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

Taichi Igarashi, Hiroshi Naito, Koji Fukagata

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 languageEnglish
Article number591807
JournalMathematical Problems in Engineering
Volume2014
DOIs
Publication statusPublished - 2014

Fingerprint

Direct numerical simulation
Circular Cylinder
Circular cylinders
Forcing
Actuator
Drag reduction
Actuators
Plasma
Plasmas
Vortex shedding
Drag
Reynolds number
Drag Reduction
Three-dimensional
Direct numerical Simulation
Fluctuations
Desynchronization
Vortex Shedding
Stagnation Point
Arrangement

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)

Cite this

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

In: Mathematical Problems in Engineering, Vol. 2014, 591807, 2014.

Research output: Contribution to journalArticle

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