Abu-Zurayk M. An aeroelastic coupled adjoint approach for multi-point desings in viscous flows: Diss. … Dr.-Ing. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Aerodynamik und Strömungstechnik, Braunschweig.- Köln: DLR, 2017. - XII,86 p. : ill. - (Forschungsbericht; 2017-10). - Res. also Germ. - Bibliogr.: p.83-86. - ISSN 1434-8454 Шифр: (Pr 1120/2017-10) 02  Место хранения:   02 | Отделение ГПНТБ СО РАН | Новосибирск

Оглавление / Contents

Kurzfassung .................................................... ii Abstract ...................................................... iii Table of Contents .............................................. iv List of Figures ................................................ vi List of Tables ............................................... viii Nomenclature ................................................... ix Acknowledgement ............................................... xii Chapter 1: Introduction ......................................... 1 1.1 Problem Statement .......................................... 1 1.2 Background on Aerodynamic Optimization ..................... 2 1.3 Aero-Structural Effects on Aircraft Design ................. 4 1.4 Literature Review .......................................... 5 1.5 Objective and Outline ...................................... 7 Chapter 2: Adjoint Approach for Aerodynamic Shape Optimization .. 8 2.1 Optimization Algorithms .................................... 8 2.2 Gradients Computation Methods ............................. 10 2.3 Formulation of the Adjoint Approach ....................... 14 2.4 Application of the Discrete Adjoint Approach for Aerodynamic Shape Optimization ............................ 18 Chapter 3: Adjoint formulation for Coupled Aero-Elastic Systems ........................................................ 26 3.1 Aero-Structural Problems .................................. 26 3.2 Derivation of the Coupled Aero-Structural Adjoint ......... 32 3.3 Terms of the Coupled Aero-Structural Adjoint Equations .... 35 3.4 Solution of the Coupled Aero-Elastic Adjoint Equation ..... 42 3.5 Convergence of the Coupled Aero-Elastic Adjoint Solution .. 43 3.6 Terms of the Gradients .................................... 44 Chapter 4: Elements of the Aero-Elastic Coupled Optimization ... 47 4.1 The Computational Structure Model ......................... 48 4.2 Effect of Considering Viscosity ........................... 48 4.3 CFD Mesh Study ............................................ 50 4.4 Optimization Algorithm Study .............................. 54 4.5 Design Parameters Study ................................... 55 Chapter 5: Optimization Scenarios .............................. 60 5.1 Unconstrained Single-Point Optimization ................... 60 5.2 Unconstrained Multi-Point Optimization .................... 63 5.3 Constrained Single-Point Optimization ..................... 69 5.4 Constrained Multi-Point Optimization ...................... 74 5.5 Computational Efficiency .................................. 77 Chapter 6: Conclusions and Outlook ............................. 81 References ..................................................... 83