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Subsections



Numerical simulation of Direct Methanol Fuel Cells

Collaborator: J. Fuhrmann, K. Gärtner

Cooperation with: J. Bloch (Freie Universität Berlin (FU-FZT 86))

Supported by: DFG-Forschungszentrum ``Mathematik für Schlüsseltechnologien'' (Research Center ``Mathematics for Key Technologies'' (FZT 86)), project C1

Description: The project has been continued with the following focuses:


Improvement of the solver kernel

The corresponding work is closely related to the pdelib2   project. The aim is to be able to handle efficiently calculations in the two- and three-dimensional cases.


Fig. 1: Three-dimensional simulation results for an elementary cell in the case of crossing diffusion channels.
Top: methanol concentration (mol/l), bottom: water pressure (bar) and proton potential (V)
\makeatletter
\@DreiProjektbilderNocap[d]{0.5\textwidth}{ch3oh3d.eps}{h2o3d.eps}{hplus3d.eps}
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Development of tools for bifurcation analysis

In close cooperation with project C1 of the DFG Research Center we started the development of tools for path-following and bifurcation detection for systems of partial differential equations. Once available, this tool shall help to understand under which conditions a fuel cell can have several steady states.

Currently, we are able to handle sufficiently well model problems like the Brusselator equations.



Fig. 2: Bifurcation diagram of a 1D Brusselator system in dependency of the reactor length $ \lambda$
\ProjektEPSbildNocap{0.5\textwidth}{bruss.eps}


Project presentation

We have been able to present our results at the Computational Fuel Cell Dynamics II workshop in Banff, Canada, and--jointly with the Micro fuel cell group of Fraunhofer IZM Berlin--at the H2 Expo 2003 fair in Hamburg.

References:

  1. J. DIVISEK, J.FUHRMANN, K. GÄRTNER, R. JUNG, Performance modeling of a Direct Methanol Fuel Cell, J. Electrochem. Soc., 150 (2003), pp. A811-A825.



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2004-08-13