Evidence for a mixing transition in fully-developed pipe flow. Beverley McKeon, Jonathan Morrison DEPT AERONAUTICS IMPERIAL COLLEGE. Summary. Dimotakis’ “mixing transition” Mixing transition in wall-bounded flows Relationship to the inertial subrange
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Beverley McKeon, Jonathan Morrison
From Coles (1962)
In overlap region, dissipation
y+ = 100 - 200 i.e. traditionally accepted log law region
Perry and Li, J. Fluid Mech. (1990). Fig. 1b
y/R = 0.38
y/R = 0.10
ReD < 100 x 103
ZS outer scale gives better collapse in core region for all Reynolds numbers
100 x 103 < ReD < 200 x 103
ReD > 200 x 103
Addition of inner and outer log laws shows that U flowCL+ scales logarithmically in R+
Integration of log law from wall to centerline shows that U+ also scales logarithmically in R+
Thus for log law to hold, the difference between them, x, must be a constant
True for ReD > 300 x 103Self-similarity of mean velocity profile requires x = const.
k = 0.421
k = 0.385?
y = U+ - 1/k ln y+