Abstract
A numerical method is developed to simulate a bubbly flow around a circular cylinder with a boundary-fitted coordinate system. In this study, the number density model of a bubbly flow is employed, where the equations of conservations and the group motion of bubbles are solved directly, The three-dimensional simulations have been conducted in the laminar flow conditions at the liquid Reynolds number ranging from 100 to 2000. The void fraction profile behind a cylinder agree with that of experiment and another simulation at the liquid Reynolds number of 430. The Strouhal number at the Reynolds number of 200 and 500 is presented. At the lower Reynolds number, the Strouhal number does not change with the variation of the void fraction. On the contrast, the local maximum point of the Strouhal number is observed in the higher Reynolds number case, which is also observed in the experiment. The bubble accumulation in the Karman vortices is observed in the case of the higher relaxation time of a bubble, where such structures have been also observed in the experiment behind a bluff body.
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