Identification of Low-wavenumber Wall Pressure Field beneath a Turbulent Boundary Layer
- Publication Type:
- Thesis
- Issue Date:
- 2025
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The presence of turbulent flow over a structure’s surface forms a turbulent boundary layer (TBL). The wall pressure field (WPF) beneath the TBL can induce structural vibrations. At high Mach numbers, the convective region of the WPF significantly influences these vibrations. However, at low Mach numbers and well above the coincident frequency, the structure filters out most convective components, and vibrations are primarily caused by low-wavenumber components of the WPF. Accurate estimation of the low-wavenumber WPF is essential for predicting flow-induced vibrations.
This thesis numerically investigates two approaches for estimating the low-wavenumber WPF: an acoustic-based approach using a microphone array and a vibration-based approach using an accelerometer array. Key factors in microphone arrangement and limitations of the acoustic method are examined, followed by the proposal of an inverse vibration method for WPF estimation. To assess the effectiveness of these approaches in real-world conditions, a virtual experiment is conducted, involving the synthesis of WPF snapshots.
Additionally, two methods for computing sensitivity functions—the modal expansion method and the reciprocity principle—are explored. Experimental investigations evaluate their effectiveness, showing both methods provide reliable results. These findings improve WPF estimation and enhance the understanding of flow-induced vibrations in structures.
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