November 2015
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54 Reads
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4 Citations
The external air low speed flow over a flat plate passed a half cylinder shape is computed using an unsteady CFD technique; the turbulent surface pressure field is analyzed in details; a frequency-wavenumber decomposition is used to identify the convective and acoustic energy concentration. A comparison is then made with results obtained using several standard semi-analytical models of turbulent surface pressure. Finally the wall pressure fluctuations are used as a load on an elastic plate in a vibroacoustic analysis and the transmitted noise inside a trimmed acoustic cavity is computed. Some conclusions are drawn on the pertinence of using a semi-analytical model or unsteady LES-type CFD computations to describe the wall pressure loading for a vibroacoustic analysis.