Lattice Boltzmann simulation of non-Fourier heat conduction with phase change

摘要

The lattice Boltzmann method (LBM) combined with the enthalpy method is a very effective method to solve the solid-liquid phase transition problem. However, when the heat flux is very high or the time of the process is in the same order of magnitude as the relaxation time, it is necessary to consider the non-Fourier effect in heat conduction. At this time, whether the LBM-BGK format based on Bhatnagar-Gross-Krook (BGK) approximation is still valid remains to be discussed. In this paper, the hyperbolic lattice Boltzmann method (HLBM) is combined with the enthalpy method to solve the non-Fourier solid-liquid phase change problem. By solving the non-Fourier heat conduction problem and the Fourier solid-liquid phase change problem, the numerical solution is compared with the analytical solution to verify the accuracy of the algorithm. The effect of different relaxation times on the solid-liquid phase transition is analyzed. In addition, the effect of changes in thermal diffusivity due to state changes on the non-Fourier solid-liquid phase transition is discussed.