Abstract
The response of mean turbulent energy dissipation rate and spectra to concentrated suction applied through a porous wall strip has been quantified. Both suction and no suction data of the spectra collapsed reasonably well for Kolmogorov normalised wavenumber k *1 > 0.2. Similar results were also observed for second-order structure functions (not shown) for Kolmogorov normalised radius r* < 10. Although, the quality of collapsed is poorer for transverse component, the result highlights that Kolmogorov similarity hypothesis is reasonably well satisfied. However, the suction results shows a significant departure from the no suction case of the Kolmogorov normalised spectra and second-order structure functions for k *1 < 0.2 and r* > 20, respectively. The departure at the larger scales with collapse at the small scales suggests that suction induce a change in the small-scale motion. This is also reflected in the alteration of mean turbulent energy dissipation rate and Taylor microscale Reynolds number. This change is a result of the weakening of the large-scale structures. The effect is increased as the suction rate is increased.
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RAA acknowledged the support of the Australian Research Council.
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Oyewola, O., Djenidi, L. & Antonia, R.A. Response of mean turbulent energy dissipation rate and spectra to concentrated wall suction. Exp Fluids 44, 159–165 (2008). https://doi.org/10.1007/s00348-007-0386-z
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DOI: https://doi.org/10.1007/s00348-007-0386-z