Abstract
We present direct numerical simulation results from an on-going investigation of flow over a flexible cable. In particular, we compare forced cable vibration with flow-induced cable vibration at Reynolds numbers 100, 200 and 300. The cables are assumed to be infinitely long and periodic-we choose two spanwise wavelength cases: the “short” cable (L/d=12 ·6),and the “long” cable (L/d=45).We first examine the dynamics of the cable, concentrating on lift forces and the power produced by these lift forces. We then examine the flow structures in the wake of the vibrating cable. We observe a breakdown of a time-periodic cable and wake response going from Re=100 to Re=200. At Re=100 we observe relatively similar responses comparing the forced vibration case with the flow-induced vibration case, but at Re=200 differences become larger. Finally, we present a comparison with the experimental results of forced vibration by Ramberg and Griffin.
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