Evolution Mechanism of Fluid Flow Regimes under the Dual Constraints of Fracture Geometric Roughness and Aperture Heterogeneity
DOI:
https://doi.org/10.54097/1a0mrd64Keywords:
Nonlinear flow, surface roughness, lattice Boltzmann numerical simulation method, Forchheimer equationAbstract
This study investigates the nonlinear flow behavior in rough fractures under the combined influence of surface roughness and aperture heterogeneity using the lattice Boltzmann numerical simulation method. Surface roughness is decomposed into the local roughness effect, hydraulic tortuosity effect, and surface tortuosity effect. In addition, an aperture roughness effect induced by aperture heterogeneity is introduced. From a mechanistic perspective, the influences of these four effects on fluid flow characteristics within fractures are systematically analyzed. The results show that the Forchheimer equation can adequately describe nonlinear fluid flow in rough fractures, and its nonlinear coefficient can be determined by quantitatively characterizing fracture geometry. Based on the fourfold effects of fracture seepage, the fracture geometric structure is quantitatively described, and the transition mechanism between linear and nonlinear flow under the influence of rough fracture geometry is clarified.
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