Hydrodynamic Forces on Multiple Free-hanging Circular Cantilevers in Uniform Flows

摘要

An experimental study has been carried out to investigate time-dependent hydrodynamic forces on 2 different triangular configurations of 3 flexible free-hanging circular cantilevers with a free-end condition and subjected to uniform cross-flows. Each cantilever has a 34.4 aspect ratio and a low mass ratio of 1.24. The Reynolds number varied from 10,800 to 37,800. Four variations on the gap between upstream and downstream cylinders (L_(UD)) were considered. The results demonstrated that at high reduced velocities (Ur), the drag-lift frequency ratios were independent of the parameters Ur and L_(UD). At moderate Ur, the configuration with 2 cylinders at the downstream position produced significantly higher total forces on the downstream cylinders.