尺度自适应模拟的网格尺度关联分析  

Grid scale dependence analysis of scale adaptive simulation

作　　者：郑玮琳 庞历瑶 谢凡 阎超[3] 曾文 ZHENG Weilin;PANG Liyao;XIE Fan;YAN Chao;ZENG Wen(School of Aero-Engine,Shenyang Aerospace University,Shenyang 110136,China;AVIC Shenyang Aircraft Design and Research Institute,Shenyang 110035,China;School of Aeronautic Science and Engineering,Beihang University,Beijing 100083,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,沈阳110136 [2]中航工业沈阳飞机设计研究所,沈阳110035 [3]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《北京航空航天大学学报》2021年第1期65-71,共7页Journal of Beijing University of Aeronautics and Astronautics

基　　金：辽宁省博士科研启动基金(2019-BS-185)。

摘　　要：采用尺度自适应模拟(SAS)对雷诺数3900的圆柱绕流展开数值模拟,对比分离涡模拟(DES)的计算结果和已有文献中的实验数据,系统研究了SAS和网格尺度的关联性问题。详细研究了不同网格分辨率和展向计算域的影响,分析了冯卡门尺度在尾迹区的时均湍流统计特性和瞬时分布规律。结果表明:在相同的网格分辨率下,SAS预测的回流区长度小于大涡模拟(LES),表现出较早的剪切层失稳;网格加密后,SAS预测的回流速度增大、雷诺应力峰值降低,计算结果与Lourenco&Shih的实验结果相接近。此外,在相同网格分辨率下改变展向计算域大小对SAS结果的影响很小。对SAS的网格尺度关联分析可以为该方法的工业应用提供指导。Scale Adaptive Simulation(SAS) is used to study the flow around a circular cylinder at Reynolds number 3 900. SAS predictions are compared with the popular Detached Eddy Simulation(DES) and existing experimental data. The effect of grid resolution and spanwise domain size on SAS model performance are systematically analyzed, time-averaged turbulent statistics and instantaneous distributions of the von Karman length scale in the wake region are discussed in detail. It is concluded that the recirculation length of SAS is smaller than that of Large Eddy Simulation(LES) under the same grid resolution, indicating an earlier onset of instability in shear layer. Velocity magnitude inside the recirculation bubble increases and the peak value of Reynolds stress decreases with grid refinement for SAS simulation, which are in good agreement with the experimental data of Lourenco & Shih. Additionally, changing the spanwise domain size with the same resolution has little effect on SAS predictions. The investigations on the influence of grid resolution and the spanwise domain size on SAS model performance can provide guidance for industrial applications of the SAS method in future.

关 键 词：尺度自适应模拟(SAS) 冯卡门尺度 网格尺度 钝体绕流 大分离流动 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程] TB126[理学—工程力学]