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Fourier Transform Methods for PDEs
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Maxwell's equations in free space
Fourier transform Maxwell's equations, solve the system of ODEs for the electric and magnetic fields, and apply inverse Fourier transforms to find the fields in real space.
Inhomogeneous Helmholtz equation
Fourier transform the Helmholtz equation, solve the resulting equation in the Fourier domain, then find the solution via inverse Fourier transform.
Diffusion equation with source term
Fourier transform the diffusion equation, incorporate the source term in the transformed domain, solve for the transformed solution, and inverse Fourier transform.
Laplace's equation in the frequency domain
Fourier transform Laplace's equation, solve the algebraic equations, then apply the inverse Fourier transform to obtain the solution in the spatial domain.
Heat equation using Fourier transform
Apply Fourier transform to both sides, solve the resulting ODE, apply inverse Fourier transform to find the solution.
Korteweg-de Vries (KdV) equation
Apply Fourier transform to the KdV equation, solve the resulting nonlinear ODE, use inverse scattering transform if needed, then inverse Fourier transform to real space.
Poisson's equation for electrostatics
Apply the Fourier transform to both sides of Poisson's equation, solve the resulting algebraic equation in Fourier space, then inverse Fourier transform to get the potential field.
Wave equation with Fourier transform
Fourier transform the equation, find general solutions to the resulting ODEs, use initial conditions to find specific solutions, inverse Fourier transform back.
Schrodinger's equation in an infinite potential well
Fourier transform Schrodinger's equation, solve the resulting ODE with given potential, and apply boundary conditions after inverse Fourier transforming.
Burgers' equation with viscosity
Apply the Fourier transform to Burgers' equation, employ the Cole-Hopf transformation to linearize, solve the ODE, then invert to real space.
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