Large-eddy simulation of starting buoyant jets
Author(s)
Law, Adrian Wing-Keung; Adams, E. Eric; Fringer, Oliver B.; Wang, Ruoqian
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A series of Large Eddy Simulations (LES) are performed to investigate the penetration of starting buoyant jets. The LES code is first validated by comparing simulation results with existing experimental data for both steady and starting pure jets and lazy plumes. The centerline decay and the growth rate of the velocity and concentration fields for steady jets and plumes, as well as the simulated transient penetration rate of a starting pure jet and a starting lazy plume, are found to compare well with the experiments. After validation, the LES code is used to study the penetration of starting buoyant jets with three different Reynolds numbers from 2000 to 3000, and with a wide range of buoyancy fluxes from pure jets to lazy plumes. The penetration rate is found to increase with an increasing buoyancy flux. It is also observed that, in the initial Period of Flow Development, the two penetrative mechanisms driven by the initial buoyancy and momentum fluxes are uncoupled; therefore the total penetration rate can be resolved as the linear addition of these two effects. A fitting equation is proposed to predict the penetration rate by combining the two independent mechanisms.
Date issued
2010-12Department
Massachusetts Institute of Technology. Department of Civil and Environmental EngineeringJournal
Environmental Fluid Mechanics
Publisher
Springer-Verlag
Citation
Wang, Ruo-Qian, Adrian Wing-Keung Law, E. Eric Adams, and Oliver B. Fringer. “Large-Eddy Simulation of Starting Buoyant Jets.” Environ Fluid Mech 11, no. 6 (December 2011): 591–609.
Version: Author's final manuscript
ISSN
1567-7419
1573-1510