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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 羅弘岳 | zh_TW |
| dc.contributor.advisor | PETER HONG-YUEH LO | en |
| dc.contributor.author | 楊婉青 | zh_TW |
| dc.contributor.author | Wan-Ching Yang | en |
| dc.date.accessioned | 2023-08-15T16:46:35Z | - |
| dc.date.available | 2023-11-09 | - |
| dc.date.copyright | 2023-08-15 | - |
| dc.date.issued | 2023 | - |
| dc.date.submitted | 2023-07-31 | - |
| dc.identifier.citation | Abdulwahab, M. R., Ali, Y. H., Habeeb, F. J., Borhana, A. A., Abdelrhman, A. M.,& Al-Obaidi, S. M. A.(2020). A review in particle image velocimetry techniques(developments and applications). Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 65(2), 213-229.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88545 | - |
| dc.description.abstract | 孤立波是一種波浪形式，其非線性和頻散效應之間的平衡特性使其能夠長時間保持完整性。然而，對於孤立波作用於黏性泥床上的速度場研究仍然有限，尤其是針對孤立波作用於黏性泥床上的垂直圓柱結構物周圍的速度場的研究更加缺乏。以往的文獻主要使用真實的泥土進行實驗，但是由於泥土不透光，無法通過光學方法獲取高精度和高空間解析度的速度場測量數據。在本研究中，以透明黏性流體模仿泥土，並利用粒子影像測速法（particle image velocimetry, PIV）測量了孤立波傳遞到黏性泥床中的垂直圓柱結構物周圍的速度場，同時，利用Canny 邊緣偵測方法捕捉了泥面起伏的變化情況。研究結果顯示，黏性泥床會產生回流現象，即向波浪傳播的反方向流動。當孤立波通過垂直圓柱結構物時，我們觀察到在結構物的迎流側，泥面先上升再下降，而在背流側，泥面也呈現類似的變化。這項研究對於孤立波、黏性泥床和垂直圓柱結構物之間的相互作用，與實驗室前人研究的定性比較結果相似，並提供了較新穎的實驗方法，同時也提供了實驗數據供數值模型進行比對。 | zh_TW |
| dc.description.abstract | Solitary waves are a wave phenomenon that maintains integrity over a long duration due to the balance between nonlinearity and dispersion effects. However, there is limited research on the velocity field of solitary waves acting on a viscous mud bed, particularly around vertical cylindrical structures. Previous studies mainly employed real soil in experiments, but the opaqueness of soil restricts the acquisition of high-precision and high-spatial-resolution velocity field measurements using optical methods. In this study, a transparent viscous fluid was used as a surrogate for soil, and Particle Image Velocimetry (PIV) was employed to measure the velocity field around vertical cylindrical structures as solitary waves propagated into the viscous mud bed. Additionally, variations in the mud surface were captured using the Canny edge detection method. The results revealed the occurrence of flow reversal, i.e., flow in the opposite direction of wave propagation, in the presence of the viscous mud bed. As the solitary wave passed the vertical cylindrical structures, we observed an upward and then downward movement of the mud surface on the upstream side, while a similar pattern was observed on the downstream side. This study provides insights into the interaction between solitary waves, viscous mud beds, and vertical cylindrical structures, validating qualitatively with previous laboratory studies and offering a novel experimental approach and data for numerical model comparisons. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-08-15T16:46:35Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2023-08-15T16:46:35Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 I
謝誌 II 摘要 III Abstract IV 目錄 V 圖目錄 VIII 表目錄 XIV 第一章 緒論 1 1.1 研究動機與目的 1 1.2 文獻回顧 2 1.3 本文組織架構 5 第二章 孤立波理論 7 2.1 孤立波介紹 7 2.2 水在孤立波作用下的理論 8 2.3 黏性泥床在孤立波作用下的理論 9 2.4 水與泥界面的邊界層11 2.5 孤立波造波理論 12 第三章 實驗設置 13 3.1 實驗設備與材料 13 3.1.1 造波水槽系統架設 13 3.1.1.1 小型造波機結構 15 3.1.1.2 造波運動控制 19 3.1.2 凹槽、圓柱設計與高黏性流體選擇 20 3.1.3 超音波感測器 23 3.1.4 PIV 量測及可視化系統 25 3.1.4.1 高強度LED 光源系統 25 3.1.4.2 流場追蹤物質 26 3.1.4.3 高速攝影機 28 3.2 實驗方法 30 3.2.1 超音波感測器率定 30 3.2.2 實驗前置 31 3.2.3 座標系統與量測視野規劃 31 3.2.4 拍攝參數設定與計算 34 3.2.5 實驗條件 37 3.2.6 邊緣偵測 37 第四章 粒子影像測速方法 39 4.1 PIV 系統量測原理 39 4.2 PIVlab 影像分析原理 39 4.2.1 影像預處理 41 4.2.1.1 對比度受限的自適應直方圖均衡化（CLAHE） 41 4.2.1.2 高通濾波（high-pass） 42 4.2.1.3 強度上限（intensity capping） 42 4.2.2 PIV 分析方法 43 4.2.3 影像後處理 46 第五章 循環水槽速度驗證 48 5.1 循環水槽系統設置 48 5.2 PIV 系統設置 51 5.3 以紊流速度剖面進行驗證 52 第六章 造波水槽之實驗結果與討論 56 6.1 孤立波於固定水深之驗證 56 6.2 孤立波下兩相流速度場及泥面分析 60 6.2.1 水層的自由液面高度及速度場 60 6.2.2 泥層的速度場及泥面起伏高度 63 6.2.3 水層及泥層比對 68 6.2.4 有無泥床的水層速度場討論 69 6.3 孤立波下垂直圓柱周圍速度場及泥面變化分析 71 6.3.1 以水填充凹槽 72 6.3.2 以黏性流體填充凹槽 79 第七章 結論與未來展望 90 7.1 結論 90 7.2 未來展望 91 參考文獻 92 | - |
| dc.language.iso | zh_TW | - |
| dc.title | 以實驗方法研究孤立波於黏性泥床上過垂直圓柱 | zh_TW |
| dc.title | An Experimental Investigation on the Propagation of Solitary Waves through a Vertical Cylinder on a Viscous Mud Bed | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 111-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 張廣安;戴璽恆 | zh_TW |
| dc.contributor.oralexamcommittee | Kuang-An Chang;Albert Dai | en |
| dc.subject.keyword | 孤立波,速度場,PIV,垂直圓柱,黏性泥床, | zh_TW |
| dc.subject.keyword | solitary waves,velocity field,PIV,vertical cylindrical structures,viscous mud bed, | en |
| dc.relation.page | 99 | - |
| dc.identifier.doi | 10.6342/NTU202302517 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2023-08-02 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 工程科學及海洋工程學系 | - |
| dc.date.embargo-lift | 2028-07-31 | - |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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