We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Prograde and retrograde flow past cylindrical obstacles on a β-plane.
- Authors
Steinmoeller, D.; D'Alessio, S.; Poulin, F.
- Abstract
The problem of viscous prograde (eastward) and retrograde (westward) flow past a cylindrical obstacle on a β-plane is considered. The barotropic vorticity equation is solved using a numerical method that combines finite difference and spectral methods. A modified version of the β-plane approximation is proposed to avoid computational difficulties associated with the traditional β-plane approximation. Numerical results are presented and discussed for flow past a circular cylinder at selected Reynolds numbers ( Re) and non-dimensional β-parameters ( $${\hat{\beta}}$$) as well as for flow past an elliptic cylinder of a fixed aspect ratio ( r = 0.2) at inclination angles of ±15°, 90° and selected Re and $${\hat{\beta}}$$ . In prograde flows, it is found that the β-effect acts to suppress boundary-layer separation and to excite a standing Rossby lee wavetrain, as observed in previous works. In retrograde flows, the boundary-layer separation region is elongated and westward propagating Rossby waves are excited.
- Subjects
VORTEX motion; VISCOUS flow; REYNOLDS number; FINITE differences; ENGINE cylinder aerodynamics; SPECTRUM analysis; APPROXIMATION theory
- Publication
Acta Mechanica, 2011, Vol 217, Issue 1-2, p157
- ISSN
0001-5970
- Publication type
Article
- DOI
10.1007/s00707-010-0386-6