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- W2466366213 abstract "The present study involves Direct Numerical Simulations (DNS) of a turbulent channel flow subject to spatially modulated thermal forcing with a special interest to realize reduction of skin-friction drag. Thermal forcing has been employed using both streamwise and transverse arrays of heated strips on the bottom wall of the channel. The simulations have been carried out for a fixed friction Reynolds number Reτ=180 with friction Richardson number Riτ varying from 15 to 30. The periodic transverse strips exhibited an increase in skin-friction drag with a decrease in the width of hot strips though wider hot strips exhibit a slight decrease in skin-friction drag. Streamwise periodic strips exhibited a reduction in skin-friction drag of the order of 8% with an increasing trend in reduction of friction drag with increasing Riτ. The mechanism responsible for turbulent skin-friction drag reduction due to streamwise thermal forcing affects two processes, namely: (a) advection of streamwise kinetic energy from the buffer-layer to outer layer by the wall-normal buoyancy forces leading to formation of broader low-speed streaks over the heated regions and (b) brings about suppression of cross-flow fluctuating velocities which in turn weakens the transient growth of the turbulent streaks." @default.
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- W2466366213 date "2016-10-01" @default.
- W2466366213 modified "2023-09-26" @default.
- W2466366213 title "Turbulent drag reduction using active control of buoyancy forces" @default.
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- W2466366213 doi "https://doi.org/10.1016/j.ijheatfluidflow.2016.07.003" @default.
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