Strong effect of weak diffusion on scalar turbulence at large scales

Details Strong effect of weak diffusion on scalar turbulence at large scales Strong effect of weak diffusion on scalar turbulence at large scales

2007-06-20

arxiv.org/abs/0706.2928v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 1 figure, submitted to Physics of Fluids

Scientific paper

10.1063/1.2793145

Passive scalar turbulence forced steadily is characterized by the velocity correlation scale, $L$, injection scale, $l$, and diffusive scale, $r_d$. The scales are well separated if the diffusivity is small, $r_d\ll l,L$, and one normally says that effects of diffusion are confined to smaller scales, $r\ll r_d$. However, if the velocity is single scale one finds that a weak dependence of the scalar correlations on the molecular diffusivity persists to even larger scales, e.g. $l\gg r\gg r_d$ \cite{95BCKL}. We consider the case of $L\gg l$ and report a counter-intuitive result -- the emergence of a new range of large scales, $L\gg r\gg l^2/r_d$, where the diffusivity shows a strong effect on scalar correlations.

Affiliated with

Also associated with

No associations

Rating

Strong effect of weak diffusion on scalar turbulence at large scales does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Strong effect of weak diffusion on scalar turbulence at large scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong effect of weak diffusion on scalar turbulence at large scales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-34099