通过设置流动的速度、特征长度及运动粘度，获得湍流的相关参数-By setting the flow speed, the characteristic length and kinematic viscosity, obtaining the relevant parameters of turbulence

通过流动的相关参数，包括速度粘度以及特征尺度，获得最适宜的Y+值所对应的第一层网格尺寸-By flow parameters, including speed and viscosity characteristics of scale, access to the most appropriate Y+ value corresponding to the first layer of mesh size

粘弹性本构模型，用于粘弹性材料计算，Umat程序(constitute model for compute the viscosity material)