Numerical simulation of roughness effects on the flow past a circular cylinder
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10.1088/1742-6596/745/3/032043
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/97516
Tipus de documentText en actes de congrés
Data publicació2016
EditorInstitute of Physics (IOP)
Condicions d'accésAccés obert
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continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
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Reconeixement 3.0 Espanya
Abstract
In the present work large eddy simulations of the flow past a rough cylinder are performed at a Reynolds number of Re = 4.2 × 105 and an equivalent sand-grain surface roughness height ks = 0.02D. In order to determine the effects of the surface roughness on the boundary layer transition and as a consequence on the wake topology, results
are compared to those of the smooth cylinder. It is shown that surface roughness triggers the transition to turbulence in the boundary layer, thus leading to an early separation caused by the increased drag and momentum deficit. Thus, the drag coefficient increases up to CD 1.122 (if compared to the smooth cylinder it should be about CD 0.3 - 0.5).
The wake topology also changes and resembles more the subcritical wake observed for the smooth cylinder at lower Reynolds numbers than the expected critical wake at this Reynolds number.
CitacióRodriguez, I., Lehmkuhl, O., Piomelli, U., Chiva, J., Borrell, R., Oliva, A. Numerical simulation of roughness effects on the flow past a circular cylinder. A: European Thermal-Sciences Conference. "Journal of Physics: conference series, vol. 745, 2016". Krakow: Institute of Physics (IOP), 2016, p. 1-8.
ISBN1742-6596
Versió de l'editorhttp://iopscience.iop.org/article/10.1088/1742-6596/745/3/032043/meta
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