科研之友
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摘要
The downburst wind field is simulated by RANS time-averaged simulation method which is based on comparison and verification with existing test data, and facade opening effect on wind pressure distribution inside and outside low-rise building is simulated and analyzed. Focusing on considering that the building is in the radial maximum wind speed position (r/D0=1.0), and effects of changes in wind direction, opening location, number of opening surfaces and opening rate on the distribution of inside and outside wind pressure. The analysis results show that, compared with closed buildings, the combined wind pressure coefficients of the inside and outside roof for single-sided opening buildings increased significantly. When wind direction is 0 degrees, the maximum increase is caused by the opening rate of 7.5%, with an overall average value about 300%. Changing of the number of opening surfaces also has a significant impact on wind pressure inside building. When wind direction is 0 degrees, compared with single-sided opening buildings, wind pressure coefficient of three-sided opening inside buildings decreases most, the maximum value is about 150%. The position changing has a great influence on wind pressure distribution inside and outside building when side opening, compared wind pressure changes between various working conditions in the same zone and the maximum difference of outside pressure coefficient is about 0.4, which occurs on the side near the windward corner area (D1, E1), and the difference of inside pressure coefficient for each zone is about 0.4. Changing of wind direction also has a certain influence on wind pressure distribution inside building, which can cause positive and negative changes of the value. Compared to 0°, when the wind direction is 30°, inside wind pressure changes the most in the area near the leeward corner (D4) on the side of the building with double-sided opening, and inside wind pressure coefficient changes from -0.2 to 0.32.
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