Effect of high rotation rates on the laminar flow around a circular cylinder

• DOI: 10.1063/1.1492811
• Publication Date: 2002-09-18T17:44:03Z
• Authors: D. Stojković; M. Breuer; F. Durst
• Keywords: Lift (data mining); Vortex shedding

A two-dimensional numerical study on the laminar flow past a circular cylinder rotating with constant angular velocity was carried out. The objectives were to obtain consistent set of data for drag and lift coefficients wide range rotation rates not available in literature deeper insight into field vortex development behind cylinder. First, Reynolds numbers (0.01⩽Re⩽45) (0⩽α⩽6) considered steady regime, where α is circumferential at surface normalized by free-stream velocity. Furthermore, unsteady calculations out one characteristic number (Re=100) typical (2D) shedding regime varying 0⩽α⩽2. Additionally, investigations extended very high (α⩽12) which no exist literature. based finite-volume solver enhanced multi-grid acceleration local grid refinement technique achieve efficient computations accurate results. predictions show that suppresses both regimes significantly changes close For low numbers, force affected linear function α. higher Re decreases increasing rotational velocities even leading negative values. almost nearly independent speeds α<2. However, values larger (Re>1), progressive increase observed. interesting phenomenon found Re=100. (α⩽2) exhibits behavior known from literature, e.g., mean coefficient suppression beyond critical value about αL≈1.8. α≈5, an periodic motion wake characterized frequency much lower than normal shedding. change structure also leads distinct relation rotations asymptotically converges potential theory.