Numerical Simulation Of Wind Load Effect On Low-rise Buildings In The Typical Mountain Terrain

Wind hazard is the most devastative and disastrous one in the natural disasters.Mountain area takes a great proportion in the offshore area of our country. Because ofthe relatively large population density and limited land resources, a lot of low-risebuildings are constructed in the complex mountain area. However, when the air flowsthrough the mountainous and hilly regions, the wind speed, wind direction, windpressure and turbulent situation of the near ground wind field will be significantlyaffected by the complex terrain and landforms, which lead to the wind field of theseareas shows obvious difference from flat area. When the typhoon comes, theprobability of the wind-induced damage of buildings will significantly increase by thenegative effect of wind caused by the special topography, and may cause more seriouscasualties and destruction of the building. More studies on wind resistance of low-risebuildings have scientific and social significance to improving the wind resistancecapacity of low-rise buildings in offshore area of our country.The thesis briefly described the principal theories and calculation methods of thecomputational wind engineering at first, and then ma de an exposition of the basictheory of CFD numerical simulation and technology. A CFD model of a mountainlandscape in the typical operating conditions was established in the fluid dynamicssoftware FLUENT with the numerical simulation technology, and a comprehensiveand accurate simulation of wind field was analyzed, as well as the wind load patternsand characteristics of low-rise buildings with cornice in typical mountain landscapes.Numerical simulation had advantages over the wind tunnel test in getting flow fielddistribution, and it explained the wind pressure distribution of low-rise buildings in ahigher level. To verifying the reliability of the numerical simulation, the simulatingresults were compared with wind tunnel test, and the reasons leading to thedifferences were described. Furthermore the simulation technology was improved. Areference to the computational domain setting was put forward about this kind of windtunnels numerical simulation through the CFD. Meanwhile, the paper can provide areference for wind resistant design of low-rise buildings and give guidance to theactual project.