0 a current of water or air running back against the main stream or current. -- olak
1 to move round and round -- berolak
These larger eddies can stir the fluid more efficiently, thereby reducing concentration fluctuations (see figure 4).
The presence of active small-scale turbulence appears responsible for the continuing isotropy of the smallest eddies.
A commonly used procedure to estimate turbulent diffusion times is in terms of enhanced turbulent (eddy) diffusivities.
As soon as t* = 1.5, the velocities become sufficiently high in the wake for a pair of secondary eddies to develop.
In comparing with figure 6, we observe that details of the two spectral eddy-viscosities differ.
However, as the eddy did not increase in size further, this rate decreased downstream of the eddy formation.
For instance, the isotropic eddy viscosity hypothesis does not predict the observed fact that the shear stress and mean velocity gradient vectors have different directions.
In computing the response function, we want to capture the deformation of the fluid eddies while excluding the simple advection due to a large-scale flow.
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