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在跨流域复杂流动问题的模拟中, 基于求解速度分布函数演化方程的气体动理论方法的效率问题一直受到工程应用领域关注. 研究提升气体动理论方法在定常流动模拟中的计算效率具有重要意义. 为了提升定常流动计算收敛速度, 本文提出了一种耦合宏观方程数值本构关系的气体动理论加速收敛方法. 通过求解Boltzmann模型方程, 将应力、热流高阶项的数值解与宏观方程耦合, 实现了宏观方程的封闭; 另一方面, 宏观方程的计算结果被用来更新Boltzmann模型方程的当地平衡态速度分布函数中的宏观物理量, 以此构造求解Boltzmann模型方程的全隐式数值格式. 通过跨流域方腔流动、超声速圆柱绕流及双圆柱干扰绕流案例的数值模拟, 对方法进行了广泛考核. 计算结果与常规气体动理论统一算法、直接模拟蒙特卡罗法符合良好, 证明该方法很好地描述了稀薄流动中的非线性本构关系, 以及激波、强壁面剪切、流动分离等强非平衡特征. 进一步, 对于低努森数Kn的流动, 方法能显著加速收敛过程, 提升计算效率; 随着努森数Kn增加, 气体对流输运效应减弱, 方法的加速收敛效果降低. 与此同时, 如何减少内迭代耗时, 进一步提升效率有待更多研究.
In the simulation of complex multi-scale flows covering various flow regimes, the computational efficiency of gas kinetic method by which the evolution equation of velocity distribution function is solved directly is the key to engineering applications. In order to accelerate simulation for steady flows, a gas kinetic algorithm accelerated by utilizing the macroscopic conservative equations with a digital constitutive relation is developed. In this algorithm, the contribution of the high-order terms of stress and heat flux in macroscopic conservative equations is determined by the gas kinetic solution. Meanwhile, the solution of the macroscopic conservative equations provides the macroscopic quantities for the equilibrium distribution function in the Boltzmann model equation, where a fully implicit scheme to solve the Boltzmann model equation is developed. Extensive validations are performed for the cavity flow, the supersonic flow around the cylinder, and the interactive rarefied flow around two side-by-side cylinders. The results from the above method are in good agreement with the results from the conventional gas kinetic unified algorithm and the direct simulation Monte Carlo method. It can be concluded that the nonlinear constitutive relation of rarefied flow can be well captured by the present method. And the ability of this method to simulate complex flows such as shock wave, strong wall shear and flow separation is demonstrated. Furthermore, the present method has shown to be much faster than the conventional gas kinetic unified algorithm, especially for the low-Kn flows. As the value of Kn increases, the acceleration rate decreases, because the effect of flow convection becomes weak. Meanwhile, more effort is needed to reduce inner loop iterations to improve its efficiency. -
Keywords:
- gas kinetic unified algorithm /
- constitutive relation /
- convergence accelerated method /
- coupled method
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图 1 方腔流温度分布计算结果 (a) Kn = 1 ; (b) Kn = 0.075; (c) Kn = 0.01 (GKUA: 彩色背景及黑色实线; Coupled: 红色虚线)
Fig. 1. Temperature distribution in cavity flow: (a) Kn = 1; (b) Kn = 0.075; (c) Kn = 0.01 (GKUA: coloured background and black solid lines; Coupled: red dashed lines).
图 2 方腔中心线上的速度场 (a) Kn = 1; (b) Kn = 0.075; (c) Kn = 0.01
Fig. 2. Velocity profiles at the central lines of the cavity: (a) Kn = 1; (b) Kn = 0.075; (c) Kn = 0.01.
图 3 耦合加速收敛方法与常规GKUA的计算收敛历史
Fig. 3. The convergence history between coupled acceleration method and the conventional GKUA.
图 4 Kn = 0.01圆柱绕流流场对比 (a) 压力; (b) 温度; (c) 马赫数 (GKUA: 彩色背景及白实线; Coupled: 红色虚线)
Fig. 4. (a) Pressure, (b) temperature, (c) Mach number distribution around cylinder for Kn = 0.01 (GKUA: coloured background and white solid lines; Coupled: red dash lines).
