There are controversial requirements involved in developing numerical methodologies in order to compute the flow in industrial\r\nfans.The full resolution of turbulence spectrum in such high-Reynolds number flow configurations entails unreasonably expensive\r\ncomputational costs. The authors applied the study to a large unidirectional axial flow fan unit for tunnel ventilation to operate in\r\nthe forward direction under ambient conditions. This delivered cooling air to the tunnel under routine operation, or hot gases\r\nat 400�°C under emergency conditions in the event of a tunnel fire. The simulations were carried out using the open source\r\ncode OpenFOAM, within which they implemented a very large eddy simulation (VLES) based on one-equation SGS model to\r\nsolve a transport equation for the modelled (subgrid) turbulent kinetic energy. This subgrid turbulence model improvement is a\r\nremedial strategy in VLES of high-Reynolds number industrial flows which are able to tackle the turbulence spectrumâ��s well-known\r\ninsufficient resolution.TheVLES of the industrial fan permits detecting the unsteady topology of the rotor flow. This paper explores\r\nthe evolution of secondary flow phenomena and speculates on its influence on the actual load capability when operating at peakpressure\r\ncondition. Predicted noise emissions, in terms of sound pressure level spectra, are also compared with experimental results\r\nand found to agree within the uncertainty of the measurements.
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