Waving Motions of Flags

Abstract

The waving motions of flags are investigated experimentally in a wind tunnel. Several cases are examined: when a flag is placed in a uniform flow, when a flag is placed in a one-sided flow, and when a splitter plate is placed in the wake of a flag. The wave mode, the wave form, the wave velocity, the frequency and the drag are determined for many kinds of flags at Reynolds numbers ranging from 10 3 to 3×10 5 .