能，海上風力發電機可分為固定式基樁風機和浮式風機。本研究使用水槽實驗和流體/固體耦合數值模型來研究固定基樁風機與浮式風機Spar型基座在孤立波中的運動，利用三維大渦模式模擬圓柱體形基座受孤立波所受的波浪力。浮式基樁則以下重上輕的圓柱體來模擬，在靜止水中浮體簡單振盪試驗，發現數值模式的阻尼比 = 0.70與實驗結果最為接近，平均振盪週期與理論值的誤差為2.0%。在孤立波中，浮動圓柱所受的波浪力與位移與波高成線性正比，且大渦模式模擬得之波浪力十分接近由位移間接計算得之外力。此外，本研究探討不同波高對固定圓柱的波浪力，模擬結果發現：細長圓柱體的最大波浪荷載可以用一無因次阻力係數來計算，而波長的延長可使得作用在圓柱上的波浪荷載持續時間更長，儘管力的大小有所減小。並在相同流況下，比較固定圓柱和浮動圓柱所受的波浪力，發現固定圓柱所受的水平力遠大於浮動圓柱，這是由於浮動圓柱將大部分的波浪力轉換為推動圓柱之動能，導致受力減少。

摘要(英)

This study incorporates a large eddy simulation (LES) model and a two-way coupled fluid/solid algorithm to investigate the wave loads on a fixed and a floating circular cylinder in solitary waves. The experimental results of the wave flume are used to validate the numerical simulations. The following findings are summarized based on the simulation results. In a simple oscillation test of a floating cylinder in stationary water, there is about 2.0% difference between the simulated and observed oscillation periods when the damping ratio is α = 0.70. In solitary waves, the wave loads and maximum displacements of the floating cylinder are linearly proportional to the wave height. The simulated wave loads obtained from the LES model closely match the values computed from the observed displacements of the floating cylinder. This study also examines the wave loads of a fixed cylinder under different wave heights and water depths. The simulation results indicate that the maximum wave load on a slender cylindrical body can be calculated using a dimensionless drag coefficient, and increasing the wavelength extends the duration of the wave impact on the cylinder. Furthermore, the wave loads experienced by a fixed cylinder are significantly larger than that on a floating cylinder under the same wave conditions. This is attributed to the fact that the floating cylinder converts most of the wave load into the kinetic energy of the floating cylinder.

關鍵字(中)

★ 流固耦合
★ 波浪荷載
★ 大渦模擬
★ 離岸風機
★ 浮式風機

關鍵字(英)

★ Fluid/Structure Interaction
★ Wave load
★ LES model
★ Off-shore Turbine
★ Floating Structure

論文目次

Abstract II
Contents III
Figure captions IV
Table captions VIII
Chapter 1 Introduction 1
Chapter 2 Numerical Model 4
Chapter 3 Model Validation 11
3.1 Vertical oscillation 11
3.2 Floating Cylinder 12
Chapter 4 Results and Discussion 16
4.1 Fixed Cylinder 16
4.2 Floating Cylinder 18
4.3 Wind Effect 19
Chapter 5 Conclusions 21
References 22
Figure 24
Table 66

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指導教授

朱佳仁

審核日期

2023-7-27

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