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Applicability of large eddy simulations to capture turbulence attenuation in particle-laden channel flows
Journal
Physical Review Fluids
Date Issued
2022-02-01
Author(s)
Rohilla, Naveen
Muramulla, Pradeep
Goswami, Partha S.
Abstract
We report a critical assessment on the applicability of the large eddy simulation (LES) technique in predicting turbulence modulation due to the presence of particles with high Stokes numbers. The simulations have been performed for two Reynolds numbers of 3300 and 5600 based on average gas velocity and channel width. An increase in particle loading decreases the turbulence intensity, and at a particular volume fraction, the turbulence collapses due to the catastrophic reduction of turbulence production. It is observed that at low volume fractions, LES models predict the turbulence modulation with high accuracy (>80%) but fail to predict the volume fraction [critical particle volume loading (CPVL)] at which turbulence collapse happens. A detailed analysis shows that an inaccurate prediction of the turbulent energy production is the source of error in CPVL prediction. This is contrary to the usual understanding of the limitation of the LES models in predicting accurate energy dissipation.
Volume
7