【摘要】 我国潜在和现役的大型风电场主要坐落于山地、丘陵等复杂地形区域，在复杂地形风资源数值模拟中，地表粗糙度是影响风况的主要因素之一。现有的关于复杂地形粗糙度影响规律的研究较少，文章基于OpenFOAM平台，采用雷诺平均湍流模型（RANS），通过数值模拟分析典型山丘和峰丛地形的绕流效应，利用风电场实测数据验证模型的可靠性，研究不同特征峰丛地形、粗糙度下流场分布的规律。研究结果显示，随着粗糙度的增加，山顶风加速效应减弱，背风侧回流区范围变大；渐低峰丛地形与等高峰丛地形受粗糙度影响的规律一致，在小粗糙度（0.25和0.5）下基本不受影响，渐高峰丛在粗糙度达到0.5时，风速发生剧烈变化。更多还原

【Abstract】 Currently, potential and active large-scale wind farms in our country are often located in complex terrain areas such as mountains and hills. In the numerical simulation of wind resource in complex terrains, surface roughness is one of the main factors affecting wind conditions.Existing research on the influence of roughness in complex terrains is relatively limited. This paper is based on the OpenFOAM platform and uses the Reynolds-Averaged Navier-Stokes(RANS)to analyze the flow effects around typical hills and peak clusters. The reliability of the model is verified using field measurement data from wind farms,and the distribution patterns of the flow field under different characteristic peak cluster terrains and roughness levels are studied. The results show that with the increase of roughness, the wind acceleration effect on the summit weakens, and the size of the leeward backflow area increases. The law of roughness impact on gradually descending peak clusters is consistent with that of flat-topped peak clusters. They are minimally affected under low roughness(0.25 and 0.5), while for gradually rising peak clusters,wind speed changes dramatically when the roughness reaches 0.5.更多还原