南京理工大学 机械工程学院,南京,210094
刘跃(1987-), 男, 博士, 主要从事湍流预测和气体动力学数值研究工作.E-mail:lynefo@126.com
管小荣(1979-), 男, 博士, 副研究员, 主要从事湍流预测和气体动力学数值研究工作.E-mail:18652096966@163.com
纸质出版:2019
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刘跃, 管小荣, 徐诚. SAS与PANS模型在圆柱绕流中的应用比较[J]. 空气动力学学报, 2019, 37(4): 530-540.
LIU Yue, GUAN Xiaorong, XU Cheng. Assessment of SAS and PANS models in simulations of flow over a circular cylinder[J]. 2019, 37(4): 530-540.
刘跃, 管小荣, 徐诚. SAS与PANS模型在圆柱绕流中的应用比较[J]. 空气动力学学报, 2019, 37(4): 530-540. DOI: 10.7638/kqdlxxb-2017.0072.
LIU Yue, GUAN Xiaorong, XU Cheng. Assessment of SAS and PANS models in simulations of flow over a circular cylinder[J]. 2019, 37(4): 530-540. DOI: 10.7638/kqdlxxb-2017.0072.
分别运用SST(Shear Stress Transport)、SST-SAS(Scale-Adaptive Simulation)、两种变
f
k
(模化湍动能的比例)函数的SST-PANS(Partially Averaged Navier-Stokes)湍流模型对
Re
=3900的圆柱绕流进行了数值研究,重点从湍流结构捕捉、气动力计算、涡黏性控制等方面,比较了SAS与PANS两类RANS/LES混合模型的计算能力,并通过不同网格计算分析了模型的网格敏感性。数值结果表明:SAS及两种变
f
k
方法的PANS模型均具有求解小尺度涡运动的能力,并能较好地反映出绕流尾迹的三维非定常特性,同时PANS模型能捕捉到更多的非定常结构;SAS模型中自适应尺度
L
vk
立足于当地流动,对网格依赖较小,计算的湍动粘度分布更合理,能够更好地计算剪切层及回流区;两种PANS模型网格独立性较差,出现了雷诺应力不足的现象;类DES可变
f
k
函数构造相对简单,所得
f
k
分布更准确,使用tanh函数计算的尾迹区
f
k
值偏低,对流场调控能力稍差。
Flow past a circular cylinder at
Re
=3900 is simulated using shear stress transport (SST) model
scale-adaptive simulation (SST-SAS) model and partially averaged Navier-Stokes (PANS) model with two various
f
k
methods. The SAS and PANS models as recently proposed hybrid strategies are significantly investigated. The model performance is assessed by a detailed comparison of p
redictions regarding the turbulence characteristics
the aerodynamic characteristics
and the distribution of eddy-viscosity. Moreover
the grid-sensitivity of different models is also investigated using two grids. From the assessment
it is confirmed that the SAS and PANS models have the abilities to calculate the small-scale motions
and both models can be employed to predict the unsteady characteristics of wake vortices advantageously. Both the two PANS models can capture complex flow structures and physics mechanism; and the SAS model using the
L
vk
scale with features of local-adaptive and grid-independent can predict the eddy-viscosity reasonable. Therefore
the SAS model reproduce the shear layers and recirculation zone more accurately. Both the two PANS methods appear obvious grid-dependency
and the issue of modeled-stress depletion (MSD) is evoked with the fine grid. The
f
k
function with DES method has a simple structure and provides a reasonable
f
k
distribution
while the
f
k
function with tanh method obtains a low level
f
k
distribution in the wake area
corresponding to its inadequate capabilities in adjusting the solution scales of separated flows.
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