The organised motion in a turbulent channel flow with a succession of square bars on the bottom wall has been investigated using direct numerical simulations. Several values of the ratio w/k, where k is the bar height and w is the longitudinal separation between consecutive bars have been examined in detail. Relative to a smooth surface, the streamwise extent of the near-wall structures is decreased while their spanwise extent is increased. As w/k increases, the coherence decreases in the streamwise direction having a minimum for w/k = 7. This is due to the outward motion occurring, most of all, near the leading edge of the elements. The Reynolds stress anisotropy tensor and its invariants show a closer approach to isotropy over the rough wall than over a smooth wall.
Structure of turbulent channel flow with square bars on one wall / Leonardi, S.; Djenidi, L.; Orlandi, Paolo; Antonia, R. A.. - In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW. - ISSN 0142-727X. - 25/3(2004), pp. 384-392. [10.1016/j.ijheatfluidflow.2004.02.022]
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Titolo: | Structure of turbulent channel flow with square bars on one wall | |
Autori: | ||
Data di pubblicazione: | 2004 | |
Rivista: | ||
Citazione: | Structure of turbulent channel flow with square bars on one wall / Leonardi, S.; Djenidi, L.; Orlandi, Paolo; Antonia, R. A.. - In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW. - ISSN 0142-727X. - 25/3(2004), pp. 384-392. [10.1016/j.ijheatfluidflow.2004.02.022] | |
Handle: | http://hdl.handle.net/11573/40349 | |
Appartiene alla tipologia: | 01a Articolo in rivista |