Vortex shedding is due to flow over an obstruction in the flow path. At certain flow velocities, the fluid boundary layer at the trailing edge will separate, or cause vortices that are shed from either side of the obstruction.
The shedding alternates at regular time intervals and therefore produces an oscillating pressure field pulsation. The pulsation can then drive vibration of the obstruction and/or other components of the system. Some common types of problems associated with flow induced vibration (FIV) are:
Field tests in conjunction with calculations are generally required to identify the obstruction which is producing the vortices. Pulsation and vibration measurements are essential to obtain solutions to vibration problems caused by FIV.