Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.9: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

A D3Q19 lattice Boltzmann pore-list code with flow boundary conditions for permeability calculations — •Ariel Narváez, Martin Hecht, and Jens Harting — Institut für Computerphysik, Universität Stuttgart, 70569 Stuttgart

For a broad range of applications the most important transport property of porous media is its permeability, whose definition is related to the Darcy's law.

Here we present a new implementation of the well known D3Q19 lattice-Boltzmann method (single- and multi-relaxation time) using a pore-list instead of the matrix pore-space to characterize the pore structure. The input pore-list data is characterized for the position of the fluid nodes, the connectivity with each other, and also boundary conditions. The flow is driven by using a developed flow boundary conditions at the inlet and at the oulet [1]. This boundary condition acts locally on each lattice site and it is possible to specify the velocity exactly on the boundary nodes. In addition is independent on the details of the relaxation process during collision and contains no artificial slip.

This implementation reduces the computing time required to compute the flow field in steady-state for computational domain with a low porosity.

[1] General on-site velocity boundary conditions for lattice Boltzmann. preprint arXiv: 0811.4593.