Improvement of Delayed-Detached Eddy Simulation Applied to Separated Flow Over Missile Fin
Improvement of Delayed-Detached Eddy Simulation Applied to Separated Flow Over Missile Fin
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DOI：
10.2514/1.37742
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发表时间：
2009-02
期刊：
影响因子：
2.5
通讯作者：
Jacques Riou;E. Garnier;S. Deck;C. Basdevant
中科院分区：
文献类型：
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作者：
Jacques Riou;E. Garnier;S. Deck;C. Basdevant
本文对迎角为25 °时，50 °后掠导弹尾翼绕流进行了数值模拟。对于这样的攻角，气流预计会完全分离。尽管如此，雷诺平均纳维尔-斯托克斯计算仍然预测前缘涡的存在。然后，混合雷诺平均Navier-Stokes/大涡模拟方法进行了评估。特别是，本研究的重点是延迟分离涡模拟，并建议扩展这种方法（EDDES），其目的是加速破坏的涡粘性在大涡模拟区域。这两种方法进行了评估的情况下，边界层流动，它表明，扩展的延迟分离涡模拟的延迟分离涡模拟方法的行为。然而，在一个完全分离的情况下，从一个面向后的台阶下游，与延迟分离涡模拟计算的延迟分离涡模拟方法得到的解决波动与实验数据更好的协议。最后，这两种方法改进了对导弹尾翼流动的描述，预测了完全分离的流动。然而，扩展的延迟分离涡模拟确保了比延迟分离涡模拟更快地发展不稳定性，并且与用压敏涂料获得的压力分布的一致性更好，与延迟分离涡模拟的拟议修改。
This paper presents computational simulations of the flow over a 50-deg sweep missile fin for an angle of attack equal to 25 deg. For such an angle of attack, the flow is expected to fully separate. Nevertheless, Reynolds-averaged Navier-Stokes computations still predict the presence of a leading-edge vortex. Then, hybrid Reynolds-averaged Navier-Stokes/large eddy simulation methods are assessed. In particular, this study focuses on the delayed-detached eddy simulation and on a proposed extension of this method (EDDES), in which the objective is to accelerate the destruction of the eddy viscosity in large eddy simulation regions. These two methods are assessed in the case of a boundary-layer flow, and it is shown that the extended delayed-detached eddy simulation behaves as the delayed-detached eddy simulation method. Nevertheless, in the case of a fully separated flow downstream from a backward facing step, the resolved fluctuations obtained with the extended delayed-detached eddy simulation method are in better agreement with the experimental data than those of the delayed-detached eddy simulation computation. Finally, these two methods improve the description of the flow over the missile fin, predicting a fully separated flow. However, the extended delayed-detached eddy simulation ensures a faster development of instabilities than the delayed-detached eddy simulation and the agreement with the pressure distribution obtained with pressure sensitive paint is much better with the proposed modification of delayed-detached eddy simulation.