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Comment on "Hydrodynamics of fractal continuum flow" and "Map of fluid flow in fractal porous medium into fractal continuum flow"

Li, Jun and Ostoja-Starzewski, Martin (2013) Comment on "Hydrodynamics of fractal continuum flow" and "Map of fluid flow in fractal porous medium into fractal continuum flow". Physical Review E, 88 (5). Art. No. 057001. ISSN 1539-3755. doi:10.1103/PhysRevE.88.057001.

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In two recent papers [Phys. Rev. E 85, 025302(R) (2012) and Phys. Rev. E 85, 056314 (2012)], the authors proposed fractal continuum hydrodynamics and its application to model fluid flows in fractally permeable reservoirs. While in general providing a certain advancement of continuum mechanics modeling of fractal media to fluid flows, some results and statements to previous works need clarification. We first show that the nonlocal character those authors alleged in our paper [Proc. R. Soc. A 465, 2521 (2009)] actually does not exist; instead, all those works are in the same general representation of derivative operators differing by specific forms of the line coefficient c_1. Next, the claimed generalization of the volumetric coefficient c_3 is, in fact, equivalent to previously proposed product measures when considering together the separate decomposition of c_3 on each coordinate. Furthermore, the modified Jacobian proposed in the two commented papers does not relate the volume element between the current and initial configurations, which henceforth leads to a correction of the Reynolds’ transport theorem. Finally, we point out that the asymmetry of the Cauchy stress tensor resulting from the conservation of the angular momentum must not be ignored; this aspect motivates a more complete formulation of fractal continuum models within a micropolar framework.

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Additional Information:© 2013 American Physical Society. Received 23 December 2012; published 21 November 2013. This work was made possible by support from NSF (CMMI-1030940) and Sandia-DTRA (HDTRA1-08-10-BRCWMD).
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Issue or Number:5
Classification Code:PACS: 47.56.+r, 47.53.+n, 47.10.ab
Record Number:CaltechAUTHORS:20131223-090859192
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43134
Deposited By: Tony Diaz
Deposited On:23 Dec 2013 20:33
Last Modified:10 Nov 2021 16:33

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