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符合近地脉动风场特性的LES脉动入口条件是准确模拟结构表面时变风压的必要条件。该文基于LES模型对平板湍流边界层进行模拟,采用周期边界条件实现脉动输入,并将顺压力梯度引入流体控制方程以维持湍流边界层的稳定。数值结果表明,采用周期边界条件可成功实现脉动输入,边界层在顺压力梯度下的自保持性良好,可满足工程需求。顺流向平均流速剖面以及湍流强度剖面均满足低湍流下的风场特性,数值结果可为我国B类地貌下抗风研究采用。
The LES pulsation inlet conditions conforming to the characteristics of near-ground pulsating wind field are the necessary conditions for accurately simulating the time-varying air pressure on the structure surface. This paper simulates the turbulent boundary layer based on the LES model, applies the periodic boundary conditions to realize the pulsation input, and introduces the pressure gradient into the fluid control equation to maintain the stability of the turbulent boundary layer. The numerical results show that the pulsation input can be successfully achieved with the periodic boundary conditions, and the self-holding of the boundary layer under the pressure gradient is good, which can meet the engineering requirements. The average flow velocity profile and turbulence intensity profile both meet the wind field characteristics under low turbulence, and the numerical results can be used for the study of wind resistance under the Category B geomorphology in China.