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Evaluation of Approximate Models of Buoyant Turbulent Flows.


pdf icon Evaluation of Approximate Models of Buoyant Turbulent Flows. (475 K)
Dai, Z.; Faeth, G. M.

National Institute of Standards and Technology (NIST) and Society of Fire Protection Engineers (SFPE). International Conference on Fire Research and Engineering (ICFRE). Proceedings. September 10-15, 1995, Orlando, FL, SFPE, Boston, MA, Lund, D. P.; Angell, E. A., Editor(s)(s), 141-146 pp, 1995.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Keywords:

fire research; turbulent flow; buoyant flow; evaluation; turbulence

Abstract:

At the present time, it is necessary to use approximate turbulence models in order to analyze the properties of practical fires due to the computational intractability of fully resolved three-dimensional time-dependent numerical simulations of buoyant turbulent flows representative of fire environments. Developing reliable models to treat buoyancy/turbulence interactions, however, has been inhibited due to the models to treat buoyancy/turbulence interactions, however, has been inhibited due to the absence of measurements needed to evaluate both model approximations and predictions. Thus, the main objective of the present investigation was to compete measurements of the mean and turbulent properties of a classical buoyant turbulent flow that is frequently used to evaluate the predictions of turbulence models; namely, the round buoyant turbulent plume in the fully-developed (self-preserving) region far from the source. The new measurements also are used to initiate evaluation of turbulence modeling ideas, considering both classical similarity concepts, and turbulence models of varying complexity.