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Abstract: Lattice
Boltzmann method, which is different from traditional macroscopic and
microscopic models of computational fluid dynamics, is presented. The
movement and collision of fluid micelle are controlled by lattice
Boltzmann equation and equilibrium distribution functions, and
distribution functions of fluid micelle can be solved from lattice
Boltzmann equation. Thus physical quantities such as velocity and
pressure are interpreted by the statistic sum form of distribution
functions. Furthermore, the fluid flow in the 2D central plane of
continuous slab casting mold is computed, especially the evolution with
time of flow with high Reynolds number is simulated, and the simulated
flow patterns are found to be in excellent agreement with the previous
experiment results, which show that the turbulent flow with high
Reynolds number inside the mold is swirly, asymmetric and unsteady.
These results indicate that the fluctuation of quantity has been
strengthened as long as Reynolds number is high enough, which destroys
the symmetric eddy structure, and the fluid flow becomes asymmetric and
unsteady.
Key words: Lattice
Boltzmann method Continuous casting mold Navier-Stokes equations
Turbulent flow
CLC No: TG156
国家自然科学基金和宝钢联合基金资助项目(50474088). Received
20051012, received in revised form 20060313 |