An investigation of the flow modification in a turbulent channel with gain-based optimal forcing
ORAL
Abstract
Direct numerical simulations of turbulent channel at Re$_{\mathrm{\tau \thinspace }}=$ 180 with two-dimensional traveling wave forcing are performed. The chosen forcing parameters, that is, the wall-parallel wavelength and wave-speed, are representative of the near-wall cycle. The wall-normal forcing shape is obtained using the resolvent analysis of McKeon {\&} Sharma (Journal of Fluid Mechanics, vol. 658, 2010). The results obtained from direct simulations are found to compare well with the resolvent analysis predictions for different forcing amplitudes. The turbulence statistics and visualizations of three-dimensional unsteady flow field shed light on the flow evolution in response to forcing.
*The support for this work was provided by AFOSR under grant number FA9550-12-1-0469 and the computational resources were provided by Texas Advanced Computing Center (TACC)
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