### 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 R e D = 1000. 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.

Original language | English |
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Article number | 591807 |

Journal | Mathematical Problems in Engineering |

Volume | 2014 |

DOIs | |

Publication status | Published - 2014 |

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### ASJC Scopus subject areas

- Mathematics(all)
- Engineering(all)

### Cite this

*Mathematical Problems in Engineering*,

*2014*, [591807]. https://doi.org/10.1155/2014/591807

**Direct numerical simulation of flow around a circular cylinder controlled using plasma actuators.** / Igarashi, Taichi; Naito, Hiroshi; Fukagata, Koji.

Research output: Contribution to journal › Article

*Mathematical Problems in Engineering*, vol. 2014, 591807. https://doi.org/10.1155/2014/591807

}

TY - JOUR

T1 - Direct numerical simulation of flow around a circular cylinder controlled using plasma actuators

AU - Igarashi, Taichi

AU - Naito, Hiroshi

AU - Fukagata, Koji

PY - 2014

Y1 - 2014

N2 - 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 R e D = 1000. 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.

AB - 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 R e D = 1000. 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.

UR - http://www.scopus.com/inward/record.url?scp=84904120138&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84904120138&partnerID=8YFLogxK

U2 - 10.1155/2014/591807

DO - 10.1155/2014/591807

M3 - Article

VL - 2014

JO - Mathematical Problems in Engineering

JF - Mathematical Problems in Engineering

SN - 1024-123X

M1 - 591807

ER -