Simulation of buoyancy driven and winddriven ventilation flow in a three dimensional room fitted with a windcatcher

Publication Type:
Conference Proceeding
Citation:
Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018, 2018
Issue Date:
2018-01-01
Full metadata record
© 2018 Australasian Fluid Mechanics Society. All rights reserved. Natural ventilation is the process of supplying and removing air through an indoor space by natural means. There are two types of natural ventilation occurring in buildings: winddriven ventilation and buoyancy driven or stack ventilation. Combining the wind driven and the buoyancy driven ventilation will be investigated in this study through the use of a windcatcher natural ventilation system. As stack driven air rises leaving the windcatcher, it is replaced with fresh air from outside entering through the positively pressured windward side. To achieve this, CFD (computational fluid dynamics) tool is used to simulate the air flow in a three dimensional room fitted with a windcatcher based on the winddriven ventilation alone, and combined buoyancy and winddriven ventilation. A three dimensional real sized room with a length of 5 m, a width of 4 m and a height of 3 m fitted with a windcatcher is modeled in this study using Ansys Fluent. The combined, buoyancy driven and winddriven ventilation, has provided approximately 3.16% increase in the total air flow rate, when heat flux of 500 W/m2 is applied at the front and bottom walls of the windcatcher’s outlet compared to the winddriven ventilation only. The pattern of air flow through the room has provided full ventilation at 1.2 m height where most of the human occupancy occurs.
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