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Preface vii <p>Notations  ix</p> <p><b>Chapter 1. General Points  1</b></p> <p>1.1. Introduction  1</p> <p>1.2. Tools to analyze and develop control strategies 2</p> <p>1.2.1. Numerical simulations 2</p> <p>1.2.2. Sensors 3</p> <p>1.2.3. Actuators 20</p> <p><b>Chapter 2. Summary of the Main Characteristics of Wall Turbulence 23</b></p> <p>2.1. Introduction  23</p> <p>2.2. General equations 23</p> <p>2.2.1. Eulerian relations  24</p> <p>2.3. Notations  25</p> <p>2.4. Reynolds equations  26</p> <p>2.5. Exact relations and FIK identity  27</p> <p>2.6. Equations for a turbulent boundary layer 32</p> <p>2.7. Scales in a turbulent wall flow 34</p> <p>2.8. Turbulent viscosity closures  35</p> <p>2.9. Turbulent intensities of the velocity components  47</p> <p>2.10. Vorticity and near wall coherent structures 51</p> <p><b>Chapter 3. Passive Control  65</b></p> <p>3.1. Introduction 65</p> <p>3.2. Large eddy (outer layer) breakup devices, LEBUs (OLDs) 66</p> <p>3.2.1. General 66</p> <p>3.2.2. Alteration of the inner structure by outer layer devices  67</p> <p>3.3. Riblets  72</p> <p>3.3.1. General 72</p> <p>3.3.2. Effect of the riblets on the fine structure of wall turbulence 76</p> <p>3.3.3. Effect of the protrusion height 84</p> <p>3.4. Superhydrophobic surfaces  93</p> <p><b>Chapter 4. Active Control 99</b></p> <p>4.1. Introduction 99</p> <p>4.2. Local blowing 100</p> <p>4.3. Ad-hoc control 107</p> <p>4.4. Transverse wall oscillations 115</p> <p>4.5. Alternated spanwise Lorenz forcing and electromagnetic (EM) control  123</p> <p>4.6. Extensions of spanwise forcing 131</p> <p>4.7. Reynolds number dependence  132</p> <p>4.8. Suboptimal active control  134</p> <p>4.9. Optimal active control  143</p> <p>4.10. Optimal linear control  147</p> <p>4.11. Neural networks 156</p> <p>4.12. Stochastic synchronization of the wall turbulence and dual control 157</p> <p>Bibliography  167</p> <p>Index 185</p>

<p><strong>Sedat Tardu</strong> is Associate Professor at Grenoble University in France where he teaches turbulent shear flows, heat transfer, fluid dynamics, and chaos. His research area includes canonical and non-canonical wall turbulence, active and passive control of near wall turbulence, unsteady wall layers, mixing and micro-mixing, and microfluidics. He has been a visiting researcher at several universities (Ecole Polytechnique Fédérale de Lausanne, Imperial College London, Beihang University Beijing) and he is author of more than 200 papers in peer-reviewed journals, and international conferences and of several book chapters.

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