标题： 任意几何结构的混掺长度模型：平行流动的情况 显示英文标题

标题： A mixing length model for arbitrary geometry: the case of parallel flows

摘要： 我们提出一个用于湍流模型的混合长度的经验模型。 它具有自然考虑物体几何形状的优点，同时满足纳维-斯托克斯方程的标准对称性。 我们使用该模型研究通道流动和管道流动。 我们将三个模型参数校准以恢复粘性亚层中的阻尼、壁面的对数律以及外区行为。 我们的模型在高雷诺数下的管道流动中与摩擦系数测量结果相比具有优势，并给出了几种典型流动的混合长度的解析预测。 显示英文摘要

摘要： We present a phenomenological model for the mixing length used in turbulence models. It has the advantage of naturally accounting for the object's geometry while satisfying the standard symmetries of the Navier-Stokes equations. We employ the model to study channel flow and pipe flow. We calibrate the three model parameters to recover the damping in the viscous sub-layer, the log-law of the wall, and the outer region behaviors. Our model compares favorably to friction factor measurements in the pipe flow at high Reynolds numbers and gives analytical predictions of the mixing length for several canonical flows.