- Title
- Response of mean turbulent energy dissipation rate and spectra to concentrated wall suction
- Creator
- Oyewola, O.; Djenidi, L.; Antonia, R. A.
- Relation
- Experiments in Fluids Vol. 44, Issue 1, p. 159-165
- Publisher Link
- http://dx.doi.org/10.1007/s00348-007-0386-z
- Publisher
- Springer Verlag
- Resource Type
- journal article
- Date
- 2008
- Description
- 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 k₁* > 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 k₁* < 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.
- Subject
- energy dissipation; function evaluation; porous materials; Reynolds number; turbulent flow
- Identifier
- http://hdl.handle.net/1959.13/43003
- Identifier
- uon:5137
- Identifier
- ISSN:0723-4864
- Language
- eng
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