Computation of Transonic Turbulent Flow Around a Blunt Nosed Short Body at Large Angle of Attack
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摘要: 采用数值模拟求解N-S方程方法计算与分析了绕大钝头短体外形的跨音速大迎角时的湍流流动.数值方法中选用Van Leer 分裂格式离散无粘通量项,并构造了一种Limiter函数以保证TVD(Total Variation Diminishing)性质,采用中心差分格式来离散粘性通量项.计算中采用了B-L湍流模型.算例定性地表明绕流的三维分离具有准周期性的非定常特性.Abstract: The transonic turbulent flow around a blunt nosed and short body at large angle of attack was calculated and analysed by using numerical simulation method to solve the full N-S equations. In the computation, Van Leer's scheme was used to discretize the inviscid flux terms and a new limiter function was constructed to realize TVD character. The viscous flux terms were discretized by using a central difference scheme. The Baldwin-Lomax turbulent model was used in the viscous terms. Numerical results qualitatively show that the separated flow has an unsteady quasi-periodic character.
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Key words:
- transonic velocity /
- separated flow /
- non-steady flow /
- a blunt nosed short body
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