Abstract
In this paper, a submerged vertical water jet impinging on an air/water free surface is experimentally and numerically investigated. On the one hand, a two dimensions-two components particle image velocimetry technique is carried out to perform velocity measurements from the jet injection to the unsteady free surface. The motion of this interface is recorded by a biaxial shadowgraph imaging system. On the other hand, volume of fluid and large eddy simulation methods are coupled to compute the interaction between the jet dynamics and the interface behavior. Numerical and experimental results are confronted in both the single-phase jet area and the impinging region beneath the free surface. A statistical analysis of the interface motion is led through the maximum elevation point to highlight its organized time and spatial evolution in terms of a characteristic lifetime.
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