Multiphase Chapter 5: Introduction to Multiphase Flow

Multiphase flows occur when gas, liquid, or solid phases coexist and interact through momentum, heat, and mass transfer. This chapter introduces the main regimes and explains how they are modeled in CFD using ANSYS Fluent. From simplified mixture models to detailed Eulerian formulations and interface-capturing VOF methods, the focus is on understanding the assumptions, strengths, and limitations of each approach. Practical guidelines for model selection and industrial examples help connect theory to real-world applications such as bubble columns, sprays, fluidized beds, and free-surface flows