NOMENCLATURE c Chord (m)

The objective of the present note is to provide the basic concepts of numerical modelling of cavitation. After a brief description of the cavitation phenomena, the modelling conceps are discussed. A specific attention is given to the development of a barotropic model and its integration in a 3D unsteady CFD code. Influence of numerical and physical parameters is detailed on two two-dimensional configurations (hydrofoil and venturi). Examples of calculations on various geometries (inducers and impellers) are detailed to validate robustness of the computational methodology. Modifications of internal flows due to development of cavitation are discussed and an analysis of the mechanisms leading to the head drop is presented. Simulations of cavitation instabilities in blade cascades are presented and physical mechanisms are discussed