Large eddy simulation of dispersion of particles in turbulent jets

Wu, Zhilei and Fuchs, László (2001) Large eddy simulation of dispersion of particles in turbulent jets. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 2 (1). pp. 21-35. ISSN 1586-2070

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Abstract

The objective of this study is to closely investigate the interaction between turbulence and particles in a free jet. The round jet is loaded with heavy but small particles. The continuous phase is simulated using LES while particles are tracked using a agrangian (LPT) approach. The particle volume fraction is supposed to be small enough to exclude direct particle-particle interactions. We have also considered the case of one-way interaction in which the particles have no effect on the continuous phase turbulence. The effect of the large vortex ring structures on particle dispersion has been studied. Particles with Stokes numbers in the range 0.03 to 10 have been considered. The computed results have been compared to our simultaneous double PIV measurements. The computed and the experimental results show very good agreement for the spatially developing jet both in terms of mean quantities as well as in terms of the correlation between the fluctuating velocities of the two phases. For forced jets the phase averaged particle concentration field shows that particles of different sizes tend to form particle-size dependent regions with high particle concentrations.

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