Solid–Liquid Two-Phase Calculation Model and Method

Abstract

As described in Chap. 1 , the computational fluid dynamics (CFD) methods have been used widely in the study of solid–liquid two-phase flow. According to the different modes of solid–liquid two-phase description, the current model methods can be divided into the Two-Fluid Model (TFM), Combined Continuum and Discrete Model (CCDM), and Pseudo Particle Model (PPM). TFM belongs to the Euler-Euler method, both fluid, and solid particles are described by Euler based on the assumption of continuity, and the selected control body scale should be much larger than the single-particle scale, and it needs to be much smaller than the characteristic scale of the system. CCDM belongs to the Euler–Lagrange method, the fluid phase is regarded as a continuous medium, the N-S equation under the Euler coordinate system is solved, the solid phase particles are treated as discrete media, and the equation of motion is tracked and solved under the Lagrange coordinate system. PPM belongs to the Lagrange method, which discretizes fluids into fluid micro-groups. By simulating the interaction between fluid “particles” and solid particles, the classical phenomena and microscopic characteristics in two-phase flow are studied and reproduced. Based on the actual application scenarios, this chapter studies the applicability of two solid–liquid two-phase models (TFM and CCDM) and a particle wall collision rebound model.