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In a low-Mach-number counterflow geometry, steadily propagating twin and triple flames are investigated. A complete numerical model of such flames is presented including a Galilean-like transformation to achieve steadiness of the flames in a moving frame of reference. The model is based on a similarity transformation of the fundamental conservation Equations in primitive variables, which transforms the inherently three-dimentional problem to two space dimensions. Suitable boundary conditions are derived employing potential theory. The governing Equations are discretized by a finite element method on an unstructured triangulized grid. Employing a local adaptive mesh-refinement procedure, for H 2 -O 2 systems with both a global one-step model and a detailed mechanism of elementary reactions, numerical solutions have been obtained.
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Keywords: Galilean transformation; chemically reactive flow; counterflow; finite elements; laminar flame; numerical simulation; triple flame; twin flame

Document Type: Research Article

Affiliations: Lehrstuhl für Strömungsmechanik, Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, Bochum, Germany

Publication date: May 1, 2005

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