Chin, Wilson C.,
Modern aerodynamic methods for direct and inverse applications / Wilson C. Chin. - 1 online resource
Includes bibliographical references and index.
Cover; Title Page; Copyright Page; Table of Contents; Preface; Acknowledgements; 1 Basic Concepts, Challenges and Methods; 1.1 Governing Equations -- An Unconventional Synopsis; 1.2 Fundamental "Analysis" or "Forward Modeling" Ideas; 1.3 Basic "Inverse" or "Indirect Modeling" Ideas; 1.4 Literature Overview and Modeling Issues; 1.5 References; 2 Computational Methods: Subtleties, Approaches and Algorithms; 2.1 Coding Suggestions and Baseline Solutions; 2.1.1 Presentation Approach; 2.1.2 Programming Exercises; 2.1.3 Model Extensions and Challenges 2.2 Finite Difference Methods for Simple Planar Flows2.2.1 Finite Differences -- Basic Concepts; 2.2.2 Formulating Steady Flow Problems; 2.2.3 Steady Flow Problems; 2.2.4 Wells and Internal Boundaries; 2.2.5 Point Relaxation Methods; 2.2.6 Observations on Relaxation Methods; 2.3 Examples -- Analysis, Direct or Forward Applications; 2.3.1 Example 1 -- Thickness Solution, Centered Slit in Box; 2.3.2 Example 2 -- Half-Space Thickness Solution; 2.3.3 Example 3 -- Centered Symmetric Wedge Flow; 2.3.4 Example 4 -- General Solution with Lift, Centered Slit 2.3.5 Example 5 -- Transonic Supercritical Airfoil with Type-Dependent Differencing Solution, Subsonic, Mixed Flow and Supersonic2.3.6 Example 6 -- Three-Dimensional, Thickness-Only, Finite, Half-Space Solution; 2.4 Examples -- Inverse or Indirect Applications; 2.4.1 Example 1 -- Constant Pressure Specification and Symmetric Thin Ellipse; 2.4.2 Example 2 -- Inverse Problem, Pressure Specification, Centered Slit, Trailing Edge Closed vs Opened; 2.4.3 Example 3 -- Inverse Problem, Pressure Specification, Three-Dimensional Half-Space, Closed Trailing Edge, Nonlifting Symmet 3 Advanced Physical Models and Mathematical Approaches3.1 Nonlinear Formulation for Low-Frequency Transonic Flow; 3.1.1 Introduction; 3.1.2 Analysis; 3.1.3 Discussion and Summary; 3.1.4 References; 3.2 Effect of Frequency in Unsteady Transonic Flow; 3.2.1 Introduction; 3.2.2 Numerical Procedure; 3.2.3 Results; 3.2.4 Concluding Remarks; 3.2.5 References; 3.3 Harmonic Analysis of Unsteady Transonic Flow; 3.3.1 Introduction; 3.3.2 Analytical and Numerical Approach; 3.3.3 Calculated Results; 3.3.4 Discussion and Closing Remarks; 3.3.5 References 3.4 Supersonic Wave Drag for Nonplanar Singularity Distributions3.4.1 Introduction; 3.4.2 Analysis; 3.4.3 Summary; 3.4.4 References; 3.5 Supersonic Wave Drag for Planar Singularity Distributions; 3.5.1 Introduction; 3.5.2 Analysis; 3.5.3 Concluding Remarks; 3.5.4 References; 3.6 Pseudo-Transonic Equation with a Diffusion Term; 3.6.1 Introduction; 3.6.2 Analysis; 3.6.3 Summary; 3.6.4 References; 3.7 Numerical Solution for Viscous Transonic Flow; 3.7.1 Introduction; 3.7.2 Analysis; 3.7.3 Numerical Approach; 3.7.4 Sample Calculation; 3.7.5 Discussion; 3.7.6 References
Just when classic subject areas seem understood, the author, a Caltech, M.I.T. and Boeing trained aerodynamicist, raises profound questions over traditional formulations. Can shear flows be rigorously modeled using simpler "potential-like" methods versus Euler equation approaches' Why not solve aerodynamic inverse problems using rapid, direct or forward methods similar to those used to calculate pressures over specified airfoils' Can transonic supercritical flows be solved rigorously without type-differencing methods' How do oscillations affect transonic mean flows, which in turn influence oscillatory effects' Or how do hydrodynamic disturbances stabilize or destabilize mean shear flows' Is there an exact approach to calculating wave drag for modern supersonic aircraft' This new book, by a prolific fluid-dynamicist and mathematician who has published more than twenty research monographs, represents not just another contribution to aerodynamics, but a book that raises