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Abstract. In this study the change of free surface vortex is expressed through the time volume fractionusing multiphase unsteady condition in sump, because in previous studies of the pump sump did not rep-resent the behavior of the free surface vortex exactly due to the reason it was calculated using single phaseand steady condition. The reliability of the computational analysis is verified through comparing exper-imental results with that of present numerical analysis. Homogeneous free surface model is used to applyinteractions of air and water. The results show that the free surface vortex can be identified on the iso-tropic surface at air volume fraction 1%~5%. The vortices make an air column from the free surface tothe sump intake and are created and destroyed repeatedly. The behavior of free surface vortex at numericalanalysis is quite similar to experimental test. The result of vortex motion according to time, works ona cycle.Key Words:Free Surface Vortex ( ), Homogeneous Model ( ), Multi-phaseFlow (), Volume Fraction (), Unsteady Condition ( )

Visualization of Air Absorption Induced by Free Surface Vortex in the Pump Sump Using Multi-phase Flow Simulation