Book excerpt: This book contains a detailed account of modeling aspects of all the relevant concerns of steel industry. The text explores the Process Modeling Fundamentals, Basic Concepts of Numerical Heat Transfer and Fluid Flow, Fundamentals of Flow Reactors, Numerical Modeling of Different Processes in Steel Industry and Brief Working Guidance for CFD Software Package ANSYS Fluent. Most importantly, this book will help readers to formulate live problem-solving strategy in steel making industry.