Flow structure and torque transition process of turbulent Taylor-Couette flow

Abstract eng:
g Direct numerical simulations of Taylor-Couette flow form Re : 8000 to 25000 are carried out to investigate the process of the transition in the Reynolds number dependency of the mean torque. The velocity fluctuations are decomposed into the contributions of the Taylor vortices and remaining turbulent fluctuations. Distinct Reynolds number dependencies of these components are observed in the Reynolds shear stress and the torque transmission. The net contributions of these components to the mean torque are evaluated. Relative contributions of The Taylor vortex component is overtaken by the turbulent counterpart around Re : 15000. This Reynolds number is close to the torque transition Reynolds number in the literature. These results suggest that the torque transition can be explained by the competition between the contributions of azimuthally averaged Taylor vortex and the remaining turbulent components.

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