On properties of fluid turbulence along streamlines

Geometrical and dynamical properties of turbulent flows have been investigated by streamline segment analysis. Starting from each grid point, a streamline segment is defined as the part of its streamline bounded by the two adjacent extremal points of the velocity magnitude. Physically the streamline...

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Bibliographic Details
Published in:Journal of fluid mechanics 2010-04, Vol.648, p.183-203
Main Author: WANG, LIPO
Format: Article
Language:English
Subjects:
Energy dissipation
Exact sciences and technology
Flow velocity
Fluid dynamics
Fluid mechanics
Fundamental areas of phenomenology (including applications)
Kinetic energy
Kinetics
Physics
Turbulence simulation and modeling
Turbulent flow
Turbulent flows, convection, and heat transfer
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Summary:Geometrical and dynamical properties of turbulent flows have been investigated by streamline segment analysis. Starting from each grid point, a streamline segment is defined as the part of its streamline bounded by the two adjacent extremal points of the velocity magnitude. Physically the streamline segments can be extended into a more meaningful concept, namely the streamtube segments, which are non-overlapping and space filling. This decomposition of the flow allows for new insights into vector-related statistics in turbulence. According to the variation of velocity, the streamline segments can be sorted into positive and negative segments. The overall properties of turbulent flows can be newly understood and explained from the statistics of these segments with simple structures; for instance, the negative skewness of the velocity derivative becomes naturally a kinematic outcome. Furthermore, from direct numerical simulations conditional statistics of pressure and kinetic energy dissipation along the streamline segments are evaluated and discussed.
ISSN:0022-1120
1469-7645
DOI:10.1017/S0022112009993041