Abstract
This paper presents direct numerical simulations of various turbulent states and structures in a rotating plane Couette flow. The formations of patterns or roll cells were investigated in a wide range of the rotation number Ω, using a large domain size of 204.8δ × 2δ × 102.4δ. The controlling parameters are Re = Uwδ/ν = 750 and Ω = 2ΩZδ2 /ν, where U w is half the wall velocity difference and Ωz is the spanwise-rotation angular velocity. The simulations reproduced many key features in the experiment of Tsukahara et al. (JFM, 648: 5-33). For stabilizing rotation with Ω ≤ -20, a striped pattern of laminar-turbulent regions was observed. For destabilizing rotation with Ω = 30, turbulent eddies seem to be contained in the three-dimensional roll cells. The wavy motion of the roll cells in the turbulent background reveals a 30δ periodicity in the streamwise direction, and the spacing of the turbulent stripe is of the order of 200δ. A computational domain needs to be large enough compared with these structures induced by the system rotation to ensure reliable quantitative results.
Original language | English |
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Article number | 022024 |
Journal | Journal of Physics: Conference Series |
Volume | 318 |
Issue number | SECTION 2 |
DOIs | |
Publication status | Published - 2011 |
Event | 13th European Turbulence Conference, ETC13 - Warsaw, Poland Duration: 12 Sept 2011 → 15 Sept 2011 |