图 5 Kn = 0.1圆柱绕流流场对比 (a) 压力; (b) 温度; (c) 马赫数(GKUA: 彩色背景及白实线; Coupled: 红色虚线)
Fig. 5. (a) Pressure, (b) temperature, (c) Mach number distribution around cylinder for Kn = 0.1 (GKUA: coloured background and white solid lines; Coupled: red dash lines).
图 6 圆柱壁面的 (a) 压力, (b) 热流, (c) 剪切应力
Fig. 6. (a) Pressure, (b) heat flux, and (c) shear stress profile along the wall surface of cylinder.
图 7 耦合加速收敛方法与常规GKUA的超声速圆柱绕流计算收敛情况对比
Fig. 7. Comparison of the convergence history of supersonic flow around the cylinder between the coupled acceleration method and the conventional GKUA.
图 9 并列双圆柱绕流流场对比 (a) 压力; (b) 温度; (c) 马赫数(GKUA: 彩色背景及白实线; Coupled: 红色虚线)
Fig. 9. (a) Pressure, (b) temperature, (c) Mach number field for two side-by-side cylinders (GKUA: coloured background and white solid lines; Coupled: red dash lines).
图 10 上圆柱壁面的 (a) 压力, (b) 热流, (c) 剪切应力
Fig. 10. (a) Pressure, (b) heat flux, and (c) shear stress profile along the surface of upper cylinder.
图 11 耦合加速收敛方法与常规GKUA的并列双圆柱超声速绕流计算收敛情况对比
Fig. 11. Comparison of the convergence history of supersonic flow around two side-by-side cylinders between the coupled acceleration method and the conventional GKUA.
表 1 耦合加速收敛方法与常规GKUA的收敛情况对比
Table 1. Convergence comparison between the conventional GKUA and the coupled acceleration method.
Kn 迭代步数(收敛标准: 10–7) 加速比 GKUA Coupled 0.010 8000 170 47.00 0.075 2300 300 7.60 1.000 1200 1100 1.09 
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[1] Cercignani C 1988 The Boltzmann Equation and its Applications (New York: Springer) pp40−103
[2] Kremer G M 2010 An Introduction to the Boltzmann Equation and Transport Processes in Gases (Berlin: Springer) pp37−80
[3] Shakhov E M 1968 Fluid Dyn. 3 95
[4] Brull S, Schneider J 2009 Cont. Mech. Thermodyn. 20 489
Google Scholar
[5] Broadwell J 1964 J. Fluid Mech. 19 401
Google Scholar
[6] Huang A B, Huang P F, Giddens D P, Srinivasan R 1973 Phys. Fluids 16 814
Google Scholar
[7] 李志辉 2001 博士学位论文 (绵阳: 中国空气动力研究与发展中心)
Li Z H 2001 Ph. D. Dissertation (Mianyang: China Aerodynamics Research and Development Center) (in Chinese)
[8] Li Z H, Zhang H X 2004 J. Comput. Phys. 223 708
[9] Li Z H, Zhang H X 2008 Int. J. Comput. Fluid Dyn. 22 623
Google Scholar
[10] Li Z H, Zhang H X 2009 J. Comput. Phys. 228 1116
Google Scholar
[11] Xu K, Huang J C 2010 J. Comput. Phys. 229 7747
Google Scholar
[12] Jin S, Wang L 2013 SIAM J. Sci. Comput. 35 799
Google Scholar
[13] Jin S 1999 SIAM J. Sci. Comput. 21 441
Google Scholar
[14] Gu X J, Emerson D R 2011 Microfluid. Nanofluid. 10 389
Google Scholar
[15] 许爱国, 张广财, 李英骏, 李华 2014 物理学进展 34 136
Google Scholar
Xu A G, Zhang G C, Li Y J, Li H 2014 Prog. Phys. 34 136
Google Scholar
[16] 许爱国, 张广财, 应阳君 2015 64 184701
Google Scholar
Xu A G, Zhang G C, Ying Y J 2015 Acta Phys. Sin. 64 184701
Google Scholar
[17] Li Z H, Peng A P, Zhang H X, Yang J Y 2015 Prog. Aerosp. Sci. 74 81
Google Scholar
