Journal
JOURNAL OF FLUID MECHANICS
Volume 744, Issue -, Pages 5-37Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2014.41
Keywords
turbulent flows; turbulence theory
Categories
Funding
- Fundacao para a Ciencia e a Tecnologia [SFRH/BD/61223/2009]
- POPH/FSE
- Fundação para a Ciência e a Tecnologia [SFRH/BD/61223/2009] Funding Source: FCT
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The previously reported non-equilibrium dissipation law is investigated in turbulent flows generated by various regular and fractal square grids. The flows are documented in terms of various turbulent profiles which reveal their differences. In spite of significant inhomogeneity and anisotropy differences, the new non-equilibrium dissipation law is observed in all of these flows. Various transverse and longitudinal integral scales are measured and used to define the dissipation coefficient C-delta. It is found that the new non- equilibrium dissipation law is not an artefact of a particular choice of the integral scale and that the usual equilibrium dissipation law can actually coexist with the non-equilibrium law in different regions of the same flow.
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