Application of the k-ε Turbulence Model to Buoyant Adiabatic Wall Plumes

Author:

Delichatsios Michael A.1,Brescianini C. P.2,Paterson D.2,Wang H. Y.3,Most J. M.3

Affiliation:

1. FireSERT, University of Ulster, Shore Road, Bt37 0QB, Northern Ireland

2. Fire Science and Technology Laboratory, Construction and Engineering, CSIRO Building, P.O. Box 310, North Ryde, NSW 1670, Sydney, Australia

3. Laboratoire de Combustion et de Détonique, UPR 9028 au CNRS, ENSMA, Téléport 2, BP 40109, F-86961 Futuroscope Chasseneuil Cedex, France

Abstract

Computational fluid dynamics based on Reynolds averaged Navier–Stokes equations is used to model a turbulent planar buoyant adiabatic wall plume. The plume is generated by directing a helium/air source upwards at the base of the wall. Far from the source, the resulting plume becomes self-similar to a good approximation. Several turbulence models based predominantly on the k-ε modeling technique, including algebraic stress modeling, are examined and evaluated against experimental data for the mean mixture fraction, the mixture fraction fluctuations, the mean velocity, and the Reynolds shear stress. Several versions of the k-ε model are identified that can predict important flow quantities with reasonable accuracy. Some new results are presented for the variation in a mixing function for the mixture normal to the wall. Finally, the predicted (velocity) lateral spread is as expected smaller for wall flows in comparison to the free flows, but quite importantly, it depends on the wall boundary conditions in agreement with experiments, i.e., it is larger for adiabatic than for hot wall plumes.

Publisher

ASME International

Subject

Mechanical Engineering

Reference20 articles.

1. New Evaluation of the k-ε Turbulence Model for Free Buoyant Plumes;Brescianini;Numer. Heat Transfer, Part A

2. Sangras, R., Dai, Z. and Faeth, G. M., 1998, “Mixing Structure of Plane Self-Preserving Buoyant Turbulent Plumes,” Appendix to the NIST Report No. NIST GCR 99-769, pp. 66–102.

3. Sangras, R., Dai, Z., and Faeth, G. M., 1999, “Buoyant Turbulent Jets and Flames: I. Adiabatic Wall Plumes,” Report sponsored by Laboratory for Building and Fire Research, NIST, Washington, DC, http://fire.nist.gov/bfrlpubs/fire99/PDF/f99154.pdf

4. Heat Transfer and Mean Structure of a Turbulent Thermal Plume Along Vertical Isothermal Walls;Liburdy;ASME J. Heat Transfer

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