FSI: Assessing Potential Flow-Induced Vibration

Research Case Study

The purpose of this study was to design and position a lance such that failure due to flow-induced vibration will not occur.

About This Project: Purpose and Methodology

Why Study Flow-Induced Vibration?

Flow-induced vibration occurs when strong aerodynamic forces from the passing flow produce loading forces on objects in the flow. In the spray field, high velocity process fluids pass across long slender piping structures, such as a lance, causing vibration. This leads to potential structural failure and the most concerning scenarios involve strong shedding frequencies, which, if matching the natural frequency of the support structure, can cause catastrophic failure due to unbounded mechanical vibration amplification. Vibration studies are necessary to ensure mechanical integrity of both the structure and the lances


FSI techniques use CFD and FEA to analyze the system with coupling mechanisms. The simulation is performed through a multi physics solver by transferring results between the structural and fluid domain. The method uses a structural mesh with applied CFD results mapped at defined node locations.

More about this Project: Results and Insights


By capturing the complicated dynamics and interactions of the gas flow, liquid spray, and mechanical stresses safe and reliable spray equipment may be verified for optimal spray placement and distribution in harsh processes.

What Does this Mean?

In the end, we can design, develop and position a lance in such a way that flow-induced vibration does not occur.

Fluid Structure Interaction (FSI)

We perform assessments like these stress analysis simulations to ensure that nozzles, lances, injectors, and headers do not experience extreme forces that may result in hardware failure. Among other applications, FSI is popular in vortex shedding.