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Introduction to Numerical Methods for Time Dependent Differential Equations,9781118838952
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Introduction to Numerical Methods for Time Dependent Differential Equations



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This is the edition with a publication date of 4/7/2014.

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This introductory, self-contained book emphasizes both the fundamentals of time-dependent differential equations and the numerical solutions of these equations.

The book is divided into two parts: Part One deals with ordinary differential equations (ODE) and their approximations. Part Two addresses partial differential equations in one space dimension and their approximations.   

Topical coverages includes: first order scalar equations; the method of Euler; higher order methods; the implicit Euler methods, two step and multistep methods; systems of differential equations; Fourier series and interpolation; 1-periodic solutions; approximations of 1-periodic solutions; linear initial-boundary value problems; and nonlinear problems.

Introduction to Numerical Methods for Time Dependent Differential Equations:

  • Provides topical coverage in a very simplified manner and only in a one space dimension
  • Presents the analytic theory and translates it into a theory for difference approximations
  • Contains worked out solutions to select answers at the end of the book
  • Offers an Instructor's Solution Manual containing the complete solutions (available via written request to the Publisher)
  • Classroom-tested and based on course notes used at both UCLA and the National University of Cordoba

Table of Contents

Preface xiii

Acknowledgments xv


1 First Order Scalar Equations 3

1.1 Constant coefficient linear equations 3

1.1.1 Duhamel’s principle 8

1.1.2 Principle of frozen coefficients 10

1.2 Variable coefficient linear equations 10

1.2.1 The principle of superposition 10

1.2.2 Duhamel’s principle for variable coefficients 12

1.3 Perturbations and the concept of stability 13

1.4 Nonlinear equations: the possibility of blowup 17

1.5 The principle of linearization 20

2 The Method of Euler 23

2.1 The explicit Euler method 23

2.2 Stability of the explicit Euler method 25

2.3 Accuracy and truncation error 27

2.4 Discrete Duhamel’s principle and global error 28

2.5 General onestep methods. 31

2.6 How to test the correctness of a program 32

2.7 Extrapolation 34

3 Higher Order Methods 37

3.1 The secondorder Taylor method 37

3.2 Improved Euler’s method 39

3.3 Accuracy of the computed solution 40

3.4 RungeKutta methods 44

3.5 Regions of stability 48

3.6 Accuracy and truncation error 51

3.7 Difference approximations for unstable problems 52

4 The Implicit Euler Method 55

4.1 Stiff equations 55

4.2 The implicit Euler method 58

4.3 A simple variable step size strategy 63

5 Two Step and Multistep Methods 67

5.1 Multistep methods 67

5.2 The leapfrog method 68

5.3 Adams methods 72

5.4 Stability of multistep methods 74

6 Systems of Differential Equations 77


7 Fourier Series and Interpolation 83

7.1 Fourier expansion 83

7.2 The L2norm and scalar product 89

7.3 Fourier interpolation 92

7.3.1 Scalar product and norm for 1periodic grid functions 93

8 1periodic Solutions of Time Dependent PDE... 95

8.1 Examples of equations with simple wave solutions 95

8.1.1 The oneway wave equation 95

8.1.2 The heat equation 96

8.1.3 The wave equation 97

8.2 Discussion of well posed problems for time dependent PDE... 98

8.2.1 First order equations 98

8.2.2 Second order (in space) equations 100

8.2.3 General equation 101

8.2.4 Stability against lower order terms and systems of equations 102

9 Approximations of 1periodic Solutions of PDE 105

9.1 Approximations of space derivatives 105

9.1.1 Smoothness of the Fourier interpolant 108

9.2 Differentiation of Periodic Functions 109

9.3 The method of lines 110

9.3.1 The oneway wave equation 110

9.3.2 The heat equation 113

9.3.3 The wave equation 115

9.4 Time Discretizations and Stability Analysis 116

10 Linear InitialBoundary Value Problems 119

10.1 Well Posed InitialBoundary Value Problems 119

10.1.1 The heat equation on a strip 120

10.1.2 The oneway wave equation on a strip 122

10.1.3 The wave equation on a strip 124

10.2 The method of lines 126

10.2.1 The heat equation 126

10.2.2 Finite differences algebra 130

10.2.3 General parabolic problem 131

10.2.4 The oneway wave equation 134

10.2.5 The wave equation 135

11 Nonlinear Problems 137

11.1 Initialvalue problems for ODE 138

11.2 Existence theorems for nonlinear PDE 141

11.3 A nonlinear example: Burgers’ equation 145

A Auxiliary Material 149

A.1 Some useful Taylor series 149

A.2 The “O” notation 150

A.3 The solution expansion 150

B Solutions to Exercises 153

References 171

Index 173

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