New particle-locating method accounting for source distribution and particle-field interpolation for hybrid modeling of strongly coupled two-phase flows in arbitrary coordinates

摘要

A new particle-locating method is described for efficient Eulerian-Lagrangian modeling of two-phase flows in general coordinates. This is an improvement of the two recent methods of Chen and Zhou and Leschziner, which focus solely on identifying the host Eulerian control volume to which the particle has moved at the end of each time step. In contrast, the present method can simultaneously locate the host control volume and determine coefficients for source distribution and particle-field interpolation. The performance of the present method is compared with that of Chen's and Zhou and Leschziner's approaches for host control-volume detection and for strongly coupled two-phase flows. It is found that the distribution of two-way coupling sources over the particle trajectory-crossed control volumes can stabilize the overall iterative solution to coupled two-phase flow fields, and that the particle-field interpolation can smooth numerical predictions, allowing the use of relatively large time steps for Lagrangian integration. For the two-phase flow considered, it is found that the present particle-locating method requires a smaller number of coupling iterations than that of Zhou and Leschziner, thus offering higher overall computational efficiency of the two-phase flow solution.