Stabilization of DAEs and invariant manifolds
- Many methods have been proposed for the stabilization of higher index differential-algebraic equations (DAEs). Such methods often involve constraint differentiation and problem stabilization, thus obtaining a stabilized index reduction. A popular method is Baumgarte stabilization, but the choice of parameters to make it robust is unclear in practice. Here we explain why the Baumgarte method may run into trouble. We then show how to improve it. We further develop a unifying theory for stabilization methods which includes many of the various techniques proposed in the literature. Our approach is to (i) consider stabilization of ODEs with invariants, (ii) discretize the stabilizing term in a simple way, generally different from the ODE discretization, and (iii) use orthogonal projections whenever possible. The best methods thus obtained are related to methods of coordinate projection. We discuss them and make concrete algorithmic suggestions.
|Author:||Uri M. Ascher, Hongsheng Chin, Sebastian Reich|
|Series (Serial Number):||Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, ISSN 1866-8372 (paper 030)|
|Date of Publication (online):||2007/11/16|
|Year of Completion:||1994|
|Publishing Institution:||Universität Potsdam|
|Organizational units:||Mathematisch-Naturwissenschaftliche Fakultät / Institut für Mathematik|
|Extern / Extern|
|Dewey Decimal Classification:||5 Naturwissenschaften und Mathematik / 51 Mathematik / 510 Mathematik|
ﬁrst published in:
Numerische Mathematik - 67 (1994), 2, p. 131-149
The original publication is available at www.springerlink.com.