Numerical assessment of the correction defect induced in a spacetime-corrected acoustic meta-device

What is it about?

The performance decay of acoustic metamaterials in non-quiescent fluids has attracted significant research interest. A promising solution involves reformulating the governing equations into spacetime, using spacetime mappings that precisely tune acoustic metacontinuum parameters and incorporate background flow characteristics into the design. However, when applying coordinate transformation methods, it is crucial to account for their range of validity. In this case, the limitations are tied to the specific flow conditions that the spacetime transformation can capture. This work focuses on assessing the impact of analytical approximations on the performance of a spacetime-corrected acoustic cloaking device. A sensitivity analysis is conducted to reveal how these effects depend on the Mach number intensity and the relative position between the acoustic source and the adapted device.

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Photo by Vadim Bogulov on Unsplash

Photo by Vadim Bogulov on Unsplash

Why is it important?

The research is crucial for understanding the performances and limitations of a spacetime framework for the design of convective acoustic metacontinua. The adapted device sensitivity estimation to the variation of relevant parameters in aeronautics is an aspect that must be considered in engineering applications in this sector where the relative positions of sources, scatterers and the flow are fixed.

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