Large Eddy Simulation of high-Reynolds number flow past a rotating cylinder

Karabelas, SJ

dc.contributor.author	Karabelas, SJ	en
dc.date.accessioned	2014-03-01T01:33:41Z
dc.date.available	2014-03-01T01:33:41Z
dc.date.issued	2010	en
dc.identifier.issn	0142727X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20536
dc.subject	Load stability	en
dc.subject	Magnus effect	en
dc.subject	Rotating cylinder	en
dc.subject	Turbulence	en
dc.subject.other	Circumferential speed	en
dc.subject.other	Commercial codes	en
dc.subject.other	Constant loads	en
dc.subject.other	Critical value	en
dc.subject.other	Discretization scheme	en
dc.subject.other	Experimental data	en
dc.subject.other	Free-stream	en
dc.subject.other	High-Reynolds number	en
dc.subject.other	Karman vortex street	en
dc.subject.other	Load stability	en
dc.subject.other	Magnus effect	en
dc.subject.other	Rotating cylinder	en
dc.subject.other	Rotating cylinders	en
dc.subject.other	Smagorinsky model	en
dc.subject.other	Spin ratio	en
dc.subject.other	Sub-critical	en
dc.subject.other	Sub-grid scale models	en
dc.subject.other	Time units	en
dc.subject.other	Time-averaged	en
dc.subject.other	Uniform flow	en
dc.subject.other	Vortex shedding process	en
dc.subject.other	Aerodynamics	en
dc.subject.other	Atmospheric boundary layer	en
dc.subject.other	Flow simulation	en
dc.subject.other	Hydraulics	en
dc.subject.other	Large eddy simulation	en
dc.subject.other	Reynolds number	en
dc.subject.other	Rotation	en
dc.subject.other	Rotors	en
dc.subject.other	Spin dynamics	en
dc.subject.other	Turbulence	en
dc.subject.other	Vortex flow	en
dc.subject.other	Vortex shedding	en
dc.subject.other	Cylinders (shapes)	en
dc.title	Large Eddy Simulation of high-Reynolds number flow past a rotating cylinder	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijheatfluidflow.2010.02.010	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijheatfluidflow.2010.02.010	en
heal.publicationDate	2010	en
heal.abstract	In the present study, uniform flow past a rotating cylinder at Re=140,000 is computed based on Large Eddy Simulation (LES). The cylinder rotates with different spin ratios varying from a=0 to a=2, where a is defined as the ratio of the cylinder's circumferential speed to the free-stream speed. The Smagorinsky model is applied to resolve the residual stresses. The present commercial code is validated based on available numerical and experimental data. The results agreed fairly well with these data for the cases of the flow over a stationary and over a rotating cylinder. As the spin ratio increases, the mean drag decreases and the mean cross-stream force acting to the cylinder increases. The vortices (time-averaged) downstream of the cylinder are displaced and deformed and the vortex that is close to the region of the fluid's acceleration shrinks and eventually collapses. By increasing a, the flow is also stabilized. It is observed that the vortex shedding process is suppressed. Specifically, the flow is unstable in load terms for spin ratios up to 1.3. After this critical value, the flow is transitional for a few dimensionless time units demonstrating the well-known von-Karman vortex street and then it becomes stable with almost constant loads. An encouraging outcome resulting from this study is that the LES computations could be accurate for high-Re sub-critical flows with grids of medium resolution combined with a validated sub-grid scale model and a low-diffusive discretization scheme. © 2010 Elsevier Inc.	en
heal.journalName	International Journal of Heat and Fluid Flow	en
dc.identifier.doi	10.1016/j.ijheatfluidflow.2010.02.010	en
dc.identifier.volume	31	en
dc.identifier.issue	4	en
dc.identifier.spage	518	en
dc.identifier.epage	527	en