In DNS, drag reduction occurs when streak-scale wall transpiration is in-phase with wall pressure; out-of-phase roller-scale transpiration generates spanwise rollers and drag increase.
Journal of Computational Physics 113 (1), 1--4
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Coupled dynamics of wall pressure and transpiration, with implications for the modeling of tailored surfaces and turbulent drag reduction
In DNS, drag reduction occurs when streak-scale wall transpiration is in-phase with wall pressure; out-of-phase roller-scale transpiration generates spanwise rollers and drag increase.