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Management of Natural Ventilation in High-Rise Building-a CFD Study

机译：高层建筑自然通风的管理 - A CFD研究

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The natural ventilation of a 7 floors office building was studied in terms of its openings' discharge coefficient. A 2D, steady state, incompressible CFD model was developed using the FV method. The developed CFD model was validated against experimental data from wind tunnel measurements. Discharge coefficient is calculated for three elevations (ground floor, 4th and 7th floor) considering four combination of inclination angles 15° and 30" for windward and leeward openings. It was examined the dependence of discharge coefficient from: the wind velocity, the characteristics of the field where the building is situated (roughness length and atmospheric boundary layer thickness) considering four field types: a) Urban area (center and suburbs), b) Open field (classes 2 and 3). Two types of discharge coefficient was calculated, one based on the wind velocity at the opening, Cd, and one based on the wind velocity at the infinity, Cdw. The first varies between 0.54 to 0.7 but the second varies between 0.13 to 0.89 and it is considered more usable since it relates the buildings' ventilation to the average wind velocity in the examined area, information available to the designer. Both are depended on the openings' inclination angle, from the elevation of the examined floor, from the field roughness length around the building and from the wind turbulence intensity.
机译：在开口的排放系数方面研究了7层办公楼的自然通风。使用FV方法开发了2D，稳态，不可压缩的CFD模型。开发的CFD模型验证了来自风洞测量的实验数据。考虑倾斜角度15°和30“的四个凸起（底层，第4和第7楼）计算放电系数，用于绕道和背风开口的四个倾斜角度15°和30”。它被检查了从：风速，特征的排放系数的依赖性考虑四个田间类型的建筑物（粗糙度长度和大气边界层厚度）的领域：a）城市区域（中心和郊区），b）开放场（课程2和3）。计算了两种排放系数，一种基于开口，CD的风速，以及基于无穷大的风速，CDW的风速。第一个变化在0.54至0.7之间，但第二个变化在0.13至0.89之间，因此它被认为是更加可用的建筑物对所检查区域的平均风速通风，设计师可用的信息。两者都依赖于开口的倾斜角度，从审查的地板的高度来看，建筑物周围的野外粗糙度长度和风湍流强度。

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