A pdf Description of Turbulent Axisymmetric Free Jet Flow

[+] Author and Article Information
Ming-Hua Chen, Zuu-Chang Hong

Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan, 320, R.O.C.

J. Fluids Eng 121(1), 73-79 (Mar 01, 1999) (7 pages) doi:10.1115/1.2822015 History: Received June 09, 1998; Revised December 04, 1998; Online December 04, 2007


This study presents the applications of a turbulence probability density function (pdf) equation to compute an axisymmetric turbulent free jet flow. In view of the difficulty of solving this pdf equation directly by conventional numerical methods, an approximate moment method is applied. The Calculated triple velocity correlations appearing in the second-order moments equation are calculated and compared with measured values and with those estimated by moment-closure models. The results reveal that the pdf approach gives consistency in the higher-order moments and radial budget of third moments of velocity, and that the neglect of the mean-strain production, the rapid part of the pressure correlation and the dissipation are responsible for deviations between moment-closure models and experiments. Therefore, pdf methods appear to be more suitable than conventional moment-closure models in terms of revealing turbulence structure.

Copyright © 1999 by The American Society of Mechanical Engineers
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