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Fluid deformation in random steady three-dimensional flow

Published online by Cambridge University Press:  19 September 2018

Daniel R. Lester Open the ORCID record for Daniel R. Lester [Opens in a new window] ,
Marco Dentz Open the ORCID record for Marco Dentz [Opens in a new window] ,
Tanguy Le Borgne  and
Felipe P. J. de Barros
Daniel R. Lester*
Affiliation:
School of Engineering, RMIT University, 3000 Melbourne, Australia
Marco Dentz
Affiliation:
Spanish National Research Council (IDAEA-CSIC), 08034 Barcelona, Spain
Tanguy Le Borgne
Affiliation:
Geosciences Rennes, UMR 6118, Université de Rennes 1, CNRS, 35042 Rennes, France
Felipe P. J. de Barros
Affiliation:
Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA
*
†Email address for correspondence: daniel.lester@rmit.edu.au
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Abstract

The deformation of elementary fluid volumes by velocity gradients is a key process for scalar mixing, chemical reactions and biological processes in flows. Whilst fluid deformation in unsteady, turbulent flow has gained much attention over the past half-century, deformation in steady random flows with complex structure – such as flow through heterogeneous porous media – has received significantly less attention. In contrast to turbulent flow, the steady nature of these flows constrains fluid deformation to be anisotropic with respect to the fluid velocity, with significant implications for e.g. longitudinal and transverse mixing and dispersion. In this study we derive an ab initio coupled continuous-time random walk (CTRW) model of fluid deformation in random steady three-dimensional flow that is based upon a streamline coordinate transform which renders the velocity gradient and fluid deformation tensors upper triangular. We apply this coupled CTRW model to several model flows and find that these exhibit a remarkably simple deformation structure in the streamline coordinate frame, facilitating solution of the stochastic deformation tensor components. These results show that the evolution of longitudinal and transverse fluid deformation for chaotic flows is governed by both the Lyapunov exponent and power-law exponent of the velocity probability distribution function at small velocities, whereas algebraic deformation in non-chaotic flows arises from the intermittency of shear events following similar dynamics as that for steady two-dimensional flow.

JFM classification

Mixing: Chaotic advection Low-Reynolds-number flows: Porous media
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 855 , 25 November 2018 , pp. 770 - 803
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Copyright
© 2018 Cambridge University Press 

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