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A spectral method in time for initial-value problems
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-6379-1880
2012 (English)In: American Journal of Computational Mathematics, ISSN 2161-1211, Vol. 2, no 3, 173-193 p.Article in journal (Refereed) Published
Abstract [en]

A time-spectral method for solution of initial value partial differential equations is outlined. Multivariate Chebyshev series are used to represent all temporal, spatial and physical parameter domains in this generalized weighted residual method (GWRM). The approximate solutions obtained are thus analytical, finite order multivariate polynomials. The method avoids time step limitations. To determine the spectral coefficients, a system of algebraic equations is solved iteratively. A root solver, with excellent global convergence properties, has been developed. Accuracy and efficiency are controlled by the number of included Chebyshev modes and by use of temporal and spatial subdomains. As examples of advanced application, stability problems within ideal and resistive magnetohydrodynamics (MHD) are solved. To introduce the method, solutions to a stiff ordinary differential equation are demonstrated and discussed. Subsequently, the GWRM is applied to the Burger and forced wave equations. Comparisons with the explicit Lax-Wendroff and implicit Crank-Nicolson finite difference methods show that the method is accurate and efficient. Thus the method shows potential for advanced initial value problems in fluid mechanics and MHD.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2012. Vol. 2, no 3, 173-193 p.
Keyword [en]
initial-value problem, WRM, time-spectral, spectral method, Chebyshev polynomial, fluid mechanics, MHD
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-91442DOI: 10.4236/ajcm.2012.23023OAI: oai:DiVA.org:kth-91442DiVA: diva2:510273
Note

QC 20121127

Available from: 2012-11-27 Created: 2012-03-15 Last updated: 2012-11-27Bibliographically approved

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Time-spectral(1125 kB)553 downloads
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Scheffel, Jan

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