Visualization of internal flow of tornado generator

We attempt to develop the compact, non-exhaust, potable tornado generator with centrifugal impeller and vortex casing, which generates tornado like vortex funnel. To optimize the impeller and casing design, numerical simulations and experimental investigations are carried out. In the design optimization, numerical visualization plays an important role for understanding three dimensional flow field. An artificial tornado is also visualized by using polystyrene tracers in the water tank as simulation of the room space.