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Building and environment v.114, 2017년, pp.495 - 506   SCIE
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Ten questions concerning modeling of wind-driven rain in the built environment

Derome, Dominique (Laboratory of Multiscale Studies in Building Physics, Empa, 8600 Dübendorf, Switzerland ); Kubilay, Aytaç (Laboratory of Multiscale Studies in Building Physics, Empa, 8600 Dübendorf, Switzerland ); Defraeye, Thijs (Laboratory of Multiscale Studies in Building Physics, Empa, 8600 Dübendorf, Switzerland ); Blocken, Bert (Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 Eindhoven, The Netherlands ); Carmeliet, Jan (Laboratory of Multiscale Studies in Building Physics, Empa, 8600 Dübendorf, Switzerland );
  • 초록  

    Abstract Wind-driven rain (WDR) in the built environment is a complex multiscale phenomenon. Wind flows in complex urban environment and rain events of various intensities may lead to very different rain deposition distributions within the city. Proper modeling of WDR is required as moisture is a main cause of material degradation in the built environment but also as understanding the water cycle in the urban environment is essential to provide solutions for the urban heat island, amongst others. What are the main aspects to be taken into account to predict wind-driven rain? How should such aspects be considered and modeled? Is it possible and relevant to predict in detail the moisture loads due to rain in complex systems as cities? This paper answers these questions from a multiscale perspective combining modeling and experimental work. The different scales relevant for accurate estimation of wind-driven rain in the built environment are presented. Rain deposition on complex geometries can be modeled by CFD, taking into account turbulent dispersion. Such modeling provides the impact velocity and angle of attack for each droplet size at any location on the urban surfaces. Using this information and the structure of the surface, the fate of the rain droplets can be predicted, namely whether it splashes, bounces or simply spreads. Highlights Wind-driven rain (WDR) in the built environment is a complex multiscale phenomenon. The main aspects to be taken into account to predict wind-driven rain and how should such aspects be considered and modeled. The different scales relevant for accurate estimation of wind-driven rain in the built environment are presented.


  • 주제어

    Wind-driven rain .   Built environment .   Droplet trajectory .   Computational fluid dynamics (CFD) .   WDR catch ratio .   Droplet fate .   Porous materials.  

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