Session: FSI-02-01 Flow-induced Vibration I

Paper Number: 62989

Start Time: Tuesday, July 13, 2021, 05:00 PM

62989 - Flow-Induced Vibration in a Single Row of Cylinders With p/D = 1.26 

Crossflow over a row of cylinders with a low space ratio presents an asymmetric configuration with large and narrow wakes behind the cylinders. Crossflow over lines of cylinders with a small space ratio increases the interaction of shear layers since the cylinders are in the wake of the preceding cylinder. The interaction between the cylinder and its wake can impact the vibration response of the cylinders. In tube banks, it results in damages to the equipment. The present experimental study aims to analyze the influence of close space observed in a single row and a line of cylinders on the flow-induced vibration.  The study compares a single row and a single line with fixed cylinders and a single row and a single line with one cylinder free to vibrate. The cylinder free to vibrate is tested in several positions. The study was conducted in an aerodynamic channel with cross-section 0.193 x 0.146 m and smooth cylinders with a diameter of 25.1 mm; the space ratio is 1.26. The measurements were executed with hot wire anemometry and accelerometers. The Reynolds number ranged between 1.0 x 104 and 4.5 x 104, obtained with the reference flow velocity, measured with a Pitot tube, and the cylinder diameter. The comparison between the wake response for a single row and a single line fixed and a single row and a single line with one cylinder free to vibrate was executed using Fourier and wavelet transforms. The comparison with models presented in the literature to predict fluid elastic instability in a single row of cylinders is presented.

Presenting Author: Sergio Viçosa Möller Universidade Federal do Rio Grande do Sul

Authors:

Roberta Fátima Neumeister Universidade Federal do Rio Grande do Sul
Adriane Prisco Petry Universidade Federal do Rio Grande do Sul
Sergio Viçosa Möller Universidade Federal do Rio Grande do Sul