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Study on the Characteristics of Flow Field Induced by a solitary Wave Propagating over a Submerged Circular Cylinder
Submerged circular cylinder
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|摘要:||本研究是利用高速攝影機配合影像處理及高速PIV計算技術，輔以流場可視化之定性觀測方法，探討孤立波通過潛沒圓柱之週邊流場特性。文中首先針孤立波通過不同間距圓柱之流場型態進行定性的觀察，再根據觀察結果將其型態分類。而後選擇G/D = 1.5 ~ 5較為相似的型態進行更進一步的定性觀察及定量量測，再根據量測結果對渦流發展過程之速度向量分佈、渦心移動特性、渦度分佈及渦流環流量Γ之變化情形進行詳細之探討。
在定性方面，當圓柱接近底床時G/D = 0 ~ 1.5，流場特性與潛堤之流場較為相似。當圓柱離開底床並且未接近水面的範圍，其流場型態相當近似。孤立波通過圓柱後尾端產生兩渦流且不對稱，孤立波遠離後兩渦流斜朝向底板移動，並往波浪入射方向移動。當圓柱接近水面時，渦流流場與G/D = 1.5 ~ 5型態稍微不同，其渦流水平往波浪入射方向移動。
針對G/D = 1.5 ~ 5時之流場進行定量量測，發現孤立波通過位於不同間距圓柱時，其渦流環流量約相同，針對 同一間距條件其下渦流之環流量絕對值皆大於上渦流。在G/D = 1.5 ~ 5時渦流渦心移動軌跡有一近似走向。|
The characteristics of the vortices induced by a solitary wave propagating over a submerged 2-D circular cylinder were investigated experimentally. The wave height (H) is 1.1 cm, and the diameter of the cylinder (D) is 1 cm in the water depth of h = 7 cm. Particle image velocimetry (PIV) and flow visualization techniques were used for the experiments. PIV was based on phantom camera and Argon laser system. Particle trajectory photography was used to observe the flow patterns. The vortex shedding processes were investigated for different gap ratios (G/D) using the qualitative visualization technique and PIV. For different G/D, the flow patterns can be classified as three major flow patterns. For G/D = 0 ~ 1.5, the characteristics of flow field are similar to that behind a submerged dike. For G/D = 1.5 ~ 5, the vortex shedding processes are nearly the same. As a solitary wave passes, two asymmetric vortices are produced behind the cylinder. As the wave moves away from the position over the cylinder, the vortices move toward the bottom boundary. For G/D = 5 ~ 6, the vortex shedding processes are different from those in G/D = 1.5 ~ 5. The vortices move horizontally toward the incoming direction of the solitary wave. For G/D = 1.5 ~ 5, it is found that the flow patterns are nearly the same. The flow patterns were also measured quantitatively using PIV. The characteristics of velocity distribution, trajectories of vortex core and vortex circulation were analyzed. The circulation of the down vortex is always larger than that of the top vortex at each non-dimensional time (T = -5 ~3). The similarity profiles for the variation of the non-dimensional vortex strength are obtained in this paper.
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