Flow and roller array interaction at low Reynolds numbers

摘要: Differing from the conventional no-slip wall boundary condition, moving surface may have strong influences on flow structures and physics. Such effects are potentially important useful for control. In this paper we analyze two-dimensional over a roller array with different spacing rotating speeds at low Reynolds numbers. The numerical results indicate that pressure drag friction of rollers strongly dependent flowing geometric parameters. Physically, motion can induce viscous traction stream, which leads to very effects, such as so called impingement block stream flush. These interesting findings help better understand fluid dynamics general cases.