Studying Planar Vortex Flow With COMSOL Multiphysics

Partial differential equations could describe the nature of physical phenomena clearly, it gives the relationships between the various field quantities, the finite element method is the most widely used numerical method at the same time. In this paper, the advantages of them are combined. The description physical phenomena of partial differential equations and finite element method are used to analysis the representative plane vortex flow.Backward-facing step flow has been calculated and compared with other numerical methods we obtained that the impact of the length of the recirculation zone not only decided by Reynolds, but also decided by the characteristic scale, characteristic velocity, and the fluid viscosity. At the same time we gave the ranges of Reynolds number while the vortex appears near the upper-wall.Cavity flow was computed under steady and unsteady situations. We analysis the relative position of the center of the vortex at each Reynolds number under the unsteady flows, as well as the distribution of the velocity on the vertical and horizontal center line of the cavity. While the flat side of the chamber was unsteady flow calculation and analysis, obtained at low Reynolds number flows tend to the steady flow situation, and given the size of calculation under article critical Reynolds number. Furthermore, we considered under the navies vibrating and superimposed uniform speed, the evolution of the cavity vortex flow.