Method for predicting multiphase flow through adoption of mixed scale multiphase flow model

Abstract

The invention provides a method for predicting multiphase flow through adoption of a mixed scale multiphase flow model. The method comprises the steps of S1, determining a phase interface of a large scale and the phase interface of a small scale in mixed scale multiphase flow according to a preset computing domain mesh size; S2, obtaining a physical property parameter of each medium in the mixed scale multiphase flow, an interface parameter composed of adjacent media, and a physical parameter of discrete particles; S3, predicting the mixed scale multiphase flow through adoption of the pre-established mixed scale multiphase flow model according to the physical property parameter, the interface parameter and the physical parameter, determining a physical process of the mixed scale multiphase flow, and obtaining flow field information, wherein the mixed scale multiphase flow model comprises a continuous interface capturing algorithm with a collection of phase fractions occupied by the discrete particles, a satellite algorithm of the discrete particles, and an interaction sub-model of the interface of the continuous flow and the discrete particles. According to the method, it is ensured that an interface is not diverged and physical attributes on the interface are in step distribution as much as possible.

Description

technical field [0001] The multiphase flow prediction technology involved in the present invention, in particular, relates to a method for predicting multiphase flow by using a mixed-scale multiphase flow model. Background technique [0002] Multiscale multiphase flow processes widely exist in various industrial processes, such as energy and power, petrochemical, metallurgy, refrigeration, and aerospace. Usually, a multiphase flow system is always composed of several continuous media and several discontinuous media. A continuous medium can be called a continuous phase, while a discontinuous medium is called a discrete phase. Multiphase flow refers to the flow process composed of different kinds of continuous media or discontinuous media. In nature, daily life and various industrial processes, two-phase or multiphase flow problems exist widely, such as gas-liquid, liquid-liquid, gas-solid and liquid-solid multiphase flow systems. Among them, gas-liquid, gas-solid or gas-li...

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Problems solved by technology

(2) It is difficult to describe the phase distribution

(3) It is difficult to determine the interaction between phases

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