2013-2.pdf - Jin M Zuo W and Chen Q 2013 “Simulating...

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1 Simulating Natural Ventilation in and Around Buildings by Fast Fluid Dynamics Mingang Jin 1 , Wangda Zuo 2 , Qingyan Chen 1 1 School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA 2 Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, FL 33124, USA Qingyan Chen (Corresponding Author) Email: [email protected] Phone: +1-765-496-7562 Fax: +1-765-494-0539 ABSTRACT Natural ventilation is a sustainable technology that can provide a well-built environment and also save energy. The application of natural ventilation to buildings requires a careful approach in the early design phase, and fast, simple design tools are greatly needed. Fast fluid dynamics (FFD) can provide useful airflow information at a speed much faster than CFD so that it is a potential design tool for natural ventilation. This study thus validated FFD with test cases representing different types of natural ventilation. The results showed that FFD was capable of predicting the main air flow feature and ventilation rate with reasonable accuracy for wind-driven or buoyancy-driven natural ventilation. FFD simulation can reflect the influence of wind direction and surrounding buildings on natural ventilation. Keywords: Natural ventilation; Fast fluid dynamics; Computational fluid dynamics NOMENCLATURE F i body force i, j index of coordinate P pressure S source term t time U i , U j velocity components in x i and x j directions, respectively U n , U n+1 velocity at previous and current time step, respectively U * , U ** intermediate velocity x i , x j spatial coordinates in i and j direction, respectively Δt time step size Jin, M., Zuo, W., and Chen, Q. 2013. “Simulating natural ventilation in and around buildings by fast fluid dynamics,” Numerical Heat Transfer, Part A: Applications, 64(4), 273-289.
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2 Γ transport coefficient ρ density υ kinetic viscosity Φ scalar in transport equation 1. Introduction Natural ventilation is a sustainable building technology that can provide a good indoor environment and save energy [1]. It is preferred over mechanical ventilation for sustainable building design. However, the design of natural ventilation is more difficult than that for mechanical ventilation because the driving force of natural ventilation is complicated [2] and its performance is highly dependent on various factors, such as outdoor microclimate, building shape and orientation, window location and orientation, and internal heat sources [3]. These factors should be thoroughly considered at the early stage of building design in order to achieve good natural ventilation. A design tool that can predict the influence of these factors on natural ventilation will be necessary for architects to optimize the natural ventilation design.
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  • Fall '19
  • Computational fluid dynamics

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