Three-dimensional numerical simulations of linearly sheared flow past a circular cylinder have been performed for a shear parameter β of 0.02 and a mean Reynolds number of 131.5. Cylinders of aspect ratio (L/D) 24 and 48 have been considered. A second-order accurate finite volume scheme is used to integrate the unsteady Navier-Stokes equations. Present computations confirm both qualitatively and quantitatively, the aspects of cellular shedding as reported by several investigators through experimental studies. Cell dimensions varied between three and seven cylinder diameters. The non-dimensional frequencies of these cells are observed to be lower than those given by parallel shedding correlations at the equivalent Reynolds numbers. Shedding of vortices are observed to be oblique with dislocations appearing in time. Detailed distributions of vorticity and velocity components are presented to describe the flow. A near wake readjustment of the axial flow has been identified to be the main cause of lowering of the frequencies and sustenance of finite widths of coherent shear layers along the span.
|Original language||English (US)|
|Number of pages||24|
|Journal||Computers and Fluids|
|State||Published - Jan 2002|
ASJC Scopus subject areas
- Computer Science(all)