Abstract
Numerical analyses based on CFD steady RANS were conducted to investigate the effects of roof configuration on wind-induced natural ventilation for an isolated roofed building. Gable roof and saltbox roof building models were tested with 15˚, 25˚, 35˚ and 45˚ roof pitch in present study. The flow field information and flow characteristics were obtained from the contours and plots generated by CFD. In accordance to the increment of roof pitch, the turbulence kinetic energy and mean velocity ratio show vigorous response. The flow separated at the windward corner do not reattach onto the roof, thus induced higher velocity gradient and form a large vortex at the roof ridge. The vortices behind then building caused by the flow separation at the roof ridge extend along the mixing layer and spread up to the roof. The pressure differences mainly rely on the roof shapes. Greater pressure differences between the upstream, interior and downstream was observed in saltbox roof cases. This is due to the extended roof height which boosted the impinging effect caused by the incoming wind. Generally, the saltbox roof configuration exhibit better performance than gable roof in terms of the measured parameters.
Highlights
Natural ventilation has emerged from the high demand of built environment with satisfying energy-efficiency and sustainability
This paper aims to fill this aforementioned gap with a series of 3D steady RANS computational fluid dynamics (CFD) simulations
Numerical investigations based on steady RANS were conducted on isolated building with two different roof configurations, namely gable roof and saltbox roof with various roof angle
Summary
ABSTRACT – Numerical analyses based on CFD steady RANS were conducted to investigate the effects of roof configuration on wind-induced natural ventilation for an isolated roofed building. The vortices behind building caused by the flow separation at the roof ridge extend along the mixing layer and spread up to the roof. Greater pressure differences between the upstream, interior and downstream was observed in saltbox roof cases. This is due to the extended roof height which boosted the impinging effect caused by the incoming wind. The saltbox roof configuration exhibit better performance than gable roof in terms of the measured parameters. KEYWORDS Natural ventilation; roof configuration; computational fluid dynamics (CFD); steady RANS; ventilation rate
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