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Coupled CFD-DEM Modeling de Hamid Reza Norouzi

Coupled CFD-DEM Modeling

Autor Hamid Reza Norouzi
en Limba Engleză Hardback – 14 oct 2016

ECOSISTEMUL acestei lucrări este definit de fuziunea dintre mecanica mediilor discontinue și dinamica fluidelor, oferind un fundament tehnic solid pentru simularea interacțiunilor fluid-particulă. Subliniem faptul că Coupled CFD-DEM Modeling nu se rezumă la prezentarea teoretică a fenomenelor, ci oferă instrumente concrete de lucru, inclusiv cod sursă în FORTRAN, facilitând tranziția de la ecuațiile de mișcare la execuția numerică. Pe linia practică a volumului Multiphysics Modelling of Fluid-Particulate Systems, dar cu focus pe implementarea algoritmică și legile de contact specifice, autorul Hamid Reza Norouzi ghidează cititorul prin complexitatea sistemelor multifazice. Notăm cu interes organizarea riguroasă a materialului: prima parte este dedicată exclusiv formulării DEM, analizând modelele de tip „hard-sphere” și „soft-sphere”, urmată de o secțiune critică despre implementarea computațională. Reținem atenția deosebită acordată algoritmilor de căutare a contactului și structurii programelor de calcul, elemente esențiale pentru optimizarea timpului de procesare în ingineria chimică sau farmaceutică. Spre deosebire de abordarea mai largă din Computational Granular Mechanics and Its Engineering Applications, lucrarea de față se concentrează pe specificul cuplajului CFD-DEM, oferind soluții pentru forțele de interacțiune și condițiile la limită necesare în simularea fluxurilor industriale complexe. Această abordare echilibrată între rigoarea matematică a modelelor de forță și pragmatismul implementării numerice transformă volumul într-o resursă tehnică indispensabilă pentru modelarea proceselor de transport.

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Specificații

ISBN-13: 9781119005131
ISBN-10: 1119005132
Pagini: 432
Dimensiuni: 168 x 246 x 25 mm
Greutate: 0.77 kg
Editura: Wiley
Locul publicării:Chichester, United Kingdom

Public țintă

Researchers and postgraduate students working on multiphase flow, in chemical engineering, pharmaceutical engineering, biological sciences etc. Practitioners in industry, e.g. oil, gas, petrochemical, pharmaceutical, and food engineering.

De ce să citești această carte

Această lucrare este esențială pentru cercetătorii și inginerii din industriile chimică, petrolieră și alimentară care au nevoie de o metodologie clară de simulare a sistemelor fluid-particulă. Cititorul câștigă acces la un flux de lucru complet: de la fundamentul teoretic al metodelor DEM și CFD, până la implementarea practică prin cod FORTRAN, permițând dezvoltarea unor modele numerice personalizate pentru optimizarea proceselor industriale complexe.

Despre autor

Hamid Reza Norouzi este un specialist recunoscut în domeniul ingineriei chimice și modelării numerice a sistemelor multifazice. Expertiza sa se concentrează pe dezvoltarea și aplicarea metodelor de cuplaj între dinamica fluidelor computațională (CFD) și metoda elementelor discrete (DEM). Prin contribuțiile sale în literatura de specialitate publicată de edituri prestigioase precum Wiley, Norouzi a reușit să pună bazele unor instrumente de simulare utilizate pe scară largă în optimizarea proceselor industriale ce implică particule solide și fluxuri de fluide.

