VIV of two cylinders in tandem arrangement: analytical and numerical modeling.

Vortex-induced vibrations of two circular cylinders in tandem arrangement are studied both analytically and numerically. A low-order model for transverse vortex-induced vibrations of one degree-offreedom elastically supported rigid cylinders is analyzed. The model, based on van der Pol oscillators, is first developed addressing the response of a single structure, and then extended to describe vortexinduced oscillations of two interfering circular cylinders in tandem arrangement. Its properties are evaluated analytically and show qualitative and quantitative agreement with both experimental results and flow-field numerical models. In the numerical modeling, the twodimensional turbulent flow around the cylinders is computed using a specifically designed numerical method.

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