Assessment of SAS and PANS models in simulations of flow over a circular cylinder

LIU Yue; GUAN Xiaorong; XU Cheng

doi:10.7638/kqdlxxb-2017.0072

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Assessment of SAS and PANS models in simulations of flow over a circular cylinder

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- Assessment of SAS and PANS models in simulations of flow over a circular cylinder
- Vol. 37, Issue 4, Pages: 530-540(2019)
- 作者机构：
  
  南京理工大学机械工程学院,南京,210094
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2017.0072
  CLC： TJ011.2;V211.3
- Published：2019
- 稿件说明：
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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.

摘要

分别运用SST（Shear Stress Transport）、SST-SAS（Scale-Adaptive Simulation）、两种变

（模化湍动能的比例）函数的SST-PANS（Partially Averaged Navier-Stokes）湍流模型对

=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

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

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

函数构造相对简单，所得

分布更准确，使用tanh函数计算的尾迹区

值偏低，对流场调控能力稍差。

Abstract

Flow past a circular cylinder at

=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

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

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

function with DES method has a simple structure and provides a reasonable

distribution

while the

function with tanh method obtains a low level

distribution in the wake area

corresponding to its inadequate capabilities in adjusting the solution scales of separated flows.

关键词

Keywords

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