serious questions about traditionally accepted approaches and formulations - and provides new methods that solve longstanding problems of importance to the industry. While both conventional and newer ideas are discussed, the presentations are readable and geared to advanced undergraduates with exposure to elementary differential equations and introductory aerodynamics principles. Readers are introduced to fundamental algorithms (with Fortran source code) for basic applications, such as subsonic lifting airfoils, transonic supercritical flows utilizing mixed differencing, models for inviscid shear flow aerodynamics, and so on - models they can extend to include newer effects developed in the second half of the book. Many of the newer methods have appeared over the years in various journals and are now presented with deeper perspective and integration. This book helps readers approach the literature more critically. Rather than simply understanding an approach, for instance, the powerful "type differencing" behind transonic analysis, or the rationale behind "conservative" formulations, or the use of Euler equation methods for shear flow analysis when they are unnecessary, the author guides and motivates the user to ask why and why not and what if. And often, more powerful methods can be developed using no more than simple mathematical manipulations. For example, Cauchy-Riemann conditions, which are powerful tools in subsonic airfoil theory, can be readily extended to handle compressible flows with shocks, rotational flows, and even three-dimensional wing flowfields, in a variety of applications, to produce powerful formulations that address very difficult problems. This breakthrough volume is certainly a "must have" on every engineer's bookshelf.
9781119580850 1119580854 9781119580867 1119580862 9781119581222 1119581222
2019004283
Aerodynamics.
TECHNOLOGY & ENGINEERING--Engineering (General)
Aerodynamics.
Electronic books.
TL570 / .C457 2019
629.132/3
Modern aerodynamic methods for direct and inverse applications / Wilson C. Chin. - 1 online resource
Includes bibliographical references and index.
Cover; Title Page; Copyright Page; Table of Contents; Preface; Acknowledgements; 1 Basic Concepts, Challenges and Methods; 1.1 Governing Equations -- An Unconventional Synopsis; 1.2 Fundamental "Analysis" or "Forward Modeling" Ideas; 1.3 Basic "Inverse" or "Indirect Modeling" Ideas; 1.4 Literature Overview and Modeling Issues; 1.5 References; 2 Computational Methods: Subtleties, Approaches and Algorithms; 2.1 Coding Suggestions and Baseline Solutions; 2.1.1 Presentation Approach; 2.1.2 Programming Exercises; 2.1.3 Model Extensions and Challenges 2.2 Finite Difference Methods for Simple Planar Flows2.2.1 Finite Differences -- Basic Concepts; 2.2.2 Formulating Steady Flow Problems; 2.2.3 Steady Flow Problems; 2.2.4 Wells and Internal Boundaries; 2.2.5 Point Relaxation Methods; 2.2.6 Observations on Relaxation Methods; 2.3 Examples -- Analysis, Direct or Forward Applications; 2.3.1 Example 1 -- Thickness Solution, Centered Slit in Box; 2.3.2 Example 2 -- Half-Space Thickness Solution; 2.3.3 Example 3 -- Centered Symmetric Wedge Flow; 2.3.4 Example 4 -- General Solution with Lift, Centered Slit 2.3.5 Example 5 -- Transonic Supercritical Airfoil with Type-Dependent Differencing Solution, Subsonic, Mixed Flow and Supersonic2.3.6 Example 6 -- Three-Dimensional, Thickness-Only, Finite, Half-Space Solution; 2.4 Examples -- Inverse or Indirect Applications; 2.4.1 Example 1 -- Constant Pressure Specification and Symmetric Thin Ellipse; 2.4.2 Example 2 -- Inverse Problem, Pressure Specification, Centered Slit, Trailing Edge Closed vs Opened; 2.4.3 Example 3 -- Inverse Problem, Pressure Specification, Three-Dimensional Half-Space, Closed Trailing Edge, Nonlifting Symmet 3 Advanced Physical Models and Mathematical Approaches3.1 Nonlinear Formulation for Low-Frequency Transonic Flow; 3.1.1 Introduction; 