Flow induced vibration focuses on flow analysis and fatigue design. Vortex induced vibration (VIV) is probably the most common type of flow-induced vibration. It is caused by oscillating flow separation from a structure. Circular cylindrical structures are particularly susceptible to VIV and breaking the circular or cylindrical symmetry of the structure, by using strakes for instance, is an effective way of reducing the amplitude of vibration and the resulting stresses.