A 3-DIMENSIONAL LAGRANGIAN SOLVER FOR DISPERSE MULTIPHASE FLOWS ON ARBITRARY, GEOMETRICALLY COMPLEX FLOW DOMAINS USING BLOCK-STRUCTURED NUMERICAL GRIDS

摘要

A Lagrangian solver for the numerical simulation of disperse multiphase flows is presented. The solver is applicable to the prediction of flows in complex geometries. The flow domain is descretized by a block-structured numerical grid consisting of arbitrary hexahedral control volumes. Emphasis is layed on the treatment of geometrical issues. In a boundary fitted grid the corner points of the control volume faces do not necessarily form at a surface. For porpuses of particle localization and particle tracing the representation of the control volume is changed to a dodecahedral one. Two different methods are presented for the localization of a particle's initial position in a grid block. Further an efficient algorithm is given for tracing a particle on the numerical grid. By using this algorithm the source terms due to particle fluid interaction can be calculated simultanously when searching the new particle location. Test case calculations are presented for the flow in a cyclone separator.