CFD of Tornado-like Vortices over Roughness Blocks

Abstract

Many waterspouts occrures in Japan, and sometimes make landfall.

In this study, the effects of surface roughness to tornado-like vortices were studied using CFD method, controling block height and distribution pattern.

When roughness blocks are distributed only the half of the region, the vortex was similar to the case when the same number of blocks are distributed uniformly over the whole region, but for the cases when blocks were tall.

It seems that when the gap of angular momentum among the region is quite large, flow cannot mixed in the vortex.