Abo Bibliothek: Guest
Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

EFFECT OF INITIAL CONDITIONS IN THE NEAR AND FAR FIELDS OF A CO-FLOWING JET

pages 853-858
DOI: 10.1615/TSFP4.1430
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ABSTRAKT

The effect of initial conditions on the self preservation of a spatially developing coflowing jet was investigated numerically using LES. Four different initial conditions were used, which involve altering the mean velocity profile and turbulence intensity at the jet origin. The co-flow to jet bulk velocity ratio was 1:11, and, the ratio of jet orifice diameter to co-flow diameter was 1:35. The 135D × 35D simulation volume was divided into 1024 × 256 × 128 control volumes in the x, r and z directions, respectively. Time averaged results of the effect of initial conditions on mean flow, the decay of jet centreline velocity, growth of the jet and the distribution of Reynolds stresses in the near and far field are presented. The overall good agreement between the simulation results and the experimental results of Nickels and Perry (1996) under similar initial conditions partially supports the Reynolds number similarity hypothesis of Townsend (1976). The present results suggest that the first order moments have very little dependence on either of the initial conditions while the Reynolds shear stress appears to have lesser sensitivity to the variation of initial velocity profiles. However, initial conditions appear to have a pronounced effect on the self-similarity of normal stresses.

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