Abstract

In this paper, our in-house RANS solver, naoe-FOAM-SJTU, developed using OpenFOAM is applied to numerically simulate the VIM of a 2-D circular cylinder with low mass-damping. The response and vortex modes of an elastically mounted rigid circular cylinder constrained to oscillate transversely to a free stream are numerically investigated. Computations are carried out for reduced velocities from 1.5 to 13, corresponding to a range of 1500 to 13000 in Reynolds number. The mass ratio is 2.4 and the mass-damping is 0.013. These parameters are set to be identical with those of the benchmarking experiment conducted by Khalak and Williamson (1996). The beating phenomenon in initial branch is supported by two peak in FFT analysis. One difference in the response of cylinder between present study and experiment results from the system's tendency to keep its earlier state. The intermittent change of vortex modes at U*= 2.9375, which corresponds to maximum amplitude of vibration, indicates the upper branch should be described as intermittent switching between initial and lower branch. The computational results of response of cylinder and the vortex mode in the wake are in good agreement with the experimental results except for the absence of upper branch.

Keywords:
displacement, coefficient, upper branch, amplitude, williamson, vibration, cylinder, equation, computation mesh, lower branch
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2014. International Society of Offshore and Polar Engineers
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