Abstract-Preconditioning for the simultaneous solution of non-filtered and filtered Eulerian-Eulerian gas-solid flow models is investigated. The impact of the gas-solid interaction source terms is shown. A possible approach for a new preconditioner is proposed. The gas-solid interaction source terms are accounted for via the addition of a gas-solid interaction history force term to the preconditioner. Keywords: Preconditioning, Gas-solid flows, Mixture speed of sound, Gas-solid interactions, Filtering I. INTRODUCTION
