A differential-algbraic model for two-phase flow instabilities in pipeline-riser systems

摘要

A differential-algebraic system is presented to model severe slug flows in pipeline-riser systems. Equations derive from the space integration of an isothermal drift-flux model whose inertia terms are neglected. The slip and wall friction laws are expressed as smooth functions of the void fraction, pressure and superficial mixture velocity of the flow. The numerical solution is computed with stiffly accurate implicit Runge-Kutta methods. Then, comparisons between laboratory experiments and numerical computations are performed.