منابع مشابه
Stirring and mixing of biologically reactive tracers
We examine the effect of stirring and mixing on the marine planktonic ecosystem. We present a number of models investigating the impact of patchiness in the population, diffusion, and fluid stirring on the spatial structure of the population and the overall production rates of the system. It is found that the heterogeneity of the system significantly affects the way the system behaves. The resp...
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The parameterization of unresolved processes in oceanographic models is complicated by the interplay of processes on a wide variety of space and time scales. The lack of spectral gaps further complicates the situation, though perhaps not as seriously as might be feared. Understanding the interaction of different processes, and determining which one is critical, or rate-controlling, may be aided...
متن کاملStirring and Mixing in Two-Dimensional Divergent Flow
While stirring and mixing properties in the stratosphere are reasonably well understood in the context of balanced (slow) dynamics, as is evidenced in numerous studies of chaotic advection, the strongly enhanced presence of high-frequency gravity waves in the mesosphere gives rise to a significant unbalanced (fast) component to the flow. The present investigation analyses result from two ideali...
متن کاملMeeting report: From stirring to mixing in a stratified ocean
Over fifty years ago, Carl Eckart described the sequence of processes as a passive scalar is stirred and mixed in a turbulent flow (Eckart, 1948). At first, during the stirring phase, the variance of the scalar gradient is greatly increased, but later, during the mixing phase, the gradients become sufficiently sharp that molecular diffusion becomes important and the gradient variance rapidly de...
متن کاملEffects of mixing and stirring on the critical behaviour
Stochastic dynamics of a nonconserved scalar order parameter near its critical point, subject to random stirring and mixing, is studied using the field theoretic renormalization group. The stirring and mixing are modelled by a random external Gaussian noise with the correlation function ∝ δ(t − t)k and the divergence-free (due to incompressibility) velocity field, governed by the stochastic Nav...
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ژورنال
عنوان ژورنال: Annual Review of Fluid Mechanics
سال: 2019
ISSN: 0066-4189,1545-4479
DOI: 10.1146/annurev-fluid-010518-040306