The aerodynamic performance of a roof depends significantly on its shape and size,among other factors.For instance,large roofs of industrial low-rise buildings may behave differently compared to those of residential h...The aerodynamic performance of a roof depends significantly on its shape and size,among other factors.For instance,large roofs of industrial low-rise buildings may behave differently compared to those of residential homes.The main objective of this study is to experimentally investigate how perimeter solid parapets can alter the flow pattern around a low-rise building with a large aspect ratio of width/height of about 7.6,the case of industrial buildings/shopping centers.Solid parapets of varied sizes are added to the roof and tested in an open-jet simulator in a comparative study to understand their impact on roof pressure coefficients.Roof pressures were measured in the laboratory for cases with and without parapets under different wind direction angles(representative of straight-line winds under open terrain conditions).The results show that using a parapet can alter wind pressures on large roofs.Parapets can modify the flow pattern around buildings and change the mean and peak pressures.The mean pressure pattern shows a reduction in the length of the separation bubble due to the parapet.The parapet of 14%of the building’s roof height is the most efficient at reducing mean and peak pressures compared to other parapet heights.展开更多
基于自研软件MarineFlow开发造波消波功能,在入口边界给定波浪速度,在消波区域添加人工阻尼,在数值波浪水池中耦合VOF(volume of fluid)方法精确模拟Stokes二阶波浪。在速度入口分别输入一阶Stokes波和二阶Stokes波,将计算域中观测点拟...基于自研软件MarineFlow开发造波消波功能,在入口边界给定波浪速度,在消波区域添加人工阻尼,在数值波浪水池中耦合VOF(volume of fluid)方法精确模拟Stokes二阶波浪。在速度入口分别输入一阶Stokes波和二阶Stokes波,将计算域中观测点拟合的浪高曲线与理论曲线进行对比,吻合良好,并得到一阶或二阶Stokes波的输入对数值计算结果影响较小的结论,而且浪高曲线与二阶理论值吻合更好。在数值波浪水池中就波浪对带有防波堤的垂直墙体的砰击采用3套网格进行计算和分析,根据浪高曲线分析该墙体对规则入射波的影响,验证了防波堤对波浪能量的消耗能力和对垂直墙体的防护作用。还开展了KCS标准船模在规则波浪中航行的数值模拟,给出了入射波和船体兴波相互干扰的波形云图。取船体一侧3个观测点的浪高曲线对船模航行兴波与入射波浪的相互作用进行分析,验证了两者存在波峰叠加和抵消等现象,使船体附近波浪运动更为复杂。展开更多
基金support from the Louisiana Board of Regents(RCS and Enhancement)Also,the first author received funds from the NSF I-Corps program at Louisiana State University。
文摘The aerodynamic performance of a roof depends significantly on its shape and size,among other factors.For instance,large roofs of industrial low-rise buildings may behave differently compared to those of residential homes.The main objective of this study is to experimentally investigate how perimeter solid parapets can alter the flow pattern around a low-rise building with a large aspect ratio of width/height of about 7.6,the case of industrial buildings/shopping centers.Solid parapets of varied sizes are added to the roof and tested in an open-jet simulator in a comparative study to understand their impact on roof pressure coefficients.Roof pressures were measured in the laboratory for cases with and without parapets under different wind direction angles(representative of straight-line winds under open terrain conditions).The results show that using a parapet can alter wind pressures on large roofs.Parapets can modify the flow pattern around buildings and change the mean and peak pressures.The mean pressure pattern shows a reduction in the length of the separation bubble due to the parapet.The parapet of 14%of the building’s roof height is the most efficient at reducing mean and peak pressures compared to other parapet heights.
文摘基于自研软件MarineFlow开发造波消波功能,在入口边界给定波浪速度,在消波区域添加人工阻尼,在数值波浪水池中耦合VOF(volume of fluid)方法精确模拟Stokes二阶波浪。在速度入口分别输入一阶Stokes波和二阶Stokes波,将计算域中观测点拟合的浪高曲线与理论曲线进行对比,吻合良好,并得到一阶或二阶Stokes波的输入对数值计算结果影响较小的结论,而且浪高曲线与二阶理论值吻合更好。在数值波浪水池中就波浪对带有防波堤的垂直墙体的砰击采用3套网格进行计算和分析,根据浪高曲线分析该墙体对规则入射波的影响,验证了防波堤对波浪能量的消耗能力和对垂直墙体的防护作用。还开展了KCS标准船模在规则波浪中航行的数值模拟,给出了入射波和船体兴波相互干扰的波形云图。取船体一侧3个观测点的浪高曲线对船模航行兴波与入射波浪的相互作用进行分析,验证了两者存在波峰叠加和抵消等现象,使船体附近波浪运动更为复杂。
