北京航空航天大学学报

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DDES方法不同延迟函数在超声速底部流动中的性能研究

杜若凡1,闫超1,韩政1,向星皓2,屈峰3   

  1. 1. 北京航空航天大学航空科学与工程学院
    2. 中国空气动力研究与发展中心
    3. 中国空间技术研究院
  • 收稿日期:2016-07-15 修回日期:2016-09-12 发布日期:2016-11-02
  • 通讯作者: 杜若凡
  • 基金资助:
    国家自然科学基金

Studies on the performance of different delayed functions in DDES method for the simulation of supersonic base flow

  • Received:2016-07-15 Revised:2016-09-12 Published:2016-11-02

摘要: 围绕DDES方法中不同延迟函数开展研究工作,选取超声速底部流动作为测试算例,通过与实验数据的系统对比分析,考察不同延迟函数在超声速分离流动中的分布规律、作用效果及模型求解能力。计算结果表明:DDES-F2保护范围最大,但其较大的RANS区域使得较多湍流尺度被模化,模型求解能力受到影响,计算结果中小尺度结构偏少,湍流脉动明显低于实验值。DDES-Fd结果中RANS区域最小,所得分离区回流速度与实验十分接近,但在部分站位预测的速度脉动过强。DDES-F1对该流动较为有效,能够在起到保护作用的同时不损害模型的求解精度,所得结果与实验数据吻合较好。

关键词: DDES, 超声速底部流动, 延迟函数, 湍流, 计算流体动力学

Abstract: The research focuses on the different delayed functions in the delayed detached eddy simulation (DDES) methods by employing the supersonic base flow as the validation case. Through systematic comparisons with the experimental data and detailed analyses, the distributions and shielding behaviors of different delayed functions together with resolving capabilities of different models are investigated. Results show that DDES-F2 provides protection in the largest area, leading to a large RANS region with a great deal of turbulent scales being modeled. Therefore, the resolving capabilities of the model are inhibited, resulting in fewer small-scale flow structures and lower turbulent fluctuations than the measurements. On the contrary, DDES-Fd obtains the smallest RANS region, and the predicted backflow velocity agrees well with the experimental data in the recirculation region, while the intensity of velocity fluctuations are overpredicted at some locations. DDES-F1 behaves appropriately in this supersonic separated flow and reproduces the experimental data very well, providing sufficient protection without impairing the model’s numerical accuracy.

Key words: delayed detached eddy simulation (DDES), supersonic base flow, delayed functions, turbulence, computational fluid dynamics (CFD)

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