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• W2783757689 abstract "We study wave packets with the small perturbation/gradient Mach number interacting with a smooth shear-layer in the linear regime of small amplitude perturbations. In particular, we investigate the temporal evolution of wave packets in shear-layers with locally curved regions of variable size using non-modal linear analysis and direct numerical simulations of the two-dimensional gas-dynamical equations. Depending on the wavenumber of the initially imposed wave packet, three different types of behavior are observed: (i) The wave packet passes through the shear-layer and constantly transfers energy back to the mean flow. (ii) It is turned around (or reflected) within the sheared region and extracts energy from the base flow. (iii) It is split into two oppositely propagating packages when reaching the upper boundary of the linearly sheared region. The conducted direct numerical simulations confirm that non-modal linear stability analysis is able to predict the wave packet dynamics, even in the presence of non-linearly sheared regions. In the light of existing studies in this area, we conclude that the sheared regions are responsible for the highly directed propagation of linearly generated acoustic waves when there is a dominating source, as it is the case for jet flows." @default.
• W2783757689 created "2018-01-26" @default.
• W2783757689 creator A5059707003 @default.
• W2783757689 creator A5085183567 @default.
• W2783757689 date "2018-01-01" @default.
• W2783757689 modified "2023-10-02" @default.
• W2783757689 title "Acoustic wave propagation in a temporal evolving shear-layer for low-Mach number perturbations" @default.
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• W2783757689 doi "https://doi.org/10.1063/1.4999044" @default.
• W2783757689 hasPublicationYear "2018" @default.
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