Intermittency and structure functions in channel flow turbulence

Details Intermittency and structure functions in channel flow turbulence Intermittency and structure functions in channel flow turbulence

1998-07-20

arxiv.org/abs/chao-dyn/9807027v2

PRL, Vol. 82, No. 25 (1999) 5044-5047

Nonlinear Sciences

Chaotic Dynamics

4 pages, 6 eps figures

Scientific paper

10.1103/PhysRevLett.82.5044

We present a study of intermittency in a turbulent channel flow. Scaling exponents of longitudinal streamwise structure functions, $\zeta_p /\zeta_3$, are used as quantitative indicators of intermittency. We find that, near the center of the channel the values of $\zeta_p /\zeta_3$ up to $p=7$ are consistent with the assumption of homogeneous/isotropic turbulence. Moving towards the boundaries, we observe a growth of intermittency which appears to be related to an intensified presence of ordered vortical structures. In fact, the behaviour along the normal-to-wall direction of suitably normalized scaling exponents shows a remarkable correlation with the local strength of the Reynolds stress and with the \rms value of helicity density fluctuations. We argue that the clear transition in the nature of intermittency appearing in the region close to the wall, is related to a new length scale which becomes the relevant one for scaling in high shear flows.

Affiliated with

Also associated with

No associations

Rating

Intermittency and structure functions in channel flow turbulence 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 Intermittency and structure functions in channel flow turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intermittency and structure functions in channel flow turbulence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-592800