Modelling waves in solar-like interiors with the MUSIC code

The importance of waves propagating in the stars is twofold. First, they offer a great opportunity to unveil stellar internal structure and dynamics thanks to the observation of oscillations modes of stars, this is the field of asteroseismology. Secondly, they have an impact on the internal structure and evolution of stars as they can transport angular momentum, energy and chemical elements between different region of the star. In this presentation I would like to particularly focus on internal gravity waves (IGW). Observation of these waves remain challenging and their properties in stellar interiors remain poorly constrained. These properties of IGW are inherently 3D, non-linear and anisotropic. Consequently, multi-dimensional simulations are needed in order to test theoretical models and guide observations! This is essential for past, present and future missions such as Kepler, TESS or PLATO. In this talk, I will present a study of IGW in solar-like stars based on multi-dimensional stellar structure models preformed with a fully compressible hydrodynamics time implicit code, the MUSIC code. I will discuss how an artificial increase of the stellar luminosity and of the thermal diffusivity by several orders of magnitudes impact the waves properties. Our results suggest that this technique affect the excitation of IGW, because of an impact on convective motions and overshooting, but also their damping. This is of particular importance when studying mixing and stellar rotation