Reduction in Turbulence-Induced Non-linear Dynamic Vibration Using Tuned Liquid Damper (TLD)

In this chapter, an attempt is made to develop a coupled non-linear turbulence-structure-damper model in a Finite Volume-Finite Difference (FV-FD) framework. A Tuned Liquid Damper (TLD) is used as the additional damping system along with inherent structural damping. Real-time simulation of flow-excited bridge box girder or chimney section and the vibration reduction using TLD can be performed using the developed model. The turbulent flow field around a structure is modelled using an OpenFOAM transient PISO solver, and the time-varying drag force is calculated. This force perturbs the structure, causing the sloshing phenomena of the attached TLD, modelled using shallow depth approximation, damping the flow-induced vibration of the structure. The structural motion with and without the attached TLD is modelled involving the FD-based Newmark-Beta method using in-house MATLAB codes. The TLD is tuned with the vortex-shedding frequency of the low-Reynolds number flows, and it is found to be reducing the structural excitation significantly. On the other hand, the high-Reynolds number turbulent flow exhibits a broadband excitation, for which by tuning the TLD with few frequencies obtained through investigations, a good reduction in vibration is observed.