Anisotropy of acceleration in turbulent flows.
Third-order Lagrangian stochastic models for the evolution of fluid-particle hyperaccelerations (material derivatives of Lagrangian accelerations) are shown to account naturally for the anisotropy of acceleration variances in low-Reynolds-number turbulent flows and for their dependency upon the energy-containing scales of motion. Model predictions are shown to be in close accord with the results of direct numerical simulations for a turbulent channel flow and with previously acquired simulation data for a homogeneous turbulent shear flow.
Silsoe Research Institute, Wrest Park, Silsoe, Bedford, MK45 4HS, United Kingdom. andy.reynolds@bbsrc.ac.uk
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Reynolds
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Yeo
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Lee