Universal behaviour of entrainment due to coherent structures in turbulent shear flow

Details Universal behaviour of entrainment due to coherent structures in turbulent shear flow Universal behaviour of entrainment due to coherent structures in turbulent shear flow

2002-02-27

arxiv.org/abs/nlin/0202061v2

Nonlinear Sciences

Chaotic Dynamics

Preprint replaced in order to add the following comment: accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.134503

I suggest a solution to a persistent mystery in the physics of turbulent shear flows: cumulus clouds rise to towering heights, practically without entraining the ambient medium, while apparently similar turbulent jets in general lose their identity within a small distance through entrainment and mixing. From dynamical systems computations on a model chaotic vortical flow, I show that entrainment and mixing due to coherent structures depend sensitively on the relative speeds of different portions of the flow. A small change in these speeds, effected for example by heating, drastically alters the sizes of the KAM tori and the chaotic mixing region. The entrainment rate and, hence, the lifetime of a turbulent shear flow, shows a universal, non-monotone dependence on the heating.

Affiliated with

Also associated with

No associations

Rating

Universal behaviour of entrainment due to coherent structures in turbulent shear flow 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 Universal behaviour of entrainment due to coherent structures in turbulent shear flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal behaviour of entrainment due to coherent structures in turbulent shear flow will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-52193