Solving transient conduction and radiation heat transfer problems using the lattice Boltzmann method and the finite volume method

The lattice Boltzmann method (LBM) was used to solve the energy equation of a transient conduction–radiation heat transfer problem. The finite volume method (FVM) was used to compute the radiative information. To study the compatibility of the LBM for the energy equation and the FVM for the radiative transfer equation, transient conduction and radiation heat transfer problems in 1-D planar and 2-D rectangular geometries were considered. In order to establish the suitability of the LBM, the energy equations of the two problems were also solved using the FVM of the computational fluid dynamics. The FVM used in the radiative heat transfer was employed to compute the radiative information required for the solution of the energy equation using the LBM or the FVM (of the CFD). To study the compatibility and suitability of the LBM for the solution of energy equation and the FVM for the radiative information, results were analyzed for the effects of various parameters such as the scattering albedo, the conduction–radiation parameter and the boundary emissivity. The results of the LBM–FVM combination were found to be in excellent agreement with the FVM–FVM combination. The number of iterations and CPU times in both the combinations were found comparable.