LES calculation for uniform flow past a rotationally oscillating cylinder
Two- and three-dimensional computations of flow past a rotationally oscillating cylinder are carried out at Re=150 and 1.5×104, respectively, to study the effectiveness of drag reduction through rotary oscillation of a cylinder. The turbulent wake is modeled by an LES technique. Two forcing amplitud...
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Veröffentlicht in: | Journal of fluids and structures 2013-10, Vol.42, p.40-54 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Two- and three-dimensional computations of flow past a rotationally oscillating cylinder are carried out at Re=150 and 1.5×104, respectively, to study the effectiveness of drag reduction through rotary oscillation of a cylinder. The turbulent wake is modeled by an LES technique. Two forcing amplitudes Ω=0.5 and 2 with a wide range of forcing frequency fe are considered. The mean drag has a sharp increase during the lock-on range, and then decreases continuously to a minimum value. Up to 57% of drag reduction is achieved at Re=1.5×104. As the forcing frequency further increases, the effect of cylinder oscillation diminishes and the mean drag approaches the value of flow past a stationary cylinder. Several different wake patterns, due to the variation of forcing frequency fe, are observed by computational streaklines. |
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ISSN: | 0889-9746 1095-8622 |
DOI: | 10.1016/j.jfluidstructs.2013.05.008 |