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A semi-analytical calculation method for two-way coupling between hyperellipsoidal particles and flow field

A calculation method and a two-way coupling technology, applied in the field of simulation algorithms, can solve the problems of large grid scale, inaccurate calculation of fluid flow characteristics, and difficulty in simulation, so as to achieve the effect of improving applicability

Active Publication Date: 2022-03-01
TIANJIN UNIV
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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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  • A semi-analytical calculation method for two-way coupling between hyperellipsoidal particles and flow field
  • A semi-analytical calculation method for two-way coupling between hyperellipsoidal particles and flow field
  • A semi-analytical calculation method for two-way coupling between hyperellipsoidal particles and flow field

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Embodiment

[0156] Take the calculation of the coupling force of a single static ultra-spherical particle uniform flow as an example:

[0157] 1) The fluid medium is air with a density of 1.205kg / m 3 , viscosity is 1.81x10 -5 Pa.s. Hyperellipsoid parameters are: a=b=c=1mm, s 1 =s 2 =20, approximate cube shape, the Reynolds number (with the side length of the cube as the characteristic length) ranges from 100 to 1000.

[0158] 2) Fluid calculation settings, the length x width x height of the fluid domain is 100mm x 40mm x 40mm, in which the flow direction of the fluid domain is the length direction, and the hyperellipsoidal particles are placed in the center of the fluid domain; the side length of the structured grid is a / 4; Select the laminar flow model.

[0159] 3) Discrete element calculation settings. This case examines the coupling force of a single hyperellipsoidal particle, so the discrete element module does not need to be set.

[0160] 4) Calculation of target fluid domain a...

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Abstract

The invention discloses a semi-analytic calculation method for two-way coupling of super-ellipsoidal particles and a flow field, and aims to provide an analytical method for improving the applicability of the coupling simulation technology of super-ellipsoidal particles and a flow field. Including: setting the initial position and motion parameters of the particles, setting the initial information of the flow field; determining the target fluid domain of the super-ellipsoidal particle coupling force; establishing the grid flow field information index of the target fluid domain; establishing a solution model for the super-ellipsoidal particle coupling force , solve the coupling force and coupling torque between super-ellipsoidal particles and fluid, calculate the resultant force and velocity gradient of super-ellipsoidal particles, the resultant torque and angular velocity gradient of super-ellipsoidal particles, and realize the two-way coupling calculation of super-ellipsoidal particles and flow field. The invention can realize the coupling calculation of the fluid grid unit scale and the super ellipsoidal particle size at the same level, and improves the applicability of the coupling simulation technology of the super ellipsoidal particle and the flow field.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 贺丽萍刘正先
Owner TIANJIN UNIV
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