Abstract
ABSTRACTGood air quality is one of the main requirements of human health. Jet fan ventilators are often applied for pollutant removal in large enclosures, where lack of fresh air is significant. During the design phase, computational fluid dynamic (CFD) techniques are most often used to verify the effectiveness of ventilation. However, reliable designs based on CFD, require accurate jet fan airstream modelling. The paper intends to present the best turbulence model (as available in FDS) for modelling of a jet fan in FDS. For that measurements of longitudinal velocity distribution of air supplied from the jet fan are performed and presented. Results from CFD simulations for the same geometry in which measurements are performed are compared with that. The outcome proposes use of specific turbulence models as available in FDS for this configuration. It is proven that the default Deardorff model for the FDS 6 is not the most accurate for jet fan stream simulations. Moreover, the results show that sloped jet fan airstreams are modelled correctly only with fine meshes, and this can have a significant impact on increasing computational costs.
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