Abstract Large eddy simulations (LES) are performed to examine the flow characteristics around solar arrays mounted on a flat-roof building for two oblique wind directions, 45° and 135°. The main purpose of this study is to clarify the mechanisms of some special features of wind pressure characteristics acting on solar panels obtained by wind tunnel experiments. Numerical simulation is first conducted for a flat-roof building without solar arrays to validate the accuracy of LES for oblique wind directions. Numerical simulations are then made for a flat-roof building with solar arrays. For 45° wind direction, local separations and reattachments of the downflows of the left-side conical vortex are found to play important roles in large negative pressures near the higher edges of the upper surfaces and positive pressures on some parts of the lower surfaces of solar panels. For 135° wind direction, local vortices generated from the higher edges of the solar panels form local wake regions downwind of the panels and cause downward net pressures on most of the panels. The effects of the gaps on pressures on the upper surfaces of solar arrays are not significant, but those on the lower surfaces are significant because of the flows passing under the panels.

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锥形涡流特征及其对LES平屋顶太阳能电池阵风压的影响

摘要 进行大涡模拟 (LES) 以检查安装在平屋顶建筑物上的太阳能电池阵列周围的流动特性，用于两个倾斜的风向，45° 和 135°。本研究的主要目的是阐明通过风洞实验获得的风压特性的某些特性作用于太阳能电池板的机理。首先对没有太阳能电池板的平屋顶建筑进行数值模拟，以验证 LES 对斜风向的准确性。然后对带有太阳能电池板的平屋顶建筑进行数值模拟。对于 45° 风向，发现左侧锥形涡旋下流的局部分离和重新附着在太阳能电池板上表面较高边缘附近的大负压和下表面某些部分的正压中起重要作用。对于 135° 风向，从太阳能电池板的较高边缘产生的局部涡流形成了电池板下风向的局部尾流区域，并对大多数电池板造成向下的净压力。间隙对太阳能电池阵列上表面压力的影响并不显着，但由于流经面板下方的流动，下表面的压力影响显着。太阳能电池板较高边缘产生的局部涡流形成了电池板下风向的局部尾流区域，并对大多数电池板造成向下的净压力。间隙对太阳能电池阵列上表面压力的影响并不显着，但由于流经面板下方的流动，下表面的压力影响显着。太阳能电池板较高边缘产生的局部涡流形成了电池板下风向的局部尾流区域，并对大多数电池板造成向下的净压力。间隙对太阳能电池阵列上表面压力的影响并不显着，但由于流经面板下方的流动，下表面的压力影响显着。