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Introduction to direct variational and moment methods and an application to the Child–Langmuir law
University of Borås, Faculty of Textiles, Engineering and Business.
2015 (English)In: European journal of physics, ISSN 0143-0807, E-ISSN 1361-6404, Vol. 36, no 6Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 36, no 6
Keyword [en]
direct variational methods, moment methods, Child-Langmuir law
National Category
Mathematics
Identifiers
URN: urn:nbn:se:hb:diva-769DOI: 10.1088/0143-0807/36/6/065032OAI: oai:DiVA.org:hb-769DiVA: diva2:854561
Available from: 2015-09-17 Created: 2015-09-17 Last updated: 2017-05-02

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