船模試驗中觀察船體表面的流場分佈，在船舶設計中為相當重要的一環，根據流場分佈所得到的資訊，可以評估船體設計是否符合期待，進而修改達成減阻之目的，因此本研究著重於流場可視化，利用美國大衛泰勒實驗室(DTRC)繪製DARPA SUBOFF之潛艦縮尺模型，並利用3D列印方式建立實體船模，於空蝕水槽中以油墨實驗進行流場可視化實驗，觀測潛艦斜航與俯仰時，在多種攻角對應不同流速下裸船以及加入附屬物(包括帆罩、尾舵)之複雜流場現象，並分析潛艦表面之渦流、紊流及邊界層分離等情況下之油墨軌跡，以獲得流體通過潛艦表面時的流場現象，並探討不同類型的帆罩對潛艦流場之影響。
比較不同類型的帆罩以SUBOFF型帆罩與Seawolf型帆罩為主，Seawolf型的帆罩在前端增加了填角弧形，並由油墨實驗結果發現，增加的填角弧形有效的減弱帆罩前方所產生的馬蹄型渦流，在潛艦斜航時也有效的減弱帆罩側翼的邊界層分離，根據以上結果本實驗系統，可提供潛艦在設計上一快速分析流場特性的概念。

In the ship model test, the flow field distribution on the surface of the hull is observed, which is a very important part of the ship design, According to the information obtained from the flow field distribution, it is possible to evaluate whether the hull design meets expectations, and then modify it to achieve the purpose of drag reduction, so this study focuses on the visualization of the flow field, using the David Taylor Research Center of the United States to draw the scale model of the DARPA SUBOFF submarine, and using the 3D printing method to establish a solid ship model, and conduct the flow visualization experiment in the cavitation tank with the ink paint test. Observing the complex flow field phenomena of the bare hull and adding appendages (including sail and rudder) at various angles of attack and different flow speed when the submarine is yawed and pitched, and analyzing the vortex flow, turbulence, and boundary layer separation on the surface of the submarine. To obtain the flow field phenomenon when the fluid passes through the surface of the submarine, and explore the influence of different types of sail covers on the flow field of the submarine.
Different types of sail are compared SUBOFF sail and Seawolf type sail. Seawolf sail has a leading edge strake at the front end, and the ink paint test results show that the added leading edge strake can effectively weaken the horseshoe vortex generated in front of the sail. The boundary layer separation of the sail flanks is also effectively weakened when the submarine is yawed. According to the above results, this experimental system can provide the concept of rapid analysis of the flow field characteristics in the design of the submarine.

Ashok, A., Van Buren, T., & Smits, A. J. (2015). The structure of the wake generated by a submarine model in yaw. Experiments in Fluids, 56(6), 1-9.

Burcher, R., & Rydill, L. J. (1995). Concepts in submarine design (Vol. 2). Cambridge university press

Groves, N. C., Huang, T. T., & Chang, M. S. (1989). Geometric characteristics of DARPA (Defense Advanced Research Projects Agency) SUBOFF models (DTRC model numbers 5470 and 5471). David Taylor Research Center Bethesda MD Ship Hydromechanics Dept.

Jiménez, J. M., & Smits, A. J. (2011). Tip and junction vortices generated by the sail of a yawed submarine model at low Reynolds numbers. Journal of fluids engineering, 133(3).

Langston, L., & Boyle, M. (1982). A new surface-streamline flow-visualization technique. Journal of Fluid Mechanics, 125, 53-57.

Lee, S., Erm, L., & Jones, M. (2016). Dye Visualisation of Wake Flow around a Model Submarine at Yaw. Proceedings of the 20th Australasian Fluid Mechanics Conference, Perth, Australia,

Liu, Z. H., Xiong, Y., & Tu, C. X. (2014). The method to control the submarine horseshoe vortex by breaking the vortex core. Journal of Hydrodynamics, 26(4), 637-645.

Mohsen Rahmany, A. H. F., & Manshadi, a. M. D. (2016). Experimental Investigation of Effect of the Sail with Leading Edge Fillet on Flow around a Submarine.

Paik, J., Escauriaza, C., & Sotiropoulos, F. (2007). On the bimodal dynamics of the turbulent horseshoe vortex system in a wing-body junction. Physics of Fluids, 19(4), 045107.

Qu, Y., Wu, Q., Zhao, X., Huang, B., Fu, X., & Wang, G. (2021). Numerical investigation of flow structures around the DARPA SUBOFF model. Ocean Engineering, 239, 109866.

Wang, S., Yang, S., He, Z., Li, L., & Xia, Y. (2020). Effect of inclination angles on the local scour around a submerged cylinder. Water, 12(10), 2687.

Ye, Y.-c. (2017). Marine geo-hazards in China. Elsevier.

Federation of American Scientists，SSN-21 Seawolf-class，網址: https://man.fas.org/dod-101/sys/ship/ssn-21.htm，下載日期 : 2022年3月

王柏翔. (2012). 拖航水槽消波裝置改良與船模表面流場可視化之研究，國立成功大學系統及船舶機電工程研究所碩士論文。

何溫庭. (2015). 低展弦比突節翼形流場結構與性能之研究 ，國立成功大學系統及船舶機電工程研究所碩士論文。

莊詠勛. (2014). 以實驗方法探討低展弦具導緣突節翼型之流場結構特性 ，國立成功大學系統及船舶機電工程研究所碩士論文。

陸磐安. (2002). 潛艦概念設計，國立成功大學出版中心。

周一志 (2021) 6:1橢球體流場油墨實驗研究，國立台灣海洋大學系統工程暨造船學系。

國立成功大學系統與船舶機電工程學系流場觀察實驗室，迴轉對稱體邊界流動追跡法【油墨追跡法】實驗手冊。