Numerical study of turbulent flow over complex topography by LES model

The present work is devoted to develop a numerical wind tunnel to study the local turbulent flow fields over complex topography by using large eddy simulation. Firstly, the mean and turbulence flow over flat terrain and that over a steep 3-dimensional circular hill were simulated and the accuracy of these computations was assessed by comparing the results with those from the experiment. Then the simulations about a real complex topography with two different radius were carried out and the comparison with observation shows that, even the measured point is located with a distance 10 times the height of an upstream tall hill, the wake effect is still very large and in order to provide a good prediction that tall hill should be included in the simulated region.