Three dimensionality in the wake of the flow around a circular cylinder at Reynolds number 5000
Visualitza/Obre
10.1016/j.compfluid.2017.02.004
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/103891
Tipus de documentArticle
Data publicació2017-04-02
EditorElsevier
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
The turbulent flow around a circular cylinder has been investigated at Re=5000Re=5000 using direct numerical simulations. Low frequency behavior, vortex undulation, vortex splitting, vortex dislocations and three dimensional flow within the wake were found to happen at this flow regime. In order to successfully capture the wake three dimensionality, different span-wise lengths were considered. It was found that a length LZ=2pDLZ=2pD was enough to capture this behavior, correctly predicting different aspects of the flow such as drag coefficient, Strouhal number and pressure and velocity distributions when compared to experimental values. Two instability mechanisms were found to coexist in the present case study: a global type instability originating in the shear layer, which shows a characteristic frequency, and a convective type instability that seems to be constantly present in the near wake. Characteristics of both types of instabilities are identified and discussed in detail. As suggested by Norberg, a resonance-type effect takes place in the vortex formation region, as the coexistence of both instability mechanisms result in distorted vortex tubes. However, vortex coherence is never lost within the wake.
CitacióAljure, D.E., Lehmkuhl, O., Rodriguez, I., Oliva, A. Three dimensionality in the wake of the flow around a circular cylinder at Reynolds number 5000. "Computers and fluids", 2 Abril 2017, vol. 147, p. 102-118.
ISSN0045-7930
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S0045793017300488
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
pagination_CAF_3393-cylinder.pdf | 6,062Mb | Visualitza/Obre |