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A Few Illustrative Examples of CFD-based Optimization

Heat Exchanger, Laminar Burner and Turbulence Modeling

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Optimization and Computational Fluid Dynamics

Abstract

In this chapter, several multi-objective design optimizations are performed in order to illustrate major issues associated with CFD-based optimization. First, a heat exchanger configuration (Case A) is considered using the coupled solution of the flow/heat transfer processes. The aim of the procedure is to find the positions of the tubes most favorable to simultaneously maximize heat exchange while obtaining a minimum pressure loss.

Next, the optimization of the flame shape of a laminar burner is investigated when varying the fuel/air ratio in a primary and a secondary inlet (Case B). The objectives are to reduce the CO emission at a prescribed distance from the injection plane and to obtain the most homogeneous temperature profile at the same position. The flow involving chemical reactions is solved using the in-house Computational Fluid Dynamics (CFD) code UGC +. These two cases are the continuation of our previous studies, introducing new results and new aspects.

The last case presented here is a new proposal to optimize the model parameters of an engineering turbulence model (Case C).

In all the presented cases, an Evolutionary Algorithm (EA) is applied to find the optimal configurations. An in-house computer package, called Opal, performs the optimization process in a fully automatic manner. The EA relies on a relatively large number of simulations which may result in a considerable computational effort, depending on the configuration. The procedure can thus be performed in parallel on a Linux PC-cluster to reduce user waiting time.

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  1. Lab. of Fluid Dynamics and Technical Flows, University of Magdeburg “Otto von Guericke”, Germany

    Gábor Janiga

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  1. Institut für Strömungstechnik und Thermodynamik (ISUT), Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany

    Dominique Thévenin  & Gábor Janiga  & 

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Janiga, G. (2008). A Few Illustrative Examples of CFD-based Optimization. In: Thévenin, D., Janiga, G. (eds) Optimization and Computational Fluid Dynamics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72153-6_2

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  • DOI: https://doi.org/10.1007/978-3-540-72153-6_2

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