Speaker
Description
In this work, we revisit a unified numerical framework for simulating subsonic aeroacoustic phenomena based on an isentropic formulation of the compressible Navier–Stokes equations. The approach relies on a velocity–pressure setting in which the energy equation is omitted under isentropic assumptions, yielding a system that remains well conditioned in the low-Mach limit while reducing the computational cost compared to fully compressible solvers. Unlike acoustic analogy and hybrid approaches, the proposed method solves the flow and acoustic fields simultaneously within a single model, enabling intrinsic two-way coupling between aerodynamics and acoustics and allowing the simulation of acoustic feedback mechanisms associated with self-sustained oscillations and flow instabilities, such as in subsonic cavity flows.Special attention is devoted to the treatment of boundary conditions, where mean flow and acoustic fluctuations are separated to allow outgoing acoustic waves to leave the computational domain without spurious reflections, even under velocity-prescribed boundaries. The formulation is implemented within a stabilized finite element framework. Numerical examples demonstrate the ability of the method to accurately capture both sound generation and propagation across a wide range of subsonic Mach numbers.