论文和技术资料

In this paper, implicit Large Eddy Simulation (LES) based on finite-element analysis is performed in order to investigate two-dimensional circular cylinder incompressible flow. Implicit LES attempts time-dependent flow computation with no explicit turbulence model. Here, two types of circular cylinder with/without surface roughness, are treated. The Reynolds number Re based of the diameter of smooth surface circular cylinder is ranged from 0.1 to 1,000,000. Drag crisis of the circular cylinder w/o surface roughness was observed numerically. With surface roughness, the critical Reynolds number was reduced to around 10,000. This reduction of the critical Reynolds number is also well known in fluid dynamics. The movement of flow separation point was also clearly captured in this implicit LES.