Development of low-diffusion flux-splitting methods for dense gas–solid flows

The development of a class of low-diffusion upwinding methods for computing dense gas–solid flows is presented in this work. An artificial compressibility/low-Mach preconditioning strategy is developed for a hyperbolic two-phase flow equation system consisting of separate solids and gas momentum and continuity equations. The eigenvalues of this system are used to devise extensions of the AUSM+ [1] and LDFSS [2] flux-splitting methods that provide high resolution capturing of bubble growth and collapse in gas–solid fluidized beds. Applications to several problems in fluidization are presented.