Numerical Study on the unsteady flow fields around a building in a tornado like vortex

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A numerical tornado simulator was developed. It can generate various types of tornado like vortices numerically by Large Eddy Simulation. A series of unsteady flow fields of vortex were generated and examined the flow characteristics with varying the inflow conditions, the boundary conditions, and the configuration of calculating domain. The normalized differential mean pressure indicates almost equivalent magnitude of -1.5 at the radius of maximum mean tangential speed, Rtmax and also the absolute mean wind speed shows the half of the maximum mean tangential speed at the radius of 3 Rtmax irrespective of core type of vortex. The unsteady flow fields and the pressure fields around a building put in the vortex was examined. The function of the calculating the trajectories of missiles released in the vortex was also installed in the tornado simulator and the trajectories of simple shaped missile were tested.