基于改进剪切应力输运k-ω湍流模型对考虑风向随高度偏转大气边界层的数值模拟

Numerical Simulation of Atmospheric Boundary Layer Considering Wind Veering Based on Modified Shear-Stress Transport k-ω Turbulence Model

摘要:

基于剪切应力输运（SST）k-ω模型，通过修改模型参数、方程源项和湍动粘度，提出了“改进SST k-ω模型”，并采用该模型对考虑风向随高度偏转的大气边界层进行了计算流体动力学（CFD）数值模拟。通过预前模拟和主模拟两个步骤，对风场自保持的实现方法进行了探讨。研究表明，提出的改进SST k-ω模型可以取得与实测较一致的模拟结果。将预前模拟得到的风剖面作为主模拟的入流边界条件，各物理量均可以在流域中得到较好的保持。

Abstract:

Based on the shear-stress transport （SST） k-ω model， a “modified SST k-ω model” was proposed by modifying the model parameters， the source terms， and the turbulent viscosity. A computational fluid dynamics （CFD） simulation of atmospheric boundary layer （ABL） considering wind veering was performed by using this modified model. The self-sustainable method was discussed in detail including the precursor simulations and the main simulations. The research shows that the simulation results of the modified SST k-ω model are consistent with field measurement values. The physical quantities can be self-sustained well by applying the wind profiles obtained from the precursor simulations as inflow conditions in the main simulations.