A Simplified Lattice Boltzmann Boundary Conditions for Gas Transport in Self-Affine Microchannels with an Inherent Roughness of in a Tight Reservoir

A simplified method of determining lattice Boltzmann boundary conditions based on self-affine microchannels with an inherent roughness in a tight reservoir is presented this paper to address nonlinear efficiency problems fluid simulation. This approach effectively combines the influence rough surfaces simulation flow field, description L-fractal theory applied surfaces, and generalized equivalent composite slip for roughness. The numerical simulations gas slippage two-dimensional plate model induce vortex reflux are also successfully carried out, results good agreement results, which establishes reliability flexibility proposed surfaces. effects relative average height fractal dimensions under exact coarsened ones investigated from three perspectives, namely those velocity, velocity at position outlet, coefficient variation position. It was found that effect behavior more obvious when it associated enhanced rarefaction effect. In addition, area seepage reduced, resistance increased. When dimension wall about 1.20, has greatest impact law. excessive surface tends lead backflow region adjacent wall, greatly reduces its velocity. For nanoscale space, hindered migration rate by 84.7%. pores larger than 200 nm, generally negligible.