Multi-component solid and fluid simulation method and system based on SPH (Smoothed Particle Hydrodynamics) method

The invention discloses a multi-component solid and fluid simulation method and system based on a SPH (Smoothed Particle Hydrodynamics) method, can simulate solid and multi-component fluid, the coupling of the solid and the multi-component fluid, porous medium flow and dissolving. The method comprises the following steps: adding the divergence part of the deviatoric stress tensor of the solid into the momentum conservation formula of the multi-component fluid, retaining the part of intensity of pressure, and calculating the integral intensity of pressure of each particle; utilizing a standard multi-component fluid calculation method to update a volume fraction, and calculating the velocity gradient of all components of each particle according to the volume fraction of the solid and the fluid in the space and relative speed; according to the volume fraction, utilizing the constitutive equation of the solid to calculate the deviatoric stress tensor of the solid, and correcting the deviatoric stress tensor according to a yield criterion; utilizing the volume fraction of the solid to correct the deviatoric stress tensor; calculating viscous force among different particles; and according to the deviatoric stress tensor and the viscous force, utilizing the momentum conservation formula to carry out multi-component physical simulation.