Fluid Structure Interaction (FSI)

In addition to the fluid mechanics modeling offered by Spraying Systems Co., stress analysis calculations can be performed to ensure that nozzles, lances, injectors, and headers do not experience extreme forces that may result in hardware failure. Strong forces can be experienced by flow passing through, or around, a hardware component. Past FSI modeling projects have examined:

  • Internal stress on a spray lance as a cross-flow shedding frequency excites a resonance in the lance body
  • Forces exerted on a spray header during a high-flow-rate co-flow

There are many areas of study relating to flow induced vibration, and one that is often seen in the injector/lance/nozzle realm of applications is vortex shedding. Typically, as fluid flows around a structure, the motion of the fluid around the solid can exert oscillating forces on the structure and may cause the structure to vibrate. Vortex shedding describes the unsteady flow that occurs as a fluid flows past the solid body, which may be capture through CFD modeling. Vortices are generated at the downstream side of the solid body and detach with an oscillating pattern from the body. If the structure is rigidly mounted and the frequency of the vortex shedding matches the resonance frequency of the solid body, the structure can resonate leading to damage or eventual failure. Detailed modeling of these Fluid Structure Interactions can be performed by Spray Analysis and Research services CFD engineers to avoid these situations.