Experimental and Numerical Study of Air Flows in a Full Scale Room
Jiang, Jianbo
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https://hdl.handle.net/2142/86072
Description
Title
Experimental and Numerical Study of Air Flows in a Full Scale Room
Author(s)
Jiang, Jianbo
Issue Date
2007
Doctoral Committee Chair(s)
Wang, Xinlei
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Different turbulence models based on the Reynolds-Averaged Navier-Stokes (RANS) method and the Large Eddy Simulation (LES) with dynamical subgrid model were evaluated with the experimental data from the VPSTV measurements. The LES provided the best predictions for the three ventilation rates while RSM predictions were closest to measurements among the RANS models. The results from LES at seven different ventilation rates ranging from 0.1 ACH to 27.9 ACH showed that airflows inside the room were fully developed when the ventilation rates were equal or higher than 19.5 ACH. This was demonstrated by use of the maximum velocities decaying along the ceiling and the floor, flow topologies (including flow patterns, separation and reattachment points, positions of vortices, etc.), vorticity and turbulent kinetic energy spatial distributions. In addition, the maximum velocity decay and the airflow boundary layer growth along both the ceiling and floor behaved like those of plane turbulent wall jets as proposed by other studies.
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