Ventilation flow through a room fitted with a windcatcher using a LES CFD technique

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Transactions on Engineering Technologies - World Congress on Engineering 2014, 2015, pp. 213 - 222 (10)
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In this study, air flow through a three-dimensional room fitted with a two-sided windcatcher is observed numerically, using a commercial computational fluid dynamics (CFD) software package. A LES (Large Eddy Simulation) method is used and the results are compared with those obtained previously by using a RANS (Reynolds Averaged Navier-Stokes) technique. Since LES is generally considered as more accurate but requiring more computational efforts than RANS, the results obtained in this work would verify the RANS results which have covered many more cases in addition to the one considered in this work. The LES and RANS results for the windcatcher configuration considered in this work are in good agreement. Specifically, it is confirmed that the two-canal centred position windcatcher with the bottom length of 10 cm provides full circulation for most part of the room and a large region of stable velocity in the acceptable range of indoor air speed for human comfort.
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