闽南红砖大厝庭院形态对屋面风压与风场的影响研究

基于ANSYS Fluent软件选用RNG k-ε湍流模型,以闽南红砖大厝民居为对象,通过数值计算、分组对比分析庭院与厝埕的进深对风场及屋面风压分布的影响并探讨利于抗风的建筑形式。研究表明:①随院落宽度的增加屋面最大平均风压系数绝对值呈现显著地降低又升高,最大降低21.2%;庭院宽度与进深的比例为1.5时屋面最大平均风压系数和整体平均风压系数绝对值最小,利于防风。②随院落进深的增加,屋面最大平均风压系数绝对值呈现显著地降低又升高,最大降低26.0%,庭院宽度与进深的比例为0.67时屋面最大平均风压系数和整体平均风压系数绝对值最小,利于防风。③有厝埕的屋面最大平均风压系数绝对值、整体平均风压系数绝对值与无厝埕相比均显著下降,最大平均风压系数绝对值降低了48.7%;随着厝埕进深的减小,除少量测点外,平均风压系数绝对值降低,降低最大幅度为26%。

Impact of Courtyard Morphology on Wind Pressure and Wind Field of Red Brick Dwelling in Minnan

The RNG k-εturbulence model is selected in ANSYS Fluent software in the research,the Red Brick Dwelling in Minnan are chosen as research object.Analysis of the influence of courtyard and courtyard before dwelling on the wind field and roof wind pressure distribution were discussed,and the form of dwelling of wind resistance was discussed based on numerical calculation.Research showed that:①The absolute value of the maximum average wind pressure coefficient of the roof decreased significantly and rose with the increase of the courtyard width,with a maximum decrease of 21.2%.When the ratio of the courtyard width to the depth was 1.5,the maximum average wind pressure coefficient and the absolute value of the overall average wind pressure coefficient were the smallest,which was good for wind protection.②As the depth of the courtyard increased,the absolute value of the maximum average wind pressure coefficient of the roof decreased significantly,with a maximum decrease of 26.0%.When the ratio of the courtyard width to the depth was 0.67,the maximum average wind pressure coefficient and the absolute value of the overall average wind pressure coefficient of the roof were the smallest,which was good for wind protection.③The absolute value of the maximum average wind pressure coefficient and the absolute value of the overall average wind pressure coefficient of the roofs with courtyard before dwelling were significantly reduced compared with those without courtyard before dwelling,and the absolute value of the maximum average wind pressure coefficient was reduced by 48.7%.As the depth of courtyard before dwelling decreased,except for a small number of measuring points,the absolute value of the average wind pressure coefficient decreased,with a maximum decrease of 26%.