Vortex-induced vibrations of flexible cylinders predicted by wake oscillator model with random components of mean drag coefficient and lift coefficient

In the present study, vortex-induced vibrations in both In-Line and Cross-Flow directions of long flexible cylinders within a uniform flow are predicted by modified wake oscillator model. detail, Van der Pol's model with drag lift coefficients being modelled as random variables. The statistics force coefficient, i.e. mean value standard deviation, extracted from literature reporting experimental measurements numerical simulation results forces experienced cylinder-type structure. With statistics, series pseudo stochastic variables generated to calculate forces. Euler-Bernoulli equation governing motion cylinder, tension is function velocity. Through comparing predictions without randomness results, it found that scatter vibration amplitudes, multi-frequency effect (broadband process) frequency multiplication successfully reproduced randomly drawn coefficients. However, overestimate oscillation for implies coupling still topic deserves further investigation. • A predict vibrations. new schemes generate pseudo-random representing scheme between structural Frequency effects realistically