禹旻, 袁湘江, 朱志斌. 高超声速壁湍流入口条件生成方法的比较[J]. 空气动力学学报, 2017, 35(6): 772-776. DOI: 10.7638/kqdlxxb-2015.0177
引用本文: 禹旻, 袁湘江, 朱志斌. 高超声速壁湍流入口条件生成方法的比较[J]. 空气动力学学报, 2017, 35(6): 772-776. DOI: 10.7638/kqdlxxb-2015.0177
YU Min, YUAN Xiangjiang, ZHU Zhibin. Assessment of inflow boundary conditions for hypersonic wall bounded turbulent flows[J]. ACTA AERODYNAMICA SINICA, 2017, 35(6): 772-776. DOI: 10.7638/kqdlxxb-2015.0177
Citation: YU Min, YUAN Xiangjiang, ZHU Zhibin. Assessment of inflow boundary conditions for hypersonic wall bounded turbulent flows[J]. ACTA AERODYNAMICA SINICA, 2017, 35(6): 772-776. DOI: 10.7638/kqdlxxb-2015.0177

高超声速壁湍流入口条件生成方法的比较

Assessment of inflow boundary conditions for hypersonic wall bounded turbulent flows

  • 摘要: 给定恰当的入口条件是开展壁湍流数值模拟的关键问题。选取基于有限差分的直接数值模拟方法结合高精度的计算格式,详细讨论了自然转捩、波纹壁面结构导致的“Bypass”转捩和利用时间发展湍流场进行参数回收促发转捩这几种湍流入口生成方法在高超声速条件下的可行性,分析了这几种方法各自存在的优点和不足之处。计算结果表明,Bypass转捩和利用时间发展流场进行参数回收方法相比自然转捩能快速促发转捩,但自然转捩得到的湍流场品质更好。该项研究为高马赫数壁湍流数值模拟入口条件的选取提供参考依据。

     

    Abstract: It is critically important to generate turbulent fluctuating inflow boundary conditions for numerical simulation in solving hypersonic turbulent boundary layers. A high-order finite-difference method was applied to investigate the inflow generation methods. Turbulent inflow boundary conditions are broadly classified into natural transition methods, recycling/rescaling-based methods, and synthetic turbulence generators. To investigate the feasibility of inflow generation methods at high Mach number, the simulation of a Mach 6 boundary layer over an isothermal flat plate was carried out. The validity and limitations of different inflow boundary conditions were also discussed. Several feasible methods were studied in great detail including natural transition from laminar to turbulent flows, bypass transition induced by wavy wall configuration, and turbulence generation via reintroducing the flow field obtained from temporal developing turbulent flow. The limitation of the recycling/rescaling method was also proposed in hypersonic flow condition. By analyzing the flow filed and statistical results, we summarized and discussed the advantages and drawbacks about these inflow generation approaches, and further assessed these methods. Compared with natural transition method, bypass transition method and reintroducing method can promote transition to turbulent flow field efficiently. But turbulent field has better quality generated by natural transition route. The paper can be a reference of imposing an inflow boundary condition for wall bounded turbulent flows at high Mach number.

     

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