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Flow field processing method for simulating periodic motion of particles based on lattice Boltzmann model

A technology of model simulation and processing methods, which is applied in the fields of electrical digital data processing, computational theoretical chemistry, CAD numerical modeling, etc., and can solve the problems that the moving grid cannot accurately simulate the limitations of curved pipelines, and the driving mode is not comprehensive.

Active Publication Date: 2020-07-03
GUANGXI NORMAL UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the incompleteness of the periodic physical drive simulation driving method and the limitation that the moving grid cannot accurately simulate the curved pipeline, and provide a flow field processing method based on the lattice Boltzmann model to simulate the periodic movement of particles

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  • Flow field processing method for simulating periodic motion of particles based on lattice Boltzmann model
  • Flow field processing method for simulating periodic motion of particles based on lattice Boltzmann model
  • Flow field processing method for simulating periodic motion of particles based on lattice Boltzmann model

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Embodiment

[0066] Such as figure 1 As shown, a flow field processing method for simulating the periodic motion of particles based on the lattice Boltzmann model includes the following steps:

[0067] 1) Flow field initialization: According to the Navier-Stokes equation derived from the discretized lattice gas model, a discrete grid model using n-dimensional discrete space and m-velocity space (DnQm) is used to establish a simulated flow field for simulating the periodic movement of particles. Set the solution range, boundary conditions and initial conditions of the flow field. The boundary conditions are periodic pressure boundaries. The initial conditions include fluid distribution function, density, initial velocity, node type, particle radius and particle moment of inertia;

[0068] 2) Flow field evolution: According to the LBM evolution equation, the collision and distribution function flow of the fluid nodes in the entire simulated flow field established in step 1) is performed, and...

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Abstract

The invention discloses a flow field processing method for simulating periodic motion of particles based on a lattice Boltzmann model. The method comprises the steps of (1) flow field initialization,(2) flow field evolution, (3) boundary processing, (4) momentum exchange method correction and (5) macroscopic quantity calculation. According to the method, the problem that particles in a simulatedflow field cannot directly flow out from one end of the flow field in the prior art is solved; compared with other fluid-solid coupling methods, the momentum exchange method adopted by the method hasthe advantages that the hydraulic power of the solid surface is calculated, the method is independent of the geometrical shape of particles, the form is simple, and the calculation precision is high;through correction and improvement of momentum exchange, complex-shaped pipelines which cannot be simulated by a traditional momentum exchange method and other fluid-solid coupling methods can be simulated, simulation scenes for simulating different experimental modes such as particle sorting, aggregation and migration are increased, and memory consumption is greatly reduced.

Description

technical field [0001] The invention relates to the technical fields of statistical physics, fluid mechanics and computer numerical simulation, in particular to a flow field processing method for simulating periodic particle motion based on a lattice Boltzmann model. Background technique [0002] With the rapid development of computer technology, taking advantage of the tireless characteristics of high-speed computing, numerical simulation method has gradually become one of the three scientific research methods alongside experiment and theoretical analysis. Among them, in the field of computational fluid dynamics, the lattice Boltzmann method (LBM) has become a mainstream numerical simulation method. LBM has a clear physical background, simple and efficient calculation, and simulates complex fluid behavior at the mesoscopic scale. It has been successfully used in the simulation of complex systems such as turbulence, multiphase flow, and microfluidics. [0003] In order to s...

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Application Information

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IPC IPC(8): G06F30/28G16C10/00G06F111/10G06F119/14G06F113/08
CPCG16C10/00Y02T90/00
Inventor 闻炳海叶勇周华杰
Owner GUANGXI NORMAL UNIV
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