Abstract
The pressure-strain correlation is studied in detail using the direct numerical simulation data obtained by a direct Monte-Carlo simulation of turbulent drag reduction in a channel flow caused by rigid fiber additives. This is used to analyze the energy redistribution process and to explain the pronounced anisotropy of the drag-reduced flow as compared to its Newtonian counterpart. Moreover, the change in pressure fluctuations and strain-rate fluctuations are studied to explain the modifications in the pressure-strain term. It is found that the reduction in strain-rate fluctuations is mainlyresponsible for the change in the pressure-strain term and the effect of pressure fluctuations is modest.
| Original language | English |
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| Article number | 025101 |
| Journal | Physics of Fluids |
| Volume | 28 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Feb 2016 |