Title: A method for reduction of computational time of local equilibria for biomass flue gas compositions in CFD

Authors: Markus Braun, Stefan Kleditzsch, Robert Scharler, Ingwald Obernberger, Martin Forstner, Markus Joller, Georg Hofmeister

Addresses: Fluent Deutschland GmbH, Birkenweg 14a, D-64295 Darmstadt, Germany. ' Fluent Deutschland GmbH, Birkenweg 14a, D-64295 Darmstadt, Germany. ' Austrian Bioenergy Centre GmbH, Inffeldgasse 21 b, 8010 Graz, Austria; Graz University of Technology, Institute for Ressource Efficient and Sustainable Systems, Inffeldgasse 21 b, 8010 Graz, Austria; BIOS BIOENERGIESYSTEME GmbH, Inffeldgasse 21 b, 8010 Graz, Austria. ' Austrian Bioenergy Centre GmbH, Inffeldgasse 21 b, 8010 Graz, Austria; Graz University of Technology, Institute for Ressource Efficient and Sustainable Systems, Inffeldgasse 21 b, 8010 Graz, Austria; Technical University of Eindhoven, Department of Mechanical Engineering, Section Process Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, the Netherlands; BIOS BIOENERGIESYSTEME GmbH, Inffeldgasse 21 b, 8010 Graz, Austria. ' Austrian Bioenergy Centre GmbH, Inffeldgasse 21b, A-8010 Graz, Austria. ' Austrian Bioenergy Centre GmbH, Inffeldgasse 21b, A-8010 Graz, Austria. ' Austrian Bioenergy Centre GmbH, Inffeldgasse 21b, A-8010 Graz, Austria

Abstract: In situ adaptive tabulation has been used to store equilibria states in a tree-like structure to be used in prediction of local condensation rates in CFD simulations of heat exchanger tubes. An interface to several tools to compute chemical equilibrium in flue gas compositions was developed. The results show a reduction of computation times at least by a factor of 8 (Table 4). Relative tolerances of 10−4 are sufficient to interpolate the table. Simulations indicate that mesh resolution is more important than a smaller tolerance.

Keywords: computational fluid dynamics; CFD; biomass combustion; multi-phase equilibrium; condensation; flue gas; in-situ adaptive tabulation.

DOI: 10.1504/PCFD.2006.010036

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.4/5, pp.272 - 277

Published online: 09 Jun 2006 *

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