Developments of the time-domain impedance boundary condition for combustion problems
Résumé
Thermoacoustic instabilities can cause significant pressure oscillations and potentially lead to the failure of combustion systems. These instabilities result from the interaction between heat release fluctuations and acoustic waves. One potential solution to mitigate thermoacoustic instabilities is to use passive acoustic damping devices, referred to as liners. These liners absorb acoustic waves and aim to break the instability loop. To represent such materials in time domain solvers, a complex impedance convolution problem must be solved. In this work, we describe a recently implemented time-domain impedance boundary condition, with extended capabilities that make it a promising candidate for combustion solvers.
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