A numerical investigation of the behaviour of a 3D cavitation sheet developing along a Venturi geometry has been performed using both a compressible one-fluid RANS solver and a pressure-based solver. The interplay between turbulence and cavitation regarding the unsteadiness and the structure of the flow is complex and not well understood. This constitutes a determinant point to accurately simulate the dynamic of sheet cavities. The mass transfer between phases is driven by a void ratio transport equation model. Turbulence is taken into account using Scale-Adaptive models (SAS). 3D simulations are compared with the experimental data.