[18] Li Z H, Peng A P, Ma Q, Dang L N, Tang X W, Sun X Z 2019 Adv. Aerodyn. 1 1
Google Scholar
[19] 彭傲平 2017 博士学位论文 (绵阳: 中国空气动力研究与发展中心)
Peng A P 2017 Ph. D. Dissertation (Mianyang: China Aerodynamics Research and Development Center) (in Chinese)
[20] 李志辉, 梁杰, 李中华, 李海燕, 吴俊林, 戴金雯, 唐志共 2018 空气动力学学报 36 826
Google Scholar
Li Z H, Liang J, Li Z H, Li H Y, Wu J L, Dai J W, Tang Z G 2018 Acta Aerodynam. Sin. 36 826
Google Scholar
[21] 吴俊林 2018博士学位论文 (绵阳: 中国空气动力研究与发展中心)
Wu J L 2018 Ph. D. Dissertation (Mianyang: China Aerodynamics Research and Development Center) (in Chinese)
[22] Mieussens L 2000 J. Comput. Phys. 162 429
Google Scholar
[23] Chen S Z, Xu K, Lee C B, Cai Q D 2012 J. Comput. Phys. 231 6643
Google Scholar
[24] 江定武 2016 博士学位论文 (绵阳: 中国空气动力研究与发展中心)
Jiang D W 2016 Ph. D. Dissertation (Mianyang: China Aerodynamics Research and Development Center) (in Chinese)
[25] Li Z H, Bi L, Tang Z G 2009 Appl. Math. Mech.-Engl. 30 889
Google Scholar
[26] Peng A P, Li Z H, Wu J L, Jiang X Y 2016 J. Comput. Phys. 327 919
Google Scholar
[27] Hu W Q, Li Z H 2018 Comput. Math. Appl. 75 4179
Google Scholar
[28] Rovenskaya O, Croce G 2014 Vacuum 109 266
Google Scholar
[29] Valougeorgis D, Naris S 2003 SIAM J. Sci. Comput. 25 534
Google Scholar
[30] Zhu Y J, Zhong C W, Xu K 2017 Phys. Fluids 29 096102
Google Scholar
[31] Zhu Y J, Zhong C W, Xu K 2016 J. Comput. Phys. 315 16
Google Scholar
[32] Jin S, Slemrod M 2001 J. Stat. Phys. 103 1009
Google Scholar
[33] Struchtrup H, Torrilbon M 2003 Phys. Fluids 15 2668
Google Scholar
[34] Xiao H, Tang K 2017 Sci. Rep. 7 13108
Google Scholar
[35] Myong R S 2001 J. Comput. Phys. 168 47
Google Scholar
[36] 陈伟芳, 赵文文 2017 稀薄气体动力学矩方法及数值模拟 (北京: 科学出版社) 第1—16页
Chen W F, Zhao W W 2017 Moment Method and Numerical Simulation on Rarefied Gas Dynamics (Beijing: Science Press) pp1–16 (in Chinese)
[37] Su W, Zhu L H, Wang P, Zhang Y H, Wu L 2020 J. Comput. Phys. 407 109245
Google Scholar
[38] Adams M L, Larsen E W 2002 Prog. Nucl. Energy 40 3
Google Scholar
[39] Zhu L H, Pi X C, Su W, Li Z H, Zhang Y H, Wu L 2020 arXiv: 2004.10530 v [physics. comp-ph]
[40] Guo Z L, Xu K, Wang R J 2013 Phys. Rev. E 88 033305
Google Scholar
[41] Guo Z L, Wang R J, Xu K 2015 Phys. Rev. E 91 033313
Google Scholar
[42] Li X L http://pan.baidu.com/s/1 slfC5 Yl [2020-6-6]
[43] Kudryavtsev A N, Shershnev A A 2013 J. Sci. Comput. 57 42
Google Scholar
[44] 沈青 2003 稀薄气体动力学 (北京: 国防工业出版社) 第105−110页
Shen Q 2003 Rarefied Gas Dynamics (Beijing: National Defense Industry Press) pp105−110 (in Chinese)
[45] Yang L M, Chen Z, Shu C, Yang W M, Wu J, Zhang L Q 2018 Phys. Rev. E 98 063313
Google Scholar
[46] Bird G A 2005 Proceedings of the 24th International Symposium on Rarefied Gas Dynamics Bari, Italy, July 10−16, 2004 p541
[47] Zhu L H, Guo Z L, Xu K 2016 Comput. Fluids 127 211
Google Scholar
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