Ricerc@Sapienza

Direct numerical simulations (DNS) are carried out to study turbulence dynamics in the separation bubble in lower curved wall channels. Boundary layer separation consists of fluid flow around bodies becoming detached, which causes the fluid closest to the object’s surface to flow in reverse or different directions, most often giving rise to turbulent flow. The study of turbulence and boundary layer separation has long

The energy transfer among the different scales of the turbulent structures is analysed by means of the generalised Kolmogorov equation (GKE). The equation is applied to a turbulent channel with the addition of a bump which creates a strong shear layer and separation bubble. The GKE can provide an intricate description of the energy scale-by-scale budget in both physical and separation space, through the identification of the regions of production and dissipation of energy. Conventional one-point statistics do not allow any analysis across scales.