The numerical models used in calculating the particle trajectories, wall collisions and turbulence based movement, are presented. A venturi test case with high particle loading is treated and numerical and experimental results are compared. Convergence difficulties are discussed and a source smoothing method is introduced. Numerical and experimental results are compared and the reasons for the differences treated. Introduction Two-phase particulate flows arise in industrial applications such as gas cleaning cyclones and circulating fluidised bed particle separators.
Numerical simulation is a method of current interest for predicting particulate flows.
In this kind of particle laden flows the dispersed phase calculations can be performed by employing a Lagrangian or Eulerian approach. The Lagrangian approach is found preferable due to its superior ability to handle the abovementioned problems. The calculation of the particle trajectories is based on an analytical integration of the particle's momentum equation where aerodynamic drag and gravity are the forces considered. An optimum time step is calculated using an adaptive regulating method. A simple venturi is chosen as an initial test case.