Direct Numerical Simulation of Flow around a Circular Cylinder Controlled Using Plasma Actuators

Taichi Igarashi, Hiroshi Naito and Koji Fukagata

Mathematical Problems in Engineering, 2014, vol. 2014, 1-13

Abstract:

Flow around a circular cylinder controlled using plasma actuators is investigated by means of direct numerical simulation (DNS). The Reynolds number based on the freestream velocity and the cylinder diameter is set at . The plasma actuators are placed at 90° from the front stagnation point. Two types of forcing, that is, two-dimensional forcing and three-dimensional forcing, are examined and the effects of the forcing amplitude and the arrangement of plasma actuators are studied. The simulation results suggest that the two-dimensional forcing is primarily effective in drag reduction. When the forcing amplitude is higher, the mean drag and the lift fluctuations are suppressed more significantly. In contrast, the three-dimensional forcing is found to be quite effective in reduction of the lift fluctuations too. This is mainly due to a desynchronization of vortex shedding. Although the drag reduction rate of the three-dimensional forcing is slightly lower than that of the two-dimensional forcing, considering the power required for the forcing, the three-dimensional forcing is about twice more efficient.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:591807

DOI: 10.1155/2014/591807

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