Thermal fluid simulation method based on discrete lattice Boltzmann dual-distribution model

Abstract

The invention discloses a thermal fluid simulation method based on a discrete lattice Boltzmann dual-distribution model, and relates to the technical field of physically-based fluid simulation. The invention aims to achieve the purpose of fluid simulation containing thermal conduction. The method is based on a physically real discrete lattice-Boltzmann method (LBM) dual-distribution model. On the basis of LBM fluid simulation, research is carried out on fluid simulation containing thermal conduction. First, flow field modeling is carried out by an LBM based on the Eulerian grid to build the main part of fluid simulation; then, thermal conduction of fluid is calculated using an LBM dual-distribution function of cohesionless heat dissipation and compression work, and mutual conversion of heat and momentum in the LBM dual-distribution function is calculated using a proposed coupling algorithm; and computer simulation of wind generation, thermal fluid flow, fluid heat transfer and other thermal fluid phenomena based on physics can be carried out.

Description

technical field [0001] The invention relates to the technical field of thermal fluid simulation, in particular to a thermal fluid simulation method based on a discrete lattice Boltzmann double distribution model. Background technique [0002] At present, the LBM method, as a strictly physically realistic computational fluid dynamics simulation method, has important applications in many fluid simulation fields. There have been a lot of mature and stable research and application of LBM methods in isothermal environment or athermal environment, and Thermohydrodynamics (Thermohydrodynamics), as a basic problem in the field of LBM, has been favored by many scholars for a long time. To explore a method with stable numerical value, good accuracy, simple algorithm structure and the ability to reflect the basic characteristics of heat flow, but so far there is no sound model that can perfectly solve the problem of heat flow. [0003] Generally speaking, the LBM models of heat flow c...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the shortcomings and deficiencies of the existing simulated thermal fluid motion model, and propose a thermal fluid simulation method based on the discrete lattice Boltzmann double distribution model, the method realizes thermal energy within the framework of the double distribution model. The coupling with kinetic energy solves the disadvantage that the non-coupling model cannot realize the conversion of thermal energy to kinetic energy. At the same time, it has less complexity and calculation amount than the existing coupling model, which satisfies the simulation of physical real thermal fluid motion.

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