The relaxation oscillation of turbulent convection in rotating cylindrical annulus
AbstractIn the last decades two-dimensional turbulence developing in strongly anisotropic systems such asmagnetic confinement devices and fast rotating geophysical uids has been the subject of great con-cern because of their complex transport phenomena, and the main features are the bursts in thefluctuation level and relaxation oscillations in the kinetic energy1￠3. The mechanism underlyingrelaxation-oscillation generation and stability in turbulent convection driven by centrifugal buoyancyis studied in this paper. At high Rayleigh number, the vacillating unstable mode subdues to a newsecondary vacillation instability, whose standing-wave type oscillation in the azimuthal direction leadsto the large-scale intermittency, the chaotic relaxation oscillation. It is illustrated that the relaxationoscillation can only be triggered when the dominant wave number lies in a narrow range due to thestrong shear stress exerted by the no-slip boundary, and the Coriolis effect on its generation is alsodiscussed.
J.Tao
LTCS and Department of Mechanics and Aerospace Engineering, Peking University, Beijing 1000871,China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）