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Problem of cavitation is the undesirable phenomena occuring in the fluid flow in many hydraulic application (pumps, turbines, valves, etc.). Therefore this is in the focus of interest using experimental and mathematical methods. MATHEMATICAL MODELLiquid can be exposed to pressure decreasing by constant temperature condition. The pressure may drop below the saturated vapour pressure, then the liquid column rupture is detected and the process is called cavitation. The liquid contains micro bubbles of non-condensable gas (dissolved), which under decreasing pressure may grow.Mathematical model is defined for multiphase mixture consisted from water and vapour eventually air. For multiphase flow simulation the Mixture model is used. This model is advisable, when the velocity of individual phase translation differs. Model provides phase changeover, for this occasion the volumetric fractions of phases are defined. * prof. RNDr.