Comparison of numerical schemes for 3D lattice Boltzmann simulations of moving rigid particles in thermal fluid flows

The handling of moving boundaries of immersed particles requires special attention in thermal lattice Boltzmann simulations of particle-laden flows. The following three issues are of special importance: First, the thermal boundary conditions (Dirichlet or Neumann) have to be fulfilled on the particle surface. Second, reasonable values have to be found for temperature distributions in grid nodes that are uncovered by moving particles. Third, the heat transfer between particulate and fluid phase has to be evaluated efficiently. In this work, we present new numerical schemes for all of these three key aspects. They rely to a great degree on existing schemes for the hydrodynamic lattice Boltzmann method. In four benchmark cases we assess which of them are the most favourable ones and we also show to what extent schemes based on the same principles behave similarly or differently in the flow and heat transfer simulation. [Display omitted] •New interpolated bounce-back and refilling schemes for the thermal LB method.•New efficient evaluation method for the heat transfer between particles and fluid.•Performance comparison of the proposed techniques with hydrodynamic LB techniques.•Identification of the best framework for particle-fluid flows with heat transfer.