Abstract
Direct Numerical Simulations (DNS) of a passive scalar in a turbulent channel flow with a normal velocity disturbance on the lower wall are presented for high and low Reynolds numbers. The aim is to reproduce the complex physics of turbulent rough flows without dealing with the geometric complexity. In addition, isothermal walls that cannot be easily assigned in an experiment, are considered. The paper explains the increase of heat transfer through the changes of the velocity and thermal structures. As in real rough flows, the transpiration produces an isotropization of the turbulence near the wall.
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Orlandi, P., Leonardi, S. Passive Scalar in a Turbulent Channel Flow with Wall Velocity Disturbances. Flow, Turbulence and Combustion 72, 181–197 (2004). https://doi.org/10.1023/B:APPL.0000044411.85770.34
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DOI: https://doi.org/10.1023/B:APPL.0000044411.85770.34