0 Shock wave – turbulence interaction in accretion disks . Non – relativistic case Luigi Foschini

Despite of a lot of efforts and interesting results, accretion disk theory is still under development and there are several unknowns: specifically, all available models are in the steady state approximation. In this letter, we investigate unsteady motion, beginning with shock wave–turbulence interaction. Indeed, unsteady flow allows this type of interaction, which in turn results in substantial changes in the accretion disk structure, enlarging the region where it is possible that the plasma reaches the thermal temperature. Shock wave–turbulence interaction can also explain the supersonic motion in the boundary layer, without violating causality and introducing particular assumptions on the viscosity. keywords: accretion, accretion disks – shock waves – turbulence – novae, cataclysmic variables