Numerical Analysis of Axisymmetric Supercavitating Flows

Ahn, Byoung-Kwon; Jang, Hyun-Gil; Kim, Hyoung-Tae; Lee, Chang-Sup

doi:10.3850/978-981-07-2826-7_156

Cited by 3 publications

(2 citation statements)

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“…This iteration process is repeated until the results converge. All the results were validated by a comparison with existing analytic and empirical solutions through the previous research [4]. In addition, a viscous-potential method was introduced to compensate for the effects of viscosity.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Supercavitating Flows using a Viscous-Potential Method

Kim

Ahn

2015

J. Phys.: Conf. Ser.

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Abstract.A numerical method was developed to predict the supercavity around axi-symmetric bodies. Employing potential flow, the proposed method computes the cavity shape and drag force, which are the important features of practical concern for supercavitating objects. A method to calculate the frictional drag acting on the wetted body surface was implemented, which is called the viscous-potential method. The results revealed details of the drag curve appearing in the course of an increase in speed and cavity growth. In addition, the supercavity and drag features of the actual shape of the supercavitating torpedo were investigated according to the different depth conditions. IntroductionWhen the speed of a submerged body increases and the cavity is sufficient to cover the entire body, it is called a supercavity. The cavity reduces the drag forces acting on the body and can help an underwater vehicle moves faster. This study focused on the cavitator located in front of the body, which generates a cavity and develops it until the natural supercavity covers the entire body. In the field of marine hydrodynamic applications, traditional methods to predict the extent and behavior of a cavity on the surface of a propeller blade are based mostly on the linearized lifting surface theory [1]. The surface panel method was developed to improve the accuracy near the high curvature section [3], [2]. Following that studies, present method distributed the normal dipoles and sources on the cavitator and the cavity surface to solve the supercavitating flow problem generated by various types of cavitators. The normal dipoles and sources on the cavity surface are moved to the newly computed cavity surface, where the boundary conditions are satisfied again. This iteration process is repeated until the results converge. All the results were validated by a comparison with existing analytic and empirical solutions through the previous research [4]. In addition, a viscous-potential method was introduced to compensate for the effects of viscosity.

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Section: Introductionmentioning

confidence: 99%