Although the study of flow around buildings has a rich background, the development of construction material, the congestion of buildings, the urban ventilation and consideration of pedestrian wind condition make the necessity of further insightful flow-physic studies. This study numerically investigates the gap and wake flows associated with two inline non-identical-height (aspect ratios of 4 and 7 for the up- and downstream) buildings at a Reynolds number of 2.2 × 10⁴ and gap spacing (G*) of 1, 3, and 5 through the large eddy simulation technique. It is found that an increase of G* mostly affects the flow pattern in the gap, so that the slender-body, alternate reattachment and semi-stable gap flow at the G* of 1 (or 3) turns into the co-shedding flow at the G* of 5. The pressure coefficients (${\overline{C}}_p$) on the cylinders' faces show that an increase of G* from 1 to 3 increases/decreases the ${\overline{C}}_p$ on the side (and top) faces of upstream/downstream cylinders, respectively. Further increasing G* from 3 to 5, however, drops the ${\overline{C}}_p$ on the side and top faces of both cylinders. On the other hand, the flow regime produces a profound effect on the pedestrian level so that the strong wind condition appears in the small gap, and a very weak wind condition in the vortex cores. Hence a minimum gap of 3 is recommended for better pedestrian level wind conditions. Besides, increasing gap from 1 to 5 reduces the shielding effect of the interfering building markedly.

尽管建筑物周围流动的研究有着丰富的背景，但建筑材料的发展、建筑物的拥堵、城市通风以及对行人风况的考虑，使得进一步深入的流动物理学研究成为必要。本研究以数值方式研究了雷诺数为 2.2 × 10 ⁴且间隙间距 ( G * ) 为2.2 × 10 ^{4 的}两座内嵌非相同高度（上下游的纵横比为 4 和 7）建筑物的间隙和尾流流。 1、3 和 5 通过大涡模拟技术。据发现，增加ģ *主要影响在间隙中的流动模式，从而使细长体，在备用复位和半稳定间隙流ģ *1（或 3）在G *为 5 时变成共同脱落流。压力系数（${\overline{C}}_{磷}$) 在圆柱面上表明G *从 1 增加到 3 会增加/减少${\overline{C}}_{磷}$分别位于上游/下游气缸的侧面（和顶面）上。然而，进一步将G*从 3 增加到 5 会降低${\overline{C}}_{磷}$在两个气缸的侧面和顶面。另一方面，流态对行人水平产生了深远的影响，使得在小间隙中出现强风条件，而在涡核中出现非常弱的风条件。因此，为了更好的行人水平风条件，建议最小间隙为 3。此外，将间隙从1增加到5会显着降低干扰建筑物的屏蔽效果。