tailieunhanh - Computational Fluid Dynamics 2011 Part 7

Tham khảo tài liệu 'computational fluid dynamics 2011 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 174 Computational Fluid Dynamics enhanced through the incorporation of appropriate green features in sustainable development such that there is a potential saving in non-renewable energy consumption in buildings. A commercial CFD package FLUENT has been applied to various research works and found to be useful Bojic et al. 2001 Mak et al. 2005b Mak Oldham 1998a Mak Oldham 1998b Mak Yik Francis 2002 Niu et al. 2005 . FLUENT has been adopted by the author and his research partners Li Mak 2007 Li et al. 2006 Mak et al. 2007 to study the performance of two designed green features including windcathcer and wing walls used for sustainable buildings. This chapter will introduce the numerical simulation of these two green features. The CFD numerical technique used including geometry numerical grids boundary conditions and turbulence models will be discussed. The ventilation performance of these green features in buildings will be discussed. Other CFD applications in building services engineering such as prediction of flow-generated noise using CFD will also be briefly introduced. 2. Study of green features for sustainable buildings using CFD Windcatcher Description of the windcatcher The windcatcher system is one of the green features for providing good natural ventilation. In the modern design of windcatchers the principles of wind effect and passive stack effect are considered in the design of the stack that is divided into two halves or four quadrants segments with the division running the full length of the stack Awbi Elmualim 2002 . The windcatcher systems were employed in buildings in the Middle East for more than three thousands years. They have different names in different parts of region Bahadori 1994 Elmualim et al. 2001 McCarthy 1999 . Although more and more windcatcher systems have been applied into recent commercial buildings and residential buildings such as the Queen s Buildings at Demonfort University and the BRE office of the future Hurdle 2001 .