| In the case of huge consumption of land resources, people gradually turn their attention to the ocean. As we all know, the area of the ocean is 71 percent of Earth's surface, the ocean, which contains much more resources than mainland, is a great treasure trove of resources. From ancient times, people get fish, pearls, edible algae and so on from the ocean. Because of oil and gas resources shortage, people are eager to explore and develop these resources from the sea. To investigate the details of these resources, a variety of underwater technologies emerge as the times require. Underwater towed system, which is mainly used in marine monitoring, marine research, military detection devices, plays a vital role in the marine research and even national defense construction.Using the standard k-εtwo-equation model of CFD to study the hydrodynamic conditions of underwater towed vehicle body and its fins.This article consists of three parts:the single underwater towed vehicle design, fin design and double body design.In this paper, there are so many models to calculate, and it takes too long to manually do all the work by Gambit. Considering the easy operability of Journal files provided by Gambit, it's better to use VB6.0 to set up models. In order to guarantee the quality of grid, the models are processed by block processing, which utilizes structured grid as much as possible. Some parameters have been set to control the quality of grid. The main advantage of this method is that the time of modeling and meshing scales down more than ten times. The more complex the models are, the more obvious the advantages are. The parallel computing and other methods have been introduced to speed up the calculation of Fluent.During the single body hull design, three kinds of revolving hull of underwater towed vehicle are used, respectively is Myring type, Submarine type and Torpedo type. The variation of the resistance, related charts and data are obtained by changing of parameters of the curve equation, An optimized underwater towed vehicle hull can be designed by using these charts and data.NACA0015 type fin section is used to imitate the submarine to design the bow fin and caudal fin. Then the data of lift force and resistance of bow fin and caudal fin can be gained when they are at different angle of attack, respectively is 0,2,4,6,8 and 10 degree. The research indicated that when the angle of attack increases, the lift and the drag are increasing, and the lift increases more than the drag. Taking the Myring hull as an example, this paper puts the bow fin and caudal fin together and analyzes its resistance when Reynolds number is 1.99×106,3.98×106,5.97×106,7.96×106, respectively.In the double body design, the body uses Submarine hull and section plane between two bodies uses NACA0012 type. Setting two body distance as 150,200,300,400,500 mm, respectively, this article studys the resistance of two bodies when Reynolds number respectively is 1.99×106,4.98×106,7.96×106, then it compares velocity nephograms of the single body with that of double body.Underwater towed vehicle, which is design by this article, can also be applied in other domains, like AUV, submarine, torpedo and so on.
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