Abstract
Numerical simulations of cavitating flows are frequently performed by applying simple law of state-models. In this study an advanced law of state-model on the basis of a Landau-type approach is used that focusses on the physical treatment of relaxation phenomena. Relaxation phenomena or phase non-equilibrium effects occur within the scope of two-phase fluid dynamics if the time scale of the flow problem is small. This appears e.g. in the case of cavitating flow in injector nozzles of diesel engines. The aim of this study is the determination of the relaxation parameter of the advanced law of state-model. For this reason a theoretical approach is presented as well as simulations of unsteady cavitating nozzle flows that are compared with experimental data. Concerning the calculation of 2-D unsteady cavitating flow the evolution equation for the vapor fraction is solved by a modified Volume-of-Fluid algorithm.
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