Print Email Facebook Twitter Non reflecting boundary conditions for reacting flows Part of: ECCOMAS CFD 2006: Proceedings of the European Conference on Computational Fluid Dynamics· list the conference papers Title Non reflecting boundary conditions for reacting flows Author Prosser, R. Date 2006-09-07 Abstract In this paper we explore the specification of time dependent boundary conditions suitable for the simulation of low Mach number reacting flows. The standard treatments used to date are based on the method of characteristics, and essentially set to zero the incoming characteristics; this practise has been shown to have deleterious effects on the flow evolution. The new approach, while still based on the method of characteristics, circumvents this problem through the application of a double expansion in terms of an appropriately defined Mach number. In the method, a low Mach number expansion of the dependent variables is coupled to a two-length scale decomposition. Through the double expansion, it is possible to separate inertial events (i.e. those moving at the local convection velocity) from acoustic events (those moving at the local sound speed). The paper highlights why previous treatments have encountered difficulties in turbulent flows, and provides a method by which heat release effects can be incorporated into a non-reflecting boundary condition framework. The accuracy of the method is demonstrated using a curved stagnating flame, in which the reaction zone crosses the boundary. Subject characteristicsturbulenceboundary conditions To reference this document use: http://resolver.tudelft.nl/uuid:39a5176c-4f4b-4fa9-8589-5fe7c7279544 Part of collection Conference proceedings Document type conference paper Rights (c) 2006 Prosser, R. Files PDF Prosser.pdf 501.64 KB Close viewer /islandora/object/uuid:39a5176c-4f4b-4fa9-8589-5fe7c7279544/datastream/OBJ/view