  Sheet cavitation appears in many hydraulic applicationss and can lead to
technical issues. Some fundamental outcomes such as the complex topology of
3-Dimensional cavitation pockets and their associated dynamics need to be
carefully visited.In the present paper, the dynamics of partial cavitation
developing in a 3-D Venturi geometry and the interaction with sidewalls are
numerically investigated. The simulations are performed usinf a one-fluid
compressible Reynolds-Averaged Navier-Stokes (RANS solver associated to a
non-linear turbulence model and a void transport-equation model. A detailed
analysis of this cavitating flow is carried out using innovative tools such as
Spectral Proper Orthogonal Decompositions. Particular attenttion is paid in the
study of 3-D effects by comparing numerical results obtained with sidewalls and
periodic conditions. A three-dimensional dynamics of the sheet cavitation,
unrelated to the presence of sidewalls, is identified and discussed.
