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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

DIRECTIONAL SCALE DEPENDENCY ON FORCE COUPLING FOR DISPERSED TWO-PHASE TURBULENT FLOWS

pages 99-104
DOI: 10.1615/TSFP2.900
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要約

The mechanism of energy transport by particles in a turbulent channel flow was investigated by large eddy simulation considering directional scale dependency on force coupling between particles and turbulence. The present coupling method introduced the weighted function to distribute the momentum to grid points in a wider region considering the energy backscatter enhanced by particles when the inter-particle spacing was comparable to half of the energy-containing eddy scale, which was ensured by the experiments by Sato et al (2001). The coupling method using both the gaussian and wavelet-like functions were examined and it was found that a distribution scale has a significant influence on modification to fluid turbulence. The expansion of the momentum-distribution scale in the streamwise direction in the order of half of the energy-containing eddy scale realized the directional scale-dependent structure of turbulence modification by particles.

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