WIV of two tapered circular cylinders in tandem arrangement

In many practical situations, the cylinders are found in a specific arrangement and have different transverse vibration response from isolated cylinders. In the most simplified case one can consider two rigid circular cylinders with the same diameter in tandem arrangement. In this simple configuration the upstream cylinder is fixed and the downstream cylinder is flexibly mounted. In the present study the cross flow and inline vibration amplitudes (of the downstream tapered cylinder) of two tapered circular cylinders in tandem arrangement are presented. The single degree of freedom vibrating system (i.e. the downstream cylinder either in transverse or stream-wise directions) has a low mass-damping parameter ( m*  0.0408 ). The Reynolds number, based on mean diameter of the cylinders, ranges from 1,400 to 19,600 and the reduced velocities vary from 1 to 22. Various separations (S/D) from 2 to 7 are studied. The trend of transverse responses of the downstream tapered cylinder in tandem arrangement is generally the same as that of the uniform cylinder. This implies that the introduction of three dimensionality to the flow field and more irregularity in vortex shedding from the upstream (tapered) cylinder does not have any significant effect on the downstream tapered cylinder responses

کلیدواژه ها:

WIV ، Tapered cylinders ، Tandem arrangement ، Transverse vibration