15. Fourier Series Solutions to PDEs
The Fourier Series technique is essential in solving Partial Differential Equations (PDEs), particularly for scenarios involving heat flow, vibrations, and potential theory. This method transforms PDEs into solvable ordinary differential equations (ODEs) using an infinite series of sine and cosine functions. By leveraging orthogonality and convergence under Dirichlet conditions, the Fourier Series allows for practical applications in various engineering and physics problems.
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What we have learnt
- The Fourier series can express a periodic function as a sum of sine and cosine functions.
- This method allows the transformation of PDEs into simpler ODEs, making them easier to solve.
- Critical conditions must be met for Fourier series expansion, such as the function being periodic and piecewise continuous.
Key Concepts
- -- Fourier Series
- A representation of a periodic function as an infinite sum of sine and cosine functions.
- -- Partial Differential Equations (PDEs)
- Equations involving partial derivatives of a function with respect to multiple variables, crucial in modeling physical phenomena.
- -- Dirichlet Conditions
- A set of conditions necessary for the convergence of Fourier series, including periodicity, piecewise continuity, and limited discontinuities.
- -- Separation of Variables
- A mathematical method used to simplify PDEs by assuming the solution can be expressed as the product of functions, each dependent on a single variable.
- -- Boundary Value Problems
- Problems that seek to find a solution to PDEs subject to specific conditions on the boundaries of the domain.
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