Control of the vorticity mode in the linearized Euler equations for hybrid aeroacoustic prediction

The issue of vorticity mode perturbation in Linearized Euler Equations (LEE) is addressed in this paper. We chose to tackle this question by the point of view of source term formulation. It is numerically shown that the use of a rotational free acoustic source term significantly reduces the development of the hydrodynamic mode. In accordance with the theory, the proposed source term lead to a quasi total absence of vorticity mode in a spatially uniform mean flow, and a strong reduction in a sheared mean flow.