Wake interference of two identical oscillating cylinders in tandem: An experimental study

The interaction of two cylinders are studied through frequency analysis of both cylinders response motion to determine how upstream vortices impact the trailing cylinder response in stream-wise and cross-flow differently. It was observed that leading and trailing cylinders oscillate at different frequencies which is in contrast with results obtained from two fixed cylinders in tandem where both cylinders oscillate at the same frequency. Additionally, it is discussed how spacing controls the excitation mechanism.