Using the finite-difference time-domain (FDTD) method for solving Maxwell’s equations, we have calculated the vertical electric field Ez due to lightning return strokes both in the presence and in the absence of building at the field point. Strikes to both flat ground and tall objects of height h=100, 200, or 500 m are considered. The magnitude of Ez is significantly influenced by the presence of either building at the field point or strike object. In the case of a lightning strike to flat ground, the magnitude of Ez on the roof of building having a plan area of Sb=40 × 40 m2 and a height of hb=20, 50, or 100 m located at a horizontal distance ranging from d =100 to 500 m from the lightning channel is about 1.5, 2, or 3 times, respectively, greater than that at the same horizontal distance on the ground surface in the absence of building. The enhancement factor for Ez due to the presence of building at the field point is essentially not influenced by the presence of strike object (up to 500 m in height).
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机译：使用时域有限差分（FDTD）方法求解麦克斯韦方程组，我们计算了在建筑物存在和不存在时由于雷电回击而产生的垂直电场E z 。场点。考虑对平坦地面和高度为h = 100、200或500 m的高空物体的撞击。 E z 的大小受场点或打击对象建筑物的存在影响很大。在雷击到平坦地面的情况下，建筑物屋顶上的E z 的大小具有S b = 40×40 m2的平面面积位于距雷电通道d = 100至500 m的水平距离处的h b = 20、50或100 m分别大约是其的1.5倍，2倍或3倍在没有建筑物的情况下在地面上保持相同的水平距离。由于场点处建筑物的存在，E z 的增强因子基本上不受打击对象（高度不超过500 m）的影响。
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