||Computational Fluid Dynamics CFD is a type of software using a numerical modelling (finite element methods and finite volume methods) based on Navier-Stokes equations. This approach allows determining distributions of pressure, velocity, temperature and other features of a flowing media. In the present work. CFD software was used to a development of three-dimensional model of a cavitation tunnel, used for an examination of cavitation resistance of structural materials, as well as to simulate a liquid flow through the tunnel. The simulation was carried out for various assumed flow rates, to determine an optimal value leading to a more extensive area of low pressure assisted by a cavitation phenomenon.