Semi-analytical calculation method for bidirectional coupling of hyper-ellipsoidal particles and flow field

Abstract

The invention discloses a hyper-ellipsoidal particle and flow field bidirectional coupling semi-analytical calculation method, and aims to provide an analytical method for improving the applicabilityof a hyper-ellipsoidal particle and flow field coupling simulation technology. The method comprises the following steps: setting initial positions and motion parameters of particles, and setting initial information of a flow field; determining a target fluid domain of the hyper-ellipsoidal particle coupling force; establishing a target fluid domain grid flow field information index; and establishing a hyper-ellipsoidal particle coupling force solving model, solving the hyper-ellipsoidal particle and fluid coupling force and coupling torque to calculate the hyper-ellipsoidal particle resultantforce and velocity gradient and the hyper-ellipsoidal particle resultant torque and angular velocity gradient, and realizing bidirectional coupling calculation of the hyper-ellipsoidal particles and the flow field. According to the invention, the coupling calculation of the fluid grid unit scale and the particle size of the hyper-ellipsoidal particles in the same magnitude can be realized, and theapplicability of the hyper-ellipsoidal particle and flow field coupling simulation technology is improved.

Description

technical field [0001] The invention relates to the technical field of fluid mechanics, and more specifically relates to a simulation algorithm for solving the two-way coupling between hyperellipsoidal particles and flow fields by using a semi-analytic method. Background technique [0002] The research medium in many engineering applications is in the form of particles, and the mutual coupling medium of particles and fluids is also very common in engineering, such as chemical engineering, process equipment, metallurgy, civil engineering, pharmaceuticals and other engineering fields. [0003] The calculation of particle-fluid mutual coupling can be divided by the relative size of particle diameter and fluid grid scale. There are two ways to solve the traditional coupling of particles and fluids. The first one is that the size of the fluid grid unit is about an order of magnitude smaller than the particle diameter. This solution method is called the full analytical method; the...

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Problems solved by technology

In practical engineering applications, the number of particles is often very large. For example, the number of particles in a fluidized bed often reaches hundreds of millions. Therefore, using the full-analysis method will inevitably cause a huge amount of calculation due to the huge number of meshes, and the simulation is difficult to carry out; and The grid scale in the non-analytic method is large, and in some engineering cases, the flow characteristics of the fluid cannot be accurately calculated

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