Extracting Noise Producing Coherent Structures in Cylinder Flows from TR PIV Data
Abstract
For a subcritical flow around a circular cylinder with a turbulent wake, Time resolved Particle image velocimetry (TR PIV) experiments have been performed to study and extract the large scale flow structures that lead to far-field noise. This has been done by decomposing the flow velocity fluctuation fields into their frequency and spanwise wavenumber modes and a low-order system has been found which can be used to develop noise prediction models. Then by using the far-field acoustic measurements, which were synchronised with the TR PIV, acoustic contribution of individual spanwise wavenumber mode is evaluated at the tonal frequency. Also, the global features of the flow have been characterized by presenting the time-averaged mean flow velocities and turbulent statistics.
Domains
Engineering Sciences [physics]
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Circular Cylinder TR PIV data analysis 17May2022.pdf (5.37 Mo)
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