Numerical analysis of flow characteristics around a rigid thin plate
To further investigate the influence of Reynolds number and inlet shear parameter on the evolution of vor-tex street in the wake and resistance characteristics of a flat plate,a model based on the immersed boundary-lattice Boltzmann method is built to numerically simulate the flow around a rigid thin plate.The Reynolds number and in-let shear parameter were considered as controls.All simulations on the flow around flat plates were performed in the range of 100≤Re≤1 200.The variation of two instability transition positions in the wake of plates and the drag ex-erted on the rigid plates with the shear parameter of the incoming flow,as well as their dependence on the Reynolds number,are extensively analyzed.The mechanisms are also discussed in detail.The results indicate that,after several quasi-periodic bifurcations,the wake flow transitions into the chaotic state with an increase in the shear pa-rameter,characterized by large-scale vortex structures.The chaotic state of the wake flow further induces low-fre-quency chaotic drag force on the plates.Moreover,a small critical shear parameter is required for the transition to chaotic flow loads with high Reynolds numbers.
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