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De Wilde, J. (author), Baudrez, E. (author), Heynderickx, G. (author), Marin, G.B. (author)Local preconditioning for Eulerian-Eulerian gas-solid flow calculations with variable gas density is investigated. The performance of simultaneous solution algorithms for low-Mach calculations is strongly related to preconditioning. The gas-solid drag source terms are at the origin of a solid volume fraction and frequency dependency of the...conference paper 2006