Advances in Transitional Flow Modeling : Applications to Helicopter Rotors.
Sheng, Chunhua.
Advances in Transitional Flow Modeling : Applications to Helicopter Rotors. - 1 recurso en línea (140 páginas) - SpringerBriefs in Applied Sciences and Technology .
SpringerLink
Preface; Acknowledgments; Contents; 1 Introduction; Abstract; 1.1 Background; 1.2 Transition Modes; 1.2.1 Natural Transition; 1.2.2 Bypass Transition; 1.2.3 Separation-Induced Transition; 1.2.4 Reverse Transition; 1.3 Transition Parameters; 1.3.1 Free-Stream Turbulence; 1.3.2 Pressure Gradient; 1.3.3 Surface Roughness; 1.3.4 Unsteady Velocity Fluctuation; 1.3.5 Turbulent Viscosity; 1.3.6 Other Factors; References; 2 Transition Prediction; Abstract; 2.1 Overview; 2.2 Methods Based on Stability Theory; 2.2.1 The eN Method; 2.2.2 Parabolized Stability Equation Method. 2.3 Statistical Methods of Transition Modelling2.3.1 Low Reynolds Number Turbulence Models; 2.3.2 Correlation-Based Intermittency Models; 2.3.3 The Laminar Kinetic Energy Method; 2.4 Transition Simulation Methods; References; 3 Transition Model; Abstract; 3.1 The Langtry-Menter Transition Model; 3.1.1 Transport Equation of Intermittency; 3.1.2 Transport Equation of Transition Onset Reynolds Number; 3.1.3 Correlation Formula; 3.2 Modifications of Transition Model; 3.2.1 Local Free-Stream Turbulence Intensity; 3.2.2 Separation Correction Method; 3.3 Integration with the S-A Turbulence Model. 3.4 Integration with the SST Turbulence Model3.5 Numerical Procedures; 3.5.1 Normalized Transport Equations; 3.5.2 Discretization Scheme; 3.5.3 Flux Evaluation; 3.5.4 Time Marching Method; References; 4 Validations in 2-D Flows; Abstract; 4.1 Description; 4.2 Flat Plates; 4.2.1 Zero-Pressure Gradients; 4.2.2 Non-zero Pressure Gradients; 4.3 Two-Dimensional Airfoils; 4.3.1 Aerospatiale-A Airfoil; 4.3.2 VA-2 Supercritical Airfoil; 4.3.3 S809 Wind Turbine Airfoil; 4.3.4 NACA 4412 Airfoil; 4.4 Summary; References; 5 Applications for 3-D Rotors; Abstract; 5.1 XV-15 Proprotor. 5.1.1 XV-15 Profile and Conditions5.1.2 Hover Performance; 5.1.3 Skin Frictions; 5.1.4 XV-15 Flow Physics; 5.2 JVX Proprotor; 5.2.1 JVX Geometry and Conditions; 5.2.2 Hover Mode; 5.2.3 Modelling Issues; 5.2.4 Airplane Mode; 5.2.5 JVX Characteristics; 5.3 S-76 Scaled Rotor; 5.3.1 S-76 Geometry and Conditions; 5.3.2 CFD Meshes; 5.3.3 Effect of Turbulence Models; 5.3.4 S-76 Characteristics; 5.3.5 Effect of Tip Shapes; 5.4 Summary; References.
This book provides a comprehensive description of numerical methods and validation processes for predicting transitional flows based on the Langtry-Menter local correlation-based transition model, integrated with both one-equation Spalart-Allmaras (S-A) and two-equation Shear Stress Transport (SST) turbulence models. A comparative study is presented to combine the respective merits of the two coupling methods in the context of predicting the boundary-layer transition phenomenon from fundamental benchmark flows to realistic helicopter rotors. The book will of interest to industrial practitioners working in aerodynamic design and the analysis of fixed-wing or rotary wing aircraft, while also offering advanced reading material for graduate students in the research areas of Computational Fluid Dynamics (CFD), turbulence modeling and related fields.
