Abstract
The turbulent wake dynamics of a wall-mounted low-aspect ratio square-based pyramid protruding a nominally thin turbulent boundary layer are investigated for a moderate Reynolds number of 28000. The three-component velocity data are measured using planar stereoscopic Particle Image Velocimetry (PIV), from which the coherent global velocity field dynamics are reconstructed using a surface-pressure sensor-based estimation. An estimation technique is implemented which improves on classical EPOD by accounting for phase delay information between the sensor and velocity data. It is shown that the energy exchange between a slow-varying global and harmonic shedding modes characterise the coherent wake dynamics.
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© 2016 Springer International Publishing Switzerland
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Hosseini, Z., Martinuzzi, R.J. (2016). Three-Dimensional Instabilities in the Wake of a Wall-Mounted Low-Aspect-Ratio Pyramid. In: Peinke, J., Kampers, G., Oberlack, M., Wacławczyk, M., Talamelli, A. (eds) Progress in Turbulence VI. Springer Proceedings in Physics, vol 165. Springer, Cham. https://doi.org/10.1007/978-3-319-29130-7_44
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DOI: https://doi.org/10.1007/978-3-319-29130-7_44
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