Computational Fluid Dynamics Applied to Waste-to-Energy Processes: A Hands-On Approach

Description

Computational Fluid Dynamics Applied to Waste-to-Energy Processes: A Hands-On Approach provides the key knowledge needed to perform CFD simulations using powerful commercial software tools. The book focuses on fluid mechanics, heat transfer and chemical reactions. To do so, the fundamentals of CFD are presented, with the entire workflow broken into manageable pieces that detail geometry preparation, meshing, problem setting, model implementation and post-processing actions. Pathways for process optimization using CFD integrated with Design of Experiments are also explored. The book’s combined approach of theory, application and hands-on practice allows engineering graduate students, advanced undergraduates and industry practitioners to develop their own simulations. Cover COMPUTATIONAL FLUID DYNAMICS APPLIED TO WASTE-TO-ENERGY PROCESSES: A Hands-On Approach Copyright Dedication Preface Acknowledgments Section I: CFD workflow implementation 1 Introduction and overview of using computational fluid dynamics tools Introduction History of fluid mechanics CFD companies and resources Simulation workflow Hydrodynamics in a fluidized bed gasifier-A case study CFD applied to waste-to-energy processes Conclusions References 2 How to approach a real CFD problem-A decision-making process for gasification Introduction Problem identification Identifying the domain Preprocessing Creating a solid model Designing and creating a mesh Mesh sensitivity analysis Setting up the solver Mathematical model formulation Modeling approaches for multiphase flows General governing equations Hydrodynamic model Turbulent flow Chemical reactions model Devolatilization submodel Homogeneous gas-phase reactions submodels Heterogeneous reactions submodels Radiation model Solution setup and calculation tasks Model validation Postprocessing Conclusions, limitations, and future prospects References Section II: Combustion modeling 3 Overview of biomass combustion modeling: Detailed analysis and case study Introduction Experimental setup Creating the geometry Creating the mesh Model considerations and implementation Results display NOx formation Final remarks References 4 Overview of biomass gasification modeling: Detailed analysis and case study Introduction Problem specification Creating the geometry Meshing the geometry Setting-up the solver Postprocessing Final remarks References 5 Gasification optimization using CFD combined with Design of Experiments Introduction Experimental set-up and substrates characterization Experimental design Some considerations Discussion Design of Experiments-Single optimization Robustness Some insights about Monte Carlo Robust operating conditions Some final thoughts Conclusions References Section III: Gasification modeling 6 Advanced topics-Customization Introduction Sample function Interpreting and compiling UDF Creating a custom field functions References 7 Advanced topics-Postprocessing Introduction Problem description Solution display in CFD-Post application Creating an animation video Final remarks Reference Appendix Appendix A Mathematical model Mass balance model Momentum equations Turbulence model Granular Eulerian model Granular Eulerian model Devolatilization Homogeneous gas-phase reactions Species transport equations Heterogeneous reaction rate Energy conservation Appendix B Mathematical model Energy conservation Momentum model Mass balance model Turbulence model Granular Eulerian model Chemical reactions model Pyrolysis References Index Back Cover