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Saskia Bublitz, M.Sc.

Lupe

Research assistant (with teaching duties)

KWT-A 111

Tel.: +49 30 314 70448

Fax: +49 30 314 123 70448

Researchgate

Office hours: All in-person office hours are postponed for now. Separate arrangements can be made by email.

Focus of my research:

Lupe

Analysis of how to efficiently solve large nonlinear algebraic equation systems by the use of:

  • Initialization methods (Interval arithmetic, Sampling, Multi-Start, see Figure above)
  • Preconditioning (Scaling, System decomposition, Equation reformulations)
  • Process parallelization
  • Debugging strategies

Further activities:

Lupe

Publications & Talks:

Publications

Analysis and Decomposition for Improved Convergence of Nonlinear Process Models in Chemical Engineering
Citation key Bublitz2017
Author Saskia Bublitz and Erik Esche and Gregor Tolksdorf and Volker Mehrmann and Jens-Uwe Repke
Pages 1503–1514
Year 2017
DOI 10.1002/cite.201700041
Journal Chemie Ingenieur Technik
Volume 89
Number 11
Month oct
Publisher Wiley
Abstract Abstract Solving nonlinear equation systems as they occur in process simulation simultaneously, often fails due to ill?conditioned models or bad initialization. To counteract these issues two methods have been implemented in the web?based platform MOSAICmodeling. The Dulmage?Mendelsohn algorithm forms a block diagonal Jacobian matrix. In addition, the bordered block transformation identifies variables that need to be carefully initialized due to their great influence on the system. Both methods are applied on two process models and their convergence and sensitivity towards initialization is analyzed.
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