Nature and industry both witness the occurrence of multiphase flows, yet understanding the underlying principles is anything but straightforward. Hence, the purpose of this book is to offer an in-depth examination of this subject. The investigation revolves around scenarios where solid particles find themselves immersed within liquids or gases.

The book commences by exploring the interactions between particles and fluids, delving into the multitude of forces at play. Since similar texts have covered this topic extensively, we swiftly progress to subsequent chapters that delve into particle interactions.

Initially, the focus lies on describing the foundational phenomenon of contact mechanics between two solid bodies. Subsequently, we explore how this fundamental understanding can be applied to model inter-particle collisions, including potential adhesion or attraction. Thus, the book presents an algorithm that guides readers in gradually constructing a computational tool capable of simulating fluid flows containing solid particles.