A Lattice Boltzmann method (LBM) with single-relaxation-time collision model is employed to study incompressible flows passing two rotating cylinders in a side-by-side arrangement. The study was carried out at a various range of absolute rotational speeds for two different gap spacing of 1.5 and 0.5 at Reynolds number of 100 for two possible directions of counter rotation; a doublet-like and the reverse configurations. Quantitative information about the flow variables such as the drag and the lift coefficients and vorticity distributions on the cylinders is highlighted. To validate the simulation, the results are compared to experimental and numerical results that show good agreement in comparison with previously published data. It is found that, for doublet-like rotation, unsteady vortex wakes can be completely suppressed and cause to drag coefficient reduction as K increases. However, for reverse doublet-like, wake pattern is changed in the unsteady regimes according to the rotational speed and cause to drag coefficient change. Also, for both rotating cases, it is observed increases with increasing K.
کلید واژگان :Lattice Boltzmann Method; Multi-distribution functions; Rotating circular cylinders; Vortex shedding; Laminar flow.
ارزش ریالی : 300000 ریال
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