1. A method for a hydrocarbon production system, comprising: collecting production system data; performing a simulation based on the collected data, a fluid model, and a fully-coupled set of equations; expediting convergence of a solution for the simulation by reducing occurrences of non-physical attributes during the simulation, wherein said reducing includes damping mass changes for components with negative mobility and calculating a damp factor for components with positive mobility to preserve volume balance; and outputting control parameters determined for the solution for use with the production system.