Introduction to direct variational and moment methods and an application to the Child-Langmuir law
Journal article, 2015
A short introduction is given of direct variational methods and its relation to Galerkin and moment methods, all flexible and powerful approaches for finding approximate solutions of difficult physical equations. A pedagogical
application of moment methods is given to the physically and technically important Child–Langmuir law in electron physics. The analysis is shown to provide simple, yet accurate, approximate solutions of the two-dimensional
problem (a problem which does not allow an exact analytical solution)and illustrates the usefulness and the power of moment methods.
direct variational methods