Three-dimension Turbulent Numerical Simulation For Flow Around A Wing

The phenomenon of turbulent flow widely exists in all kinds of areas including nature, industry, our daily lives and so on. It has been a long history since we did numerical simulation about turbulent flow, but because of its complexities of unsteady, revolved, three-dimensions, we haven't found a turbulent model that can simulate every turbulent flow now. One turbulent model only can be fit for certain flows, and now we are still searching for more suitable turbulent model for a certain flow to do numerical simulation ,which is very valuable not only for theoretical research but also for practical application. In this paper, three turbulent models have been chosen: standard k-ε model, low Reynolds k-ε model and Prandtl's mixing length model to simulate the flow around a wing, we use finite element method to discrete N-S equation, unstructured grid method to generate grid. And we get some information about the separation in boundary layer. By comparing numerical simulation result with the experiment result in vortex, velocity field, pressure filed and pressure coefficient we find that Prandtl's mixing length model can well describe the flow around a wing but the low Reynolds k-ε model is not good enough, and standard k-ε model is not fit for the problems which have separation flow in boundary layer.On the base of well done by Prandtl's mixing length model for this flow, we have simulated the flow around a wing with different angle of attack. And it got some flow characteristics about the flow around a wing with different angle of attack. And we also found that separate eddy become stronger with the increase of angle of attack at the end of wing.