In this paper, studies on the turbulent vortex structures in the wake of a fixed cylinder with helical strakes are investigated experimentally. The effect and mechanism of a triple helical strake system on suppression of vortex induced vibrations (VIV) are investigated experimentally in a water tunnel. Strakes with a length of 25D in pitch and 0.1D & 0.2D in height are fitted onto a rigid cylinder of diameter D=12mm, and subjected to a transverse water flow. The numerical computation of the vorticity fields is also conducted to understand more on the VIV suppression using helical strakes.
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