抄録
It is very important to accurately predict local wind field over a two-and three-dimensional steep topography, such as a ridge and a hill, because these results on separated flow provide some understanding of how a specified approaching airflow should be modified over complex terrain. In the present study, we have performed the three-dimensional direct numerical simulation (DNS) of a non-stratified airflow over a two-dimensional steep ridge. The numerical results are compared with those of two-dimensional DNS results. In addition, the wind tunnel experient is also conducted by using a smoke wire technique. Through a comparison between the numerical and experimental results, the unsteady vortex shedding from a two-dimensional steep ridge is investigated in detail. As a result, the difference in the unsteady vortex shedding between two- and three-dimensional calculations is clearly found.