3319325752 3319325760 9783319325750 9783319325767
Rotores
TA357.5.T87 / S546 2017 EB
Advances in Transitional Flow Modeling : Applications to Helicopter Rotors. - 1 recurso en línea (140 páginas) - SpringerBriefs in Applied Sciences and Technology .
SpringerLink
Preface; Acknowledgments; Contents; 1 Introduction; Abstract; 1.1 Background; 1.2 Transition Modes; 1.2.1 Natural Transition; 1.2.2 Bypass Transition; 1.2.3 Separation-Induced Transition; 1.2.4 Reverse Transition; 1.3 Transition Parameters; 1.3.1 Free-Stream Turbulence; 1.3.2 Pressure Gradient; 1.3.3 Surface Roughness; 1.3.4 Unsteady Velocity Fluctuation; 1.3.5 Turbulent Viscosity; 1.3.6 Other Factors; References; 2 Transition Prediction; Abstract; 2.1 Overview; 2.2 Methods Based on Stability Theory; 2.2.1 The eN Method; 2.2.2 Parabolized Stability Equation Method. 2.3 Statistical Methods of Transition Modelling2.3.1 Low Reynolds Number Turbulence Models; 2.3.2 Correlation-Based Intermittency Models; 2.3.3 The Laminar Kinetic Energy Method; 2.4 Transition Simulation Methods; References; 3 Transition Model; Abstract; 3.1 The Langtry-Menter Transition Model; 3.1.1 Transport Equation of Intermittency; 3.1.2 Transport Equation of Transition Onset Reynolds Number; 3.1.3 Correlation Formula; 3.2 Modifications of Transition Model; 3.2.1 Local Free-Stream Turbulence Intensity; 3.2.2 Separation Correction Method; 3.3 Integration with the S-A Turbulence Model. 3.4 Integration with the SST Turbulence Model3.5 Numerical Procedures; 3.5.1 Normalized Transport Equations; 3.5.2 Discretization Scheme; 3.5.3 Flux Evaluation; 3.5.4 Time Marching Method; References; 4 Validations in 2-D Flows; Abstract; 4.1 Description; 4.2 Flat Plates; 4.2.1 Zero-Pressure Gradients; 4.2.2 Non-zero Pressure Gradients; 4.3 Two-Dimensional Airfoils; 4.3.1 Aerospatiale-A Airfoil; 4.3.2 VA-2 Supercritical Airfoil; 4.3.3 S809 Wind Turbine Airfoil; 4.3.4 NACA 4412 Airfoil; 4.4 Summary; References; 5 Applications for 3-D Rotors; Abstract; 5.1 XV-15 Proprotor. 5.1.1 XV-15 Profile and Conditions5.1.2 Hover Performance; 5.1.3 Skin Frictions; 5.1.4 XV-15 Flow Physics; 5.2 JVX Proprotor; 5.2.1 JVX Geometry and Conditions; 5.2.2 Hover Mode; 5.2.3 Modelling Issues; 5.2.4 Airplane Mode; 5.2.5 JVX Characteristics; 5.3 S-76 Scaled Rotor; 5.3.1 S-76 Geometry and Conditions; 5.3.2 CFD Meshes; 5.3.3 Effect of Turbulence Models; 5.3.4 S-76 Characteristics; 5.3.5 Effect of Tip Shapes; 5.4 Summary; References.
This book provides a comprehensive description of numerical methods and validation processes for predicting transitional flows based on the Langtry-Menter local correlation-based transition model, integrated with both one-equation Spalart-Allmaras (S-A) and two-equation Shear Stress Transport (SST) turbulence models. A comparative study is presented to combine the respective merits of the two coupling methods in the context of predicting the boundary-layer transition phenomenon from fundamental benchmark flows to realistic helicopter rotors. The book will of interest to industrial practitioners working in aerodynamic design and the analysis of fixed-wing or rotary wing aircraft, while also offering advanced reading material for graduate students in the research areas of Computational Fluid Dynamics (CFD), turbulence modeling and related fields.
3319325752 3319325760 9783319325750 9783319325767
Rotores
TA357.5.T87 / S546 2017 EB