Discrete element fluid-solid coupling numerical simulation method and system based on GPU matrix

Abstract

The invention discloses a discrete element fluid-solid coupling numerical simulation method and a discrete element fluid-solid coupling numerical simulation system based on a GPU matrix. The discreteelement fluid-solid coupling numerical simulation method comprises the steps of: establishing a pore network model; establishing a fluid unit migration model, wherein fluid units in pores are connected through pore throats among particle units, permeation of the fluid units obeys the Darcy law, the flow of the fluid units is determined by rock and soil mass properties, pore throat diameters and the like, and water pressure, temperature and density have a function relational expression; and exerting fluid-solid coupling effect, wherein pore water pressure acts on the particles, and the particlemovement changes the pore volume, so that a fluid-solid coupling effect is realized. According to the discrete element fluid-solid coupling numerical simulation method, dynamic simulation of a large-scale fluid-solid coupling system can be realized, and the calculation speed and the calculation quantity of discrete element fluid-solid coupling numerical simulation are remarkably improved.

Description

technical field [0001] The invention relates to a particle discrete element simulation, in particular to a fluid-solid coupling numerical simulation of a two-dimensional discrete accumulation body. Background technique [0002] A large number of important engineering problems in geotechnical engineering, geological engineering and energy engineering involve complex fluid-solid coupling processes, such as tunnel water and mud inrush, grouting process, sand base liquefaction, land subsidence, hydraulic fracturing, etc. Since conventional numerical simulation methods such as finite element method or element-free method cannot fully consider the fluid-solid interaction and the gradual change of porosity and seepage caused by the migration and loss of solid particles, it is difficult to truly simulate seepage in the process of fluid-solid coupling. and seepage damage rules. [0003] Discrete elements can solve this kind of problems very well, but there are certain defects in sev...

AI Technical Summary

Problems solved by technology

Since conventional numerical simulation methods such as finite element method or element-free method cannot fully consider the fluid-solid interaction and the gradual change of porosity and seepage caused by the migration and loss of solid particles, it is difficult to truly simulate seepage in the process of fluid-solid coupling. and seepage damage law

[0003] Discrete elements can solve this kind of problems very well, but there are certain defects in several commonly used methods at present, such as DEM-LBM has too much calculation, and it is difficult to carry out large-scale numerical simulation calculations; There are still some deficiencies; DEM-CFD numerical simulation calculations on the pore scale are relatively large

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