3.1.2 Analysis; 3.1.3 Discussion and Summary; 3.1.4 References; 3.2 Effect of Frequency in Unsteady Transonic Flow; 3.2.1 Introduction; 3.2.2 Numerical Procedure; 3.2.3 Results; 3.2.4 Concluding Remarks; 3.2.5 References; 3.3 Harmonic Analysis of Unsteady Transonic Flow; 3.3.1 Introduction; 3.3.2 Analytical and Numerical Approach; 3.3.3 Calculated Results; 3.3.4 Discussion and Closing Remarks; 3.3.5 References 3.4 Supersonic Wave Drag for Nonplanar Singularity Distributions3.4.1 Introduction; 3.4.2 Analysis; 3.4.3 Summary; 3.4.4 References; 3.5 Supersonic Wave Drag for Planar Singularity Distributions; 3.5.1 Introduction; 3.5.2 Analysis; 3.5.3 Concluding Remarks; 3.5.4 References; 3.6 Pseudo-Transonic Equation with a Diffusion Term; 3.6.1 Introduction; 3.6.2 Analysis; 3.6.3 Summary; 3.6.4 References; 3.7 Numerical Solution for Viscous Transonic Flow; 3.7.1 Introduction; 3.7.2 Analysis; 3.7.3 Numerical Approach; 3.7.4 Sample Calculation; 3.7.5 Discussion; 3.7.6 References
Just when classic subject areas seem understood, the author, a Caltech, M.I.T. and Boeing trained aerodynamicist, raises profound questions over traditional formulations. Can shear flows be rigorously modeled using simpler "potential-like" methods versus Euler equation approaches' Why not solve aerodynamic inverse problems using rapid, direct or forward methods similar to those used to calculate pressures over specified airfoils' Can transonic supercritical flows be solved rigorously without type-differencing methods' How do oscillations affect transonic mean flows, which in turn influence oscillatory effects' Or how do hydrodynamic disturbances stabilize or destabilize mean shear flows' Is there an exact approach to calculating wave drag for modern supersonic aircraft' This new book, by a prolific fluid-dynamicist and mathematician who has published more than twenty research monographs, represents not just another contribution to aerodynamics, but a book that raises serious questions about traditionally accepted approaches and formulations - and provides new methods that solve longstanding problems of importance to the industry. While both conventional and newer ideas are discussed, the presentations are readable and geared to advanced undergraduates with exposure to elementary differential equations and introductory aerodynamics principles. Readers are introduced to fundamental algorithms (with Fortran source code) for basic applications, such as subsonic lifting airfoils, transonic supercritical flows utilizing mixed differencing, models for inviscid shear flow aerodynamics, and so on - models they can extend to include newer effects developed in the second half of the book. Many of the newer methods have appeared over the years in various journals and are now presented with deeper perspective and integration. This book helps readers approach the literature more critically. Rather than simply understanding an approach, for instance, the powerful "type differencing" behind transonic analysis, or the rationale behind "conservative" formulations, or the use of Euler equation methods for shear flow analysis when they are unnecessary, the author guides and motivates the user to ask why and why not and what if. And often, more powerful methods can be developed using no more than simple mathematical manipulations. For example, Cauchy-Riemann conditions, which are powerful tools in subsonic airfoil theory, can be readily extended to handle compressible flows with shocks, rotational flows, and even three-dimensional wing flowfields, in a variety of applications, to produce powerful formulations that address very difficult problems. This breakthrough volume is certainly a "must have" on every engineer's bookshelf.
9781119580850 1119580854 9781119580867 1119580862 9781119581222 1119581222
2019004283
Aerodynamics.
TECHNOLOGY & ENGINEERING--Engineering (General)
Aerodynamics.
Electronic books.
TL570 / .C457 2019
629.132/3