Reynolds shear stress modeling in turbulent boundary layers subject to very strong favorable pressure gradient
Reynolds shear stress modeling in turbulent boundary layers subject to very strong favorable pressure gradient
复制标题
受非常强的有利压力梯度影响的湍流边界层的雷诺剪应力模型
DOI：
10.1016/j.compfluid.2020.104494
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Araya, Guillermo
中科院分区：
文献类型：
--
作者：
Saltar, German;Araya, Guillermo
最近对具有高空间/时间分辨率的非常强的有利压力梯度（FPG）的湍流边界层进行的数值预测（即直接数值模拟（DNS））表明，雷诺剪应力有意义地减弱，并具有较长的对数行为[1，2]。在本研究中，评估的剪切应力传输和Spalart-Allmaras湍流模型（以下简称SST和SA，分别）在雷诺平均Navier-Stokes（RANS）模拟。主要目的是评估流行的湍流模型在捕获的特性功能，目前在高加速湍流边界层的准层流现象的能力。有利的压力梯度由顶部收敛面（下沉流）和近似恒定的加速参数K= 4.0× 10− 6来确定。RANS结果的验证是通过大型DNS数据集进行的[1]。一般来说，SA湍流模型已证明是准确性和快速适应湍流入流条件之间的最佳折衷。湍流模型正确地捕捉了高加速流中的自由度和摩擦速度的增加趋势;然而，它们未能再现表面摩擦系数的减小行为，这在准层流化过程的早期阶段是典型的。这两个模型都显示出对雷诺剪应力的递减和对数行为的预测不足，并且显着高估了受到非常强的FPG的湍流边界层中湍流动能（TKE）的产生。
Recent numerical predictions of turbulent boundary layers subject to very strong Favorable Pressure Gradient (FPG) with high spatial/temporal resolution, ie Direct Numerical Simulation (DNS), have shown a meaningful weakening of the Reynolds shear stresses with a lengthy logarithmic behavior [1, 2]. In the present study, assessment of the Shear Stress Transport and Spalart-Allmaras turbulence models (henceforth SST and SA, respectively) in Reynolds-averaged Navier-Stokes (RANS) simulations is performed. The main objective is to evaluate the ability of popular turbulence models in capturing the characteristic features present during the quasi-laminarization phenomenon in highly accelerating turbulent boundary layers. A favorable pressure gradient is prescribed by a top converging surface (sink flow) with an approximately constant acceleration parameter of K= 4.0× 10− 6. Validation of RANS results is carried out by means of a large DNS dataset [1]. Generally speaking, the SA turbulence model has demonstrated the best compromise between accuracy and quick adaptation to the turbulent inflow conditions. Turbulence models properly captured the increasing trend of the freestream and friction velocity in highly accelerated flows; however, they fail to reproduce the decreasing behavior of the skin friction coefficient, which is typical in early stages of the quasi-laminarization process. Both models have shown deficient predictions of the decreasing and logarithmic behavior of Reynolds shear stresses as well as significantly overpredicted the production of Turbulent Kinetic Energy (TKE) in turbulent boundary layers subject to very strong FPG.
登录
查看更多内容
具有压力梯度的湍流边界层的相似性分析：外流
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
L. Castillo;W. George
通讯作者：
W. George
影响因子：
3.7
作者：
B. Launder;W. Jones
通讯作者：
W. Jones
网格拓扑和流动求解器对跨音速翼型湍流模型闭合系数不确定性的影响
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
John A. Schaefer;S. Hosder;M. Mani;A. Cary;Joshua A. Krakos
通讯作者：
Joshua A. Krakos
非结构化网格复杂几何形状周围可压缩流的湍流模型评估
影响因子：
1.9
作者：
Araya, Guillermo
通讯作者：
Araya, Guillermo
生成 RANS 模拟的湍流边界层流入
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
A. Rona;M. Grottadaurea;M. Monti;C. Airiau;Thangasivam Gandhi
通讯作者：
Thangasivam Gandhi