Caustics and Intermittency in Turbulent Suspensions of Heavy Particles

Details Caustics and Intermittency in Turbulent Suspensions of Heavy Particles Caustics and Intermittency in Turbulent Suspensions of Heavy Particles

2009-05-08

arxiv.org/abs/0905.1192v1

Physics

Fluid Dynamics

4 pages, 6 figures

Scientific paper

The statistics of velocity differences between very heavy inertial particles suspended in an incompressible turbulent flow is found to be extremely intermittent. When particles are separated by distances within the viscous subrange, the competition between quiet regular regions and multi-valued caustics leads to a quasi bi-fractal behavior of the particle velocity structure functions, with high-order moments bringing the statistical signature of caustics. Contrastingly, for particles separated by inertial-range distances, the velocity-difference statistics is characterized in terms of a local H\"{o}lder exponent, which is a function of the scale-dependent particle Stokes number only. Results are supported by high-resolution direct numerical simulations. It is argued that these findings might have implications in the early stage of rain droplets formation in warm clouds.

Affiliated with

Also associated with

No associations

Rating

Caustics and Intermittency in Turbulent Suspensions of Heavy Particles 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 Caustics and Intermittency in Turbulent Suspensions of Heavy Particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Caustics and Intermittency in Turbulent Suspensions of Heavy Particles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-703298