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Three-dimensional direct numerical simulation of wake transitions of a circular cylinder

  • Hongyi Jiang (a1), Liang Cheng (a1) (a2), Scott Draper (a1) (a3), Hongwei An (a1) and Feifei Tong (a1)...

Abstract

This paper presents three-dimensional (3D) direct numerical simulations (DNS) of flow past a circular cylinder over a range of Reynolds number ( $Re$ ) up to 300. The gradual wake transition process from mode A* (i.e. mode A with large-scale vortex dislocations) to mode B is well captured over a range of $Re$ from 230 to 260. The mode swapping process is investigated in detail with the aid of numerical flow visualization. It is found that the mode B structures in the transition process are developed based on the streamwise vortices of mode A or A* which destabilize the braid shear layer region. For each case within the transition range, the transient mode swapping process consists of dislocation and non-dislocation cycles. With the increase of $Re$ , it becomes more difficult to trigger dislocations from the pure mode A structure and form a dislocation cycle, and each dislocation stage becomes shorter in duration, resulting in a continuous decrease in the probability of occurrence of mode A* and a continuous increase in the probability of occurrence of mode B. The occurrence of mode A* results in a relatively strong flow three-dimensionality. A critical condition is confirmed at approximately $Re=265{-}270$ , where the weakest flow three-dimensionality is observed, marking a transition from the disappearance of mode A* to the emergence of increasingly disordered mode B structures.

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Email address for correspondence: hongyijiang88@gmail.com

References

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Three-dimensional direct numerical simulation of wake transitions of a circular cylinder

  • Hongyi Jiang (a1), Liang Cheng (a1) (a2), Scott Draper (a1) (a3), Hongwei An (a1) and Feifei Tong (a1)...

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