Fibre-optic sensing for analysis of turbulent pressure fluctuations in partially filled pipes

The authors present experimental data obtained from the turbulence-induced vibration of a fibre-optic sensor structure flush-mounting the interior of a partially-filled pipe rig. Methodology capable of estimating the free stream velocity and spatial correlations of the turbulent pressure fluctuations within the boundary layer is presented. The proposed methodology is validated through application to fibre-optic cable data from multiple flow regimes, as well LES-obtained near-wall pressure fluctuation data for the equivalent flow regimes.