Flow over two tandem cylinders is simulated using an immersed-boundary method. Cases with different distances between the cylinders are investigated. The flow field is then used to provide information to analyze the pressure fluctuations both in the cylinders (assumed rigid and hollow) and at the far field. The results show that the downstream cylinder pertains higher levels of pressure fluctuations both inside the cylinder and at far field than the upstream cylinder. When the distance between the cylinders increases from the quasi-reattachment flow pattern to the critical regime, the pressure fluctuation levels from the downstream cylinder increase significantly. The spectral analysis reveals only one significant peak at the frequency of twice of the corresponding Strouhal number for the far-field acoustics, but two peaks at the frequencies of both the Strouhal number itself and twice of it for pressure fluctuations inside the cylinders.
Volume Subject Area:
Noise Control and Acoustics
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