Using CFD to Understand Multiphase and Wet Gas Measurement

Computational fluid dynamics (CFD) flow modelling has proved to be a useful tool in single-phase flow metering. More recently, the increase in computer power has made multiphase models viable. However, there is a range of modelling approaches, which makes practical simulation of the behaviour of multiphase and wet gas flows in metering and/or sampling devices as much an art as a science. This paper introduces alternative modelling approaches to show what can be achieved using CFD modelling and to highlight the limitations of the technique. A series of case studies are presented in which CFD analysis has been used to study the following issues in multiphase and wet gas measurement or sampling: Effects of heavy oil multiphase flow in a Venturi Behaviour of multiphase swirl flow in a Venturi Modelling of wet gas flows in Venturis, cone meters, and orifice plates Effective sampling methods