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- W4384389845 abstract "Wall-pressure fluctuations are a practically robust input for real-time control systems aimed at modifying wall-bounded turbulence. The scaling behaviour of the wall-pressure--velocity coupling requires investigation to properly design a controller with such input data, so that the controller can actuate upon the desired turbulent structures. A comprehensive database from direct numerical simulations of turbulent channel flow is used for this purpose, spanning a Reynolds-number range $Re_tau sim 550 - 5200$. A spectral analysis reveals that the streamwise velocity is most strongly coupled to the linear term of the wall-pressure, at a wall-scaling of $lambda_x/y approx 14$ (and $lambda_x/y approx 8.5$ for the wall-normal velocity). When extending the analysis to both homogeneous directions in $x$ and $y$, the peak-coherence is centred at $lambda_x/lambda_z approx 2$ and $lambda_x/lambda_z approx 1$ for $p_w$ and $u$, and $p_w$ and $v$, respectively. A stronger coherence is retrieved when the quadratic term of the wall-pressure is concerned, but there is only weak evidence for a wall-attached-eddy type of scaling. Experimental data are explored in the second part of this work: wall-pressure data are denoised and subsequently used for predicting the binary-state of the streamwise velocity fluctuations in the logarithmic region. A binary estimation accuracy of up to 72% can be achieved by including both the linear and quadratic terms of the wall-pressure. This study demonstrates that a controller for wall-bounded turbulence (solely relying on wall-pressure data) has merit in terms of a sufficient state estimation capability, even in the presence of significant facility noise." @default.
- W4384389845 created "2023-07-15" @default.
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- W4384389845 date "2023-07-12" @default.
- W4384389845 modified "2023-09-25" @default.
- W4384389845 title "Wall-pressure--velocity coupling in high-Reynolds number wall-bounded turbulence" @default.
- W4384389845 doi "https://doi.org/10.48550/arxiv.2307.06449" @default.
- W4384389845 hasPublicationYear "2023" @default.
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