Prescribed motion flow dynamics
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The numerical analysis of a circular cylinder undergoing oscillations in a two-dimensional laminar flow pattern, is performed in this paper. The cylinder is subjected to forced oscillations transverse to the free stream flow. A detailed analysis is presented for prescribed frequency ratios which are half, equal and double to that of the vortex shedding frequency. The prescribed motion amplitudes investigated range from 10–100 % of the cylinder diameter, at a fixed Reynolds number of 100. Detailed characteristics and field analysis of prescribed motion dynamics is presented in the paper. When the prescribed frequency matches shedding frequency, phase transition between transverse pressure force and displacement is witnessed along with the existence of a critical amplitude. The pressure distribution and evolution of wake contours with respect to the cylinder motion and excitation frequency is critically analysed to develop insight of the load development in the cylinder-fluid coupled system.
KeywordsOscillating cylinder Vortex shedding Wake structure Pressure Lift
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