Well-resolved direct numerical simulations of turbulent open channel flows (OCFs) are
performed for friction Reynolds numbers up to. In summary, the free surface in OCFs plays …

Turbulent wakes are often characterized by dominant coherent structures over disparate
scales. Dynamics of their behaviour can be attributed to interscale energy dynamics and …

A spanwise traveling wave, generated by blowing and suction at walls, is applied in direct
numerical simulations to reduce the drag in a fully developed turbulent channel flow with R e …

A composite drag control (CDC) combining the opposition (OC) and spanwise opposed wall-
jet forcing (SOJF) methods is studied in a turbulent channel flow via direct numerical …

In nature, most microorganisms have flexible micro/nanostructure tails, which help them
create propulsion, reduce drag, or search for food. Previous studies investigated these …

Spanwise opposed wall-jet forcing has been shown to reduce the skin-friction drag of wall-
bounded turbulent flows by suppressing the near-wall turbulent motion (Yao et al., 2018). In …

The drag reduction efficacy of a large-scale flow control over a rough surface is studied via
direct numerical simulations of turbulent channels (at friction Reynolds numbers R e τ …

Vorticity transport in turbulent channels under large-scale active drag control (ie, spanwise
opposed jet forcing) is investigated via direct numerical simulation of the Navier–Stokes …

A novel decomposition method that adheres to both local time translation symmetry and
spatial rotational symmetry is proposed in this study, thereby extending the limitations of …

The compressibility effect on opposition drag control is studied via direct numerical
simulation of turbulent channel flows at a bulk Reynolds number Re b= 3000 for three …