Numerical Study of Supersonic Flows over Blunt Bodies in Water

• Main Authors: Chien-Tzu Chen, 陳建次
• Other Authors: Shen-Min Liang
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/28087378792817938013

碩士 === 國立成功大學 === 航空太空工程學系 === 87 === Supersonic flow over a blunt body in air has been extensively studied in aerospace engineering applications by solving the Euler equations or the Navier-Stokes equations. In this study, we use numerical procedure to investigate a similar problem in water. To numerically simulate this prolem, We use the high-order weighted essentially non-oscillatory scheme (WENO) with a finite volume approach. And the equation of the state for water is described by the Tait equation.The method for the time integration is the non-TVD fourth order Runge-Kutta scheme. Three different blunt bodies are considered. Free stream Mach number ranges from 1.5 to 4.0. The purpose of this study is in two fields: (1) to investigate the difference of the flow field between air and water; (2) to compare the difference between the inviscid and viscous models. It was found that the bow shock location in water is 4.5~6.0 times of that in air, and the bow shock are greatly affected by the body shape in the case of water. The bow shock layer in water is more smeared than that in air, moreover, the numerical representation of the bow shock layer in the viscous flow model is thicker than that in the inviscid flow model.