Ciobaka V. Validation of numerical simulations for separation control on high-lift configurations / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Aerodynamik und Strömungstechnik, Braunschweig. - Köln: DLR, 2014. - vi, 123 p.: ill. - (Forschungsbericht; 2014-11). - Bibliogr.: p.109-117. - Пер. загл.: Валидация численного имитационного моделирования для управления срывом потока на конфигурациях с большой подъемной силой. - ISSN 1434-8454  Место хранения:   02 | Отделение ГПНТБ СО РАН | Новосибирск

Оглавление / Contents

1 Introduction and State of the Art ............................ 1 1.1 Introduction ............................................ 1 1.2 State of the Art ........................................ 2 1.2.1 Experimental Research ............................ 2 1.2.2 Numerical Research ............................... 5 1.2.3 Active Flow Control of Flap Separation ........... 8 1.3 Objective and Outline .................................. 13 2 Numerical Method for Unsteady CFD Simulations ............... 17 2.1 Navier-Stokes Equations ................................ 17 2.2 Treatment of Turbulent Flows ........................... 19 2.2.1 Reynolds-Averaged Navier-Stokes Equations ....... 19 2.2.2 Turbulence Modeling ............................. 21 2.3 Flow Solver DLR TAU-Code and Unsteady Simulations ...... 26 2.3.1 DLR Solver TAU .................................. 26 2.3.2 Boundary Conditions ............................. 28 2.3.3 Unsteady Methodology ............................ 31 2.3.4 Transition Prediction ........................... 32 3 Validation of the DLR TAU-Code for a High-Lift Airfoil with Massive Flap Separation ................................ 35 3.1 Reference Experiment ................................... 37 3.1.1 Wind Tunnel Model DLR-F15 ....................... 37 3.1.2 DLR-F15 Wind Tunnel Test in DNW-KKK ............. 38 3.2 Mesh Generation ........................................ 39 3.3 Simulation and Validation .............................. 40 3.3.1 Inflow Conditions and Numerical Setup ........... 40 3.3.2 Numerical Results and Validation with Experimental Data ............................... 42 3.4 Unsteady Flow Features ................................. 46 3.5 Actuator Slit: Its Impact on the Baseline Flow ......... 48 3.6 Flap Flow Separation Prediction: Influence of Turbulence Modeling .................................... 48 4 Verification of the CFD Model for Active Flow Control ....... 51 4.1 Spatial Discretization ................................. 52 4.2 Time Discretization .................................... 58 4.3 Actuator Modeling ...................................... 58 4.4 Flap Flow Separation Control: Influence of Turbulence Modeling ............................................... 63 5 Validation of Numerical Simulation for the Pulsed Blowing AFC-Concept ................................................. 67 5.1 2D Validation with Time-Averaged Experimental Data ..... 68 5.1.1 Reference Experiment: DLR-F15 Wind Tunnel Test in F-LSWT ....................................... 68 5.1.2 Best AFC Setup and Effects of Blowing Momentum Coefficient ..................................... 69 5.1.3 Effects of the Actuation Frequency .............. 72 5.2 3D Validation with Time-Accurate Experimental Data ..... 74 5.2.1 Reference Experiment: DLR-F15 Wind Tunnel Test in GroWiKa ...................................... 75 5.2.2 3D Mesh Generation for the 2D Model DLR-F15 with Double-Slot Actuation ...................... 80 5.2.3 Assessment of 3D Baseline Flow .................. 80 5.2.4 Assessment of 3D Flow with Active Flow Control .. 84 5.2.5 Assessment of AFC Parameters .................... 92 6 Conclusions ................................................ 105 A Tables ................................................... 119