Modelling of turbulent dispersion for numerical simulation of wind-driven rain on bridges |
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Authors: | Man Liu Sheng Hong Huang Bo Wen Yan Qiu Sheng Li |
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Institution: | 1.School of Civil Engineering,Hunan University,Changsha,China;2.School of Engineering Science,University of Science and Technology of China,Hefei,China;3.School of Civil Engineering,Chongqing University,Chongqing,China;4.Department of Architecture and Civil Engineering,City University of Hong Kong,Kowloon,Hong Kong |
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Abstract: | Wind-driven rain (WDR) is responsible for many potential negative effects on bridges, such as structural cracking, aggregate erosion, steel corrosion and storm water management problems and so on. Hence, accurate evaluations of the WDR effects on bridges are essential to provide solutions for preventing material degradation and improving durability capability of bridges. However, in most previous WDR numerical studies, the turbulent dispersion of raindrops was neglected. In this paper, the turbulent dispersion is integrated into Eulerian multiphase model to investigate the WDR effects on a bridge with rectangular cross-section. Especially, the influences of the turbulent dispersion are discussed in detail by comparing the WDR simulation results for the cases with and without consideration of the turbulent dispersion in terms of WDR flow fields, volume fraction, specific catch ratio, catch ratio, rain loads and aerostatic force coefficients. The results indicate that the turbulent dispersion for a certain range of raindrop size is needed to be taken into account for obtaining accurate WDR simulation results for bridges. |
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