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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v1.i1.40
pages 47-55

Numerical Modeling of Turbulent Flow in Porous Media Using a Spatially Periodic Array

Fujio Kuwahara
Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8561 Japan
Y. Kameyama
Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432, Japan
S. Yamashita
Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432, Japan
Akira Nakayama
Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8561, Japan; School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, Hubei 430023, China

ABSTRACT

Turbulent flowfields within a spatially periodic array were calculated numerically using a finite difference method with a low Reynolds number, two-equation model of turbulence. Exploiting periodic boundary conditions, only a one-structural unit was taken as a calculation domain to simulate a porous medium of regular arrangement in an infinite space. Extensive numerical calculations were carried out for a wide range of Reynolds numbers, to elucidate hydrodynamic behaviors of turbulent flow (post-Forchheimer flow) in porous media. The microscopic numerical results thus obtained at a pore scale were processed to extract the macroscopic hydrodynamic characteristics in terms of the volume-averaged quantities. The macroscopic pressure and flow rate relationship, determined purely from a theoretical basis, has been examined against the existing semiempirical laws, namely, Forchheimer-extended Darcy's law. Thus, departure from Darcy's law resulting from combined nonlinear effects of both porous inertia and turbulence on the macroscopic pressure drop has been investigated numerically and correlated with the porosity and Reynolds number.


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