Print Email Facebook Twitter A study on the application of two different acoustic analogies to experimental PIV data Title A study on the application of two different acoustic analogies to experimental PIV data Author Koschatzky, V. Westerweel, J. Boersma, B.J. Faculty Mechanical, Maritime and Materials Engineering Department Process and Energy Date 2011-06-30 Abstract The aim of the present study is to compare two different acoustic analogies applied to time-resolved particle image velocimetry (PIV) data for the prediction of the acoustic far-field generated by the flow over a rectangular cavity. We consider the model problem of sound radiating from an open, two-dimensional, shallow cavity with an aspect ratio of 2 at a Reynolds number of 3.0?×?104 (based on the cavity length). The study is carried out by simultaneous high-speed two-dimensional PIV and sound measurements. The instantaneous flow field is obtained from the PIV measurements. The emitted sound is then calculated using Curle’s analogy and Vortex Sound Theory. To our knowledge, Vortex Sound Theory is used here for the first time in combination with time-resolved PIV data. The acoustic analogies are derived through rather different pathways, and the mathematical schemes used to solve the equations are sensitive in a different way to factors such as data resolution, noise level, and complexity of the geometry. Both methods indicate that the trailing edge of the cavity is the main sound source. The predictions of the acoustic field obtained by applying the two methods are analyzed and compared with the measured sound. For the presented case, the results show that both analogies estimate the overall sound pressure level quite well and that they give very similar results, both in total intensity and in the spectral distribution of the emitted sound. Subject acoustic emissionacoustic fieldacoustic intensityacoustic measurementacoustic noiseaeroacousticsboundary layersconfined flowexternal flowsflow visualisationlaminar flowvortices To reference this document use: http://resolver.tudelft.nl/uuid:9fd7c4dc-50f6-4b41-a9a8-3a6a131f20f8 DOI https://doi.org/10.1063/1.3596730 Publisher American Institute of Physics ISSN 1070-6631 Source http://link.aip.org/link/doi/10.1063/1.3596730 Source Physics of Fluids, 23 (6), 2011 Part of collection Institutional Repository Document type journal article Rights © 2011 The Author(s)American Institute of Physics Files PDF Koschatzky_2011.pdf 3.15 MB PDF PhysFluids_23_109902[1].pdf 21.62 KB Close viewer /islandora/object/uuid:9fd7c4dc-50f6-4b41-a9a8-3a6a131f20f8/datastream/OBJ1/view