Cuprins

About the Authors xi Preface xiii 1 Introduction 1 1.1 Multiphase Coupling 2 1.2 Modeling Approaches 2 1.3 Modeling with DEM 5 1.4 CFD-DEM Modeling 7 1.5 Applications 10 1.6 Scope and Overall Plan 10 1.7 Online Content 12 References 12 Part I DEM 15 2 DEM Formulation 17 2.1 Hard-Sphere 18 2.1.1 Equation of Motion 19 2.1.2 Collision Model 19 2.1.3 Interparticle Forces 22 2.2 Soft-Sphere 24 2.2.1 Equations of Motion 25 2.3 Force-Displacement Laws 27 2.3.1 Linear Viscoelastic Model 29 2.3.2 Nonlinear Viscoelastic Models 36 2.3.3 Comparison of Viscoelastic Force-Displacement Models 45 2.3.4 Elastic Perfectly Plastic Models 49 2.4 Torque Expressions 56 2.4.1 Model A: Constant Torque Model 56 2.4.2 Model B: Viscous Model 57 2.4.3 Model C: Spring-Dashpot Model 57 2.5 Boundary and Initial Conditions 58 2.5.1 Boundary Conditions 58 2.5.2 Initial Condition 60 Nomenclature 60 References 64 3 DEM Implementation 68 3.1 Computational View 68 3.2 Program Structure 71 3.3 Contact Search Algorithms 76 3.3.1 Definition of Problem 79 3.3.2 Cell-Based Algorithms 80 3.3.3 Sort-Based Algorithms 96 3.3.4 Tree-Based Broad Search Algorithms 99 3.3.5 Fine Search for Spherical Particles 103 3.4 Integration Methods 103 3.4.1 Single-Step Methods 106 3.4.2 Multi-Step Algorithms 110 3.4.3 Predictor-Corrector Methods 112 3.4.4 Evaluation of Integration Methods 114 3.5 Spring Stiffness 119 3.5.1 Maximum Overlap 122 3.5.2 Collision Time and Maximum Contact Force 123 3.6 Wall Implementation 123 3.6.1 Definition of Wall Elements 125 3.6.2 Contact Detection 128 3.6.3 Moving Wall 136 3.7 Parallelization 138 3.7.1 Distributed Memory Parallelization 138 3.7.2 Shared-Memory Parallelization 141 Nomenclature 145 References 147 4 Non-Spherical Particles 152 4.1 Shape Representation 153 4.2 Kinematics and Dynamics of a Rigid Body 156 4.2.1 Euler Angles and Transformation Matrix 157 4.2.2 Equations of Motion 159 4.2.3 Quaternions for Rigid Body Dynamics 163 4.3 Superellipsoids 164 4.3.1 Contact Forces 166 4.3.2 Effective Radius and Curvatures 169 4.3.3 Torque Calculations 173 4.3.4 Contact Detection 174 4.4 Multi-Sphere Method 178 Nomenclature 184 References 186 5 DEM Applications to Granular Flows 189 5.1 Packing of Particles 189 5.1.1 Confined Packing 189 5.1.2 Pile Formation 192 5.1.3 Rigid and Flexible Fibers 194 5.2 Flow in Hoppers 196 5.2.1 Flow Patterns 197 5.2.2 Segregation 199 5.2.3 Discharge Rate 201 5.3 Solid Mixing 203 5.3.1 Mechanisms of Mixing and Segregation 203 5.3.2 Mixing Index 205 5.3.3 Rotating Drums 209 5.3.4 Tumbling Blenders 220 5.3.5 Shaft Batch Mixers 223 5.3.6 Continuous Mixers 229 5.4 Screw Conveying 234 5.4.1 Simulation of Screw Conveyor 237 5.4.2 Results of the Simulations 238 5.4.3 Literature 239 5.5 Film Coating 241 5.5.1 Phenomenological Models 243 5.5.2 Monte-Carlo Method 244 Nomenclature 247 References 249 Part II CFD-DEM 257 6 CFD-DEM Formulation and Coupling 259 6.1 Multiphase Coupling 260 6.1.1 Coupling Strategies 260 6.1.2 Types of Coupling 262 6.1.3 Interphase Interactions 265 6.2 Momentum Coupling 267 6.2.1 Single Phase Flow of Fluids 267 6.2.2 Fluid Resolution in CFD-DEM 274 6.2.3 Unresolved Surface CFD-DEM 275 6.2.4 Surface Force Decomposition 287 6.3 Energy Coupling 303 6.3.1 Governing Equations 304 6.3.2 Rates of Heat Transfer for Particles 308 6.3.3 Rates of Heat Transfer for Fluid 316 6.3.4 Sequence of Calculations 317 6.4 Mass Coupling 319 6.4.1 Governing Equations 319 6.4.2 Rates of Mass Transfer for Particles 324 6.4.3 Rates of Change in Fluid 329 6.4.4 Sequence of Calculations 329 Nomenclature 329 References 335 7 CFD-DEM Applications to Multiphase Flow 341 7.1 Fluidization 341 7.1.1 Macro-Scale Phenomena 342 7.1.2 Meso-Scale Phenomena 344 7.1.3 Micro-Scale Phenomena 345 7.2 Spouting 347 7.3 Pneumatic Conveying 355 7.3.1 Dilute Phase and Dense Phase Conveying 356 7.3.2 Horizontal Conveying 357 7.3.3 Vertical Conveying 359 7.4 Non-Isothermal Flows 359 7.5 Reactive Flows 362 7.6 Miscellaneous 364 Nomenclature 365 References 366 8 Interparticle Forces and External Fields 372 8.1 Governing Equations 373 8.1.1 Sequence of Calculations 375 8.2 Interparticle Forces 376 8.2.1 van der Waals Force 376 8.2.2 Liquid Bridge Force 379 8.2.3 Electrostatic Force 386 8.3 External Fields 390 8.3.1 Electric Field 390 8.3.2 Magnetic Field 393 8.3.3 Vibration Field 397 8.3.4 Acoustic Field 398 8.4 Applications 399 Nomenclature 404 References 407 Index 412

Descriere scurtă

Discusses the CFD-DEM method of modeling which combines both the Discrete Element Method and Computational Fluid Dynamics to simulate fluid-particle interactions. * Deals with both theoretical and practical concepts of CFD-DEM, its numerical implementation accompanied by a hands-on numerical code in FORTRAN * Gives examples of industrial applications

Notă biografică

Hamid Reza Norouzi holds a PhD from the University of Tehran in chemical engineering. His research interests are discrete element modeling, computational fluid dynamics and multiphase flows in chemical and pharmaceutical processes. Reza Zarghami is Head of the Pharmaceutical Engineering program and Assistant Professor at the School of Chemical Engineering at the University of Tehran. His research interests include pharmaceutical processing and manufacturing, powder technology, advanced fluid mechanics and CFD in chemical engineering, and he has published over 70 articles. Rahmat Sotudeh-Gharebagh is Director of Standard Research Institute, ISIRI, Tehran, Iran and a Professor of Chemical Engineering, at the University of Tehran. He founded the Pharmaceutical Engineering program there. His research interests include fluidization engineering, process modeling and simulation, chemical engineering education, pharmaceutical engineering and information technology. He has published three books, over 230 articles, and serves as editor-in-chief of Chemical Product and Process Modeling, and Journal of Industrial Technology Development. Navid Mostoufi is a Professor at the School of Chemical Engineering at the University of Tehran in Iran where he has taught for 14 years. His industry experience has included developing operator training simulators and feasibility studies for several companies. He is the author of more than 140 journal articles and 115 conference papers on process engineering and modeling, and is an editor for three journals including Chemical Product and Process Modeling where he is joint editor-in-chief with Professor Rahmat Sotudeh-Gharebagh.