Abstract

The present study focuses on the control of an unsteady vortex flow regime and flow-induced forces on the tandem circular cylinder using the splitter plate-based technique at a Reynolds number (Re) of 100. The in-house developed flexible forcing immersed boundary lattice Boltzmann method (FFIBLBM) solver is employed for these two-dimensional numerical simulations. Three distinct tandem cylinder spacing is considered: small spacing (G/D = 2.0), medium spacing (G/D = 3.5), and large spacing (G/D = 5.0), where G is the center-to-center distance between the cylinders having diameter D. For each spacing, the effectiveness of two different configurations of splitter plates are examined: splitter plate attached to the upstream cylinder (TC-SPU) only and splitter plate attached to the downstream cylinder (TC-SPD) only. The arrangement and length of the splitter plate have a significant effect on the suppression of vortex shedding and reduction of flow-induced force on the cylinders. The result shows that the TC-SPD is beneficial for small spacing, yielding a drag reduction of 0.58 % and 0.05 % for the upstream and downstream cylinders. At the same time, both the TC-SPU and TC-SPD configurations are useful for suppressing the flow unsteadiness for medium spacing. However, the drag reduction in TC-SPD is more. In this case, the drag of the upstream and downstream cylinders is reduced by 1.4 % and 247 %, respectively. At large spacing, the TC-SPU arrangement is suitable for the suppression of vortex shedding from both cylinders. The corresponding drag reduction for the upstream and downstream cylinders is 13.7 % and 89.2 %, respectively.

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