Nanoflows through disordered media: a joint Lattice Boltzmann and Molecular Dynamics investigation

Details Nanoflows through disordered media: a joint Lattice Boltzmann and Molecular Dynamics investigation Nanoflows through disordered media: a joint Lattice Boltzmann and Molecular Dynamics investigation

2009-07-03

arxiv.org/abs/0907.0663v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We investigate nanoflows through dilute disordered media by means of joint lattice Boltzmann (LB) and molecular dynamics (MD) simulations -- when the size of the obstacles is comparable to the size of the flowing particles -- for randomly located spheres and for a correlated particle-gel. In both cases at sufficiently low solid fraction, $\Phi<0.01$, LB and MD provide similar values of the permeability. However, for $\Phi > 0.01$, MD shows that molecular size effects lead to a decrease of the permeability, as compared to the Navier-Stokes predictions. For gels, the simulations highlights a surplus of permeability, which can be accommodated within a rescaling of the effective radius of the gel monomers.

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