Turbulence model performance for ventilation components pressure losses

Abstract This study looks to find a suitable turbulence model for calculating pressure losses of ventilation components. In building ventilation, the most relevant Reynolds number range is between 3×10 4 and 6×10 5 , depending on duct dimensions airflow rates. Pressure loss coefficients can increase considerably some components at numbers below 2×10 . An initial survey popular models was conducted selected test case bend with such strong dependence. Most failed in reproducing this dependence predicted curve progressions that were too flat only applicable higher numbers. Viscous effects near walls played an important role present simulations. modelling, near-wall damping functions are used account influence. A implements modelling lag elliptic blending k-? model. gave reasonable predictions lower Another example low Wilcox (LRN). The modification uses initially developed simulating profiles as aircraft wings. It has not been widely internal flows air flows. Based reference cases, three closure LRN adapted work simulate Improved obtained new (LRNM model). underlined ductworks give first insights application. Both modified LRNM relatively well where other tested failed.