Introduction to direct variational and moment methods and an application to the Child-Langmuir law
Artikel i vetenskaplig tidskrift, 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

moment methods

Child–Langmuir law

Författare

Dan Anderson

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

Mats Desaix

Högskolan i Borås

European Journal of Physics

0143-0807 (ISSN)

Vol. 2015 065032-

Fundament

Grundläggande vetenskaper

Lärande och undervisning

Pedagogiskt arbete

Ämneskategorier

Fusion, plasma och rymdfysik

Matematisk analys

DOI

10.1088/0143-0807/36/6/065032