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- W2185177071 abstract "Introduction Three dimensionless parameters determine the structure of steady spherical Couette flow (SCF), flow of viscous incompressible fluid between two concentric spheres, rotating about common axis: Reynolds numbers for inner Rei = Ωir i /ν and outer Reo = Ωor o/ν spheres and relative gap size δ = (ro− ri)/ri. Here ri, ro are the radii and Ωi, Ωo the angular velocities of inner (index i) and outer (index o) spheres, ν is the kinematic viscosity of the fluid in the gap. Steady base flow, returning to its initial state after any perturbations, is symmetric about the axis of rotation and equator plane, and includes differential rotation about the axis and circulation in meridian plane. With Reynolds numbers increasing the base flow loses its stability and after a few bifurcations turbulent state may be formed. In wide gaps flow states, preceding turbulent onset, are non steady and non axisymmetric [1, 2, 3]. For the first time chaos onset was obtained by DNS in axisymmetric formulation [4] in the case of fixed outer sphere. In non-axisymmetric formulation transition to chaos was calculated in the case of constant outer sphere rotational rate and increasing rate of inner sphere rotation [5, 6]. Despite some success in the DNS, question about spatial structure of the flows is still open. In present paper time-averaged spatial structures in weakly turbulent flow states in rotating spherical layer were examined by means of DNS. Connection between these structures and dynamical behavior of turbulent states was investigated experimentally. Following our previous experiments and calculations [3, 5, 6], we study the case of counter rotating spheres in wide gap δ = 1." @default.
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- W2185177071 date "2011-01-01" @default.
- W2185177071 modified "2023-09-28" @default.
- W2185177071 title "Various Turbulent States in Wide Gap Spherical Layer" @default.
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