基于改进NSRFG方法的三维山丘绕流风场大涡模拟

LARGE EDDY SIMULATION OF THE WIND FIELD AROUND A THREE-DIMENSIONAL HILL BASED ON AN IMPROVED NSRFG METHOD

摘要: 准确地合成满足湍流边界层风场特征的大涡模拟入流脉动是研究山区地形绕流风场的关键问题。在NSRFG（Narrowband Synthesis Random Flow Generation）方法的基础上，通过对空间调谐因子γj进行空间相关性修正，同时引入时间尺度因子τ0和谱能量修正系数λj，提出了一种改进的大涡模拟入流脉动合成方法——INSRFG（Improved NSRFG），并采用该方法进行了三维山丘绕流风场大涡模拟研究，并与风洞试验结果及B类风场规范进行对比分析，验证改进方法的有效性。入流面风场验证表明，

Abstract: The synthesis of the inflow turbulence with the characteristics of prescribed turbulent boundary layer wind fields for large eddy simulation (LES) is the key issue for accurately simulating the wind flow filed around hilly terrain. Based on the NSRFG (Narrowband Synthesis Random Flow Generation) method, an improved NSRFG (INSRFG) method was put forward by improving the spatial tuning factor γj,, introducing the time scale factor τ0 and the spectral energy correction coefficient λi. The