A pdf description of turbulent axisymmetric free jet flow

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题名:	A pdf description of turbulent axisymmetric free jet flow
作者:	Chen,MH;Hong,ZC
贡献者:	機械工程研究所
关键词:	PROBABILITY DENSITY-FUNCTION;REYNOLDS-STRESS;SHEAR FLOWS;VELOCITY CORRELATION;EQUATION;MODEL
日期:	1999
上传时间:	2010-06-29 18:02:59 (UTC+8)
出版者:	中央大學
摘要:	This study presents the application of a turbulence probability density function (pdf) equation to compute an axisymmetric turbulent free jet flow. II; 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-or der 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 ap pear to be more suitable than conventional moment-closure models in terms of revealing turbulence structure.
關聯:	JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
显示于类别:	[機械工程研究所] 期刊論文

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