论文标题
被动标量升级的明确代数关闭：在受系统旋转的加热通道流中的应用
An explicit algebraic closure for passive scalar-flux: Applications in heated channel flows subjected to system rotation
论文作者
论文摘要
我们提出了一个源自张量表示理论的湍流标量频率矢量的代数模型。所得的闭合包含对平均速度梯度的直接依赖性以及构成科里奥利效应的框架旋转张量。模型系数是根据受任意平均标量梯度方向的均质剪切流的直接数值模拟（DNS）数据确定的。这种类型的调整过程使所提出的模型是针对不均匀应用的客观的。模型性能在固定框架和旋转帧的几个加热通道流中进行评估，显示出良好的结果。为了将提出的模型的性能置于上下文中，我们将其与Younis代数模型进行比较，该模型已知可以为多种工程流提供合理的预测。
We present an algebraic model for turbulent scalar-flux vector that stems from tensor representation theory. The resulting closure contains direct dependence on mean velocity gradients and on frame rotation tensor that accounts for Coriolis effects. Model coefficients are determined from Direct Numerical Simulations (DNS) data of homogeneous shear flows subjected to arbitrary mean scalar gradient orientations. This type of tuning process renders the proposed model to be objective towards inhomogeneous applications. Model performance is evaluated in several heated channel flows in both stationary and rotating frames, showing good results. To place the performance of the proposed model into context, we compare with Younis algebraic model, which is known to provide reasonable predictions for several engineering flows.
