Turbulence Transition in the Wake of Wall-Mounted Prisms
Date:
My talk given at the Thirteenth International Symposium on Turbulence and Shear Flow Phenomena (TSFP13) titled “Turbulence Transition in the Wake of Wall-Mounted Prisms”.
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This work presents a numerical investigation of the turbulence transition phenomenon in the wake of wall-mounted prisms. Large-eddy simulations are performed at Re = $1\times 10^3 - 5\times 10^3$ for prisms at a range of aspect-ratio ($0.25-1.5$) and depth-ratios ($1-5$). The results show that the wake unsteadiness is enhanced with increasing depth-ratio, which is attributed to the interactions between Kelvin-Helmholtz instability of the shear-layer and large-scale vortex shedding. This is driven by the shear-layer flapping motion in the large depth-ratio prism. These interactions elevate the flow momentum due to increased turbulence intensity and mixing, contributing to the wake transition phenomenon. Enhanced interactions are quantified using the Poisson’s equation and bi-spectral mode decomposition. This study underscores the role of depth-ratio in the transition phenomenon.
Conference Publication: