2016-04-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/687436摘要：本計畫將應用計算方法探討水下載具在不同航行狀況下達到自推時的相關流體力學問題，探討的 相關流力問題包含受力與流場細節。計畫將分為三個子題進行，子題一是水下載具自推模擬：探 討如何應用計算方法模擬模型與實尺寸水下載具在直航與斜航時的自推點，將應用體積力方法進 行載具與螺槳的交互作用模擬，而由於計算量相當大，並將對於計算進行平行化的研究。由於本 計畫的每一項計算皆牽涉大量計算，平行化的研究將橫跨於每一子題。子題二是細節流場影響探 討，將進行水下載具細節流場，尤其是不同渦系形成與發展的模擬與探討。主要在於探討帆罩與 接合面之馬蹄渦與其尾端之尖渦的形成與發展，並對控制翼所形成之渦系在自由液面影響下的渦 系發展進行研究。子題三是流場噪音分析計算：將針對前二子題計算所得流場與受力，進行流場 引發噪音的計算。對於子題二的計算結果，重點在於渦系所引發的噪音，而對於子題一的計算結 果，則專注於螺槳在非定常流中，造成軸系振動，所引發的潛體振動噪音；既然本計畫探討自推 相關問題，此因螺槳非定常入流所造成的噪音勢必不可忽視。相信透過跨領域的計算與驗證，就 水下載具最基本卻複雜的自推進行研究，將可更深入了解水下載具的水動力特性。<br> Abstract: The objective of this proposal is to investigate the flow characteristics of underwater vehicle at self-propulsion point in different inflow conditions. This research includes the predictions of both forces and detailed flows. Three subjects are included in this project. The first one is to simulate the self-propulsion of an underwater vehicle in different courses, and both the model scale and full scale vehicles will be investigated. The body force method is used to compute the interactions between the hull and the propeller. Development of novel parallel algorithms in computations will be carried out to more efficiently solve problems in this subject and other two subjects since large amount of computations are involved in every subject. Subject II is to compute the detailed flow around the underwater vehicle, especially to study the formation and development of different vortex systems. The juncture vortex at the junction of sail and hull, along with the tip vortex of the sail will be mainly investigated in this project. The vortex systems of control surfaces and the influences of the free surface to vortex systems will also be studied. The subject III is to compute and analyze the flow noise. The flow field and forces obtained from both subjects I and II will be used for evaluating the flow noise. For the subject II, the vortices in the computed detailed flow will be used to compute the flow induced noise. For the subject I, due the unsteady inflow of the propeller, the propeller unsteady forces usually cause shaft vibrations. This vibration will transmit to the hull, and induced noise. Because this noise is critical when investigating the self-propulsion problems, it is also included in the proposed project. Both verifications and validations will be made for all computational results. It is believed that by combining different computational methods, we can understand more hydrodynamics of underwater vehicles through investigating this fundamental but complicated self-propulsion problem.水下載具潛艇自推馬蹄渦尖渦流體噪音Underwater vehiclesubmarineself-propulsionhorseshoe vortextip vortexflow noise