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Contributor(s) |
TABLADA, Abel, Historian Office of Havana, Cuba. Faculty of Architecture, Leuven, Belgium; BLOCKEN, Bert, Laboratory of Building Physics, Department of Civil Engineering, Katholieke Universiteit Leuven, Leuven, Belgium; CARMELIET, Jan, Laboratory of Building Physics, Department of Civil Engineering, Katholieke Universiteit Leuven, Leuven, Belgium; DE TROYER, Frank, PGC Human Settlements, Department of Architecture, Urban Design and Planning, Katholieke Universiteit Leuven, Leuven, Belgium; VERSCHURE, Han, PGC Human Settlements, Department of Architecture, Urban Design and Planning, Katholieke Universiteit Leuven, Leuven, Belgium |
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Abstract |
Courtyard and building`s geometry are crucial aspects to achieve efficient natural ventilation and healthy indoor conditions in a compact urban environment. The paper aims to validate 2-D computational fluid dynamics (CFD) simulations by comparing air
flow conditions inside 5 different cavity ratios (width/height) with 2-D published wind tunnel experiments. The Standard model, with Non Equilibrium wall functions and first-order-accuracy schemes agrees well with the tunnel experiments concerning
horizontal air speed (U) and air flow for a cavity ratio W/H=1.0. For the other cavity ratios (W/H=0.7, 0.5, 0.3, 2.0) the secondary recirculation area found in the tunnel experiment is not captured by the CFD simulations. The influence of the courtyard
ratios and the presence of obstructions on the potential for natural ventilation are also analyzed. Cavity ratios 1.0 and 0.7 have the highest potential for natural ventilation due to their geometry that promotes the development of a strong vortex and
high velocity magnitudes. The presence of obstructions on the courtyard`s top corners provokes a weaker flow inside the cavity and therefore lower velocities and lower potential for natural ventilation.
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