Chimera method applied to the simulation of a freely falling cylinder in a channel
DOI:
https://doi.org/10.13052/EJCM.19.575-590Keywords:
chimera method, overlapped grid, falling, cylinder, channelAbstract
In this paper, we study the motion of a circular cylinder freely falling in a channel under the action of gravity parallel to the wall. The fixed parameters of the study are the cylinder diameter to channel width ratio, D/d = 3.3, and the fluid to particle density ratio, = 2. The varying parameters are the initial position (in or out of the middle axis) and the Galileo number (151 Ga 300). An automatic chimera method is implemented in a Navier- Stokes solver to simulate this moving confined configuration. The presence of the wall accelerates the oscillations of the motion. The initial position has an influence on the amplification of transverse oscillations. If the cylinder is out of the middle axis, transverse oscillations appear earlier and reach rapidly the amplitude of the terminal periodic oscillations. A relation between the Strouhal and Reynolds numbers is proposed.
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