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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v21.i5.30
pages 423-439

OPEN-CELL METAL FOAM MESH GENERATION FOR LATTICE BOLTZMANN SIMULATIONS

A. Festuccia
University of Rome Tor Vergata - Department of Mechanical Engineering, Via del Politecnico 1, 00133 Rome (RM)
D. Chiappini
University Niccoló Cusano - Department of Mechanical Engineering, Via don Carlo Gnocchi 3, 00166 Rome (RM)
Gino Bella
University of Rome Tor Vergata - Department of Mechanical Engineering, Via del Politecnico 1, 00133 Rome (RM)

RESUMO

The aim of this work is to compare two different approaches for describing the elementary cell shape of porous media. The first one is based on random spheres packing into the control volume. The second one is based on the Lord Kelvin cell reconstruction (commonly named tetrakaidecahedron). Additionally, we include a random deformation of the starting cell in order to better represent the material properties. The first approach allows reconstructing a perfectly isotropic mesh. It has demonstrated some shortcomings with highly porous media due to the possible formation of isolated solid volumes. This is still acceptable for fluid-dynamics simulations, but not for thermal ones because these zones do not exchange heat with the others due to the lack of connections. The second method is oriented to thermal simulation but the isotropy is not guaranteed anymore due to the intrinsic cell definition. In this work we add a random cell deformation and we propose a sensitivity analysis of material isotropy to deformation magnitude. In fact, the nodes, which represent the single cell connections, are randomly rearranged along the three coordinates according to a uniform distribution of imposed magnitude. The maximum displacement imposed during random deformation represents a degree of freedom which is systematically analyzed in this paper. All the simulations are carried out by means of an optimized and parallel D3Q19 lattice Boltzmann code. After an initial validation by means of experimental results available in the literature, the results are analyzed in terms of pressure drop through a metal foam portion and compared in terms of average and standard deviation values.


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