Abstract

ings of BS2013: 13th Conference of International Building Performance Simulation Association, Chambéry, France, August 26-28 SIMULATING MULTIPLE STEADY STATES IN NATURALLY VENTILATED ENCLOSURES USING LARGE EDDY SIMULATION Faisal Durrani¹, Malcolm J. Cook¹, James J McGuirk² and Torwong Chenvidyakarn³ ¹School of Civil and Building Engineering, Loughborough University, LE11 3TU, UK ²Department of Aeronautical and Automotive Engineering, Loughborough, LE11 3TU, UK ³School of Management Technology, Shinawatra International University, Bangkok, Thailand ABSTARCT This paper reports research carried out with the aim of evaluating the performance of Large Eddy Simulation (LES) and unsteady Reynolds-averaged Navier-Stokes (URANS) model for predicting multiple steady states in a naturally ventilated enclosure. Chenvidyakarn and Woods (2005) developed analytical models and conducted heat in water experiments to simulate air flow patterns through a large space with large heat gains. They showed that when the space contains two high-level stacks of different heights and a low-level opening, and is heated by a uniform source at the base, three different flow regimes are possible within a single set of boundary conditions. The geometry of the space and flow history determines which flow regime actually occurs. The focus of this work is to investigate how URANS and LES perform in predicting the three steady states.

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