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Article

Direct numerical simulation of a turbulent reacting wall-jet

Authors: Pouransari, Z., Brethouwer, G.B., Johansson, A.V.J.
Document Type: Conference
Pubstate: Published
Journal: Direct and Large-Eddy Simulation VIII
Volume: 15   345-350
Year: 2010

Abstract

The turbulent wall-jet includes a number of interesting fluid mechanics phenomena with close resemblance to many mixing and combustion applications. During the last decades, both direct numerical simulation (DNS) [1] and [2], and large-eddy simulation (LES) [3], have been used to study the turbulent wall-jet. Ahlman et al. (2009) performed DNS of non-isothermal turbulent wall jets. Earlier in 2007, Ahlman et al. investigated turbulent statistics and mixing of a passive scalar for an isothermal case by means of DNS. The first three-dimensional DNS of a reacting turbulent flow was performed by Riley et al. (1986) where they simulated a single reaction of two scalars, without heat release, for a mixing layer. Recently, Knaus et al. (2009) studied the effect of heat release in non-premixed reacting shear layers [4]. In the present investigation, DNS is used to study a simple reaction in a plane turbulent wall-jet. The flow is compressible and involves a single step reaction be- tween an oxidizer and a fuel species. At the inlet, fuel and oxidizer enter the domain separately in a non-premixed manner. The reaction is temperature independent and does not release heat. Since the flow is uncoupled from the reaction, the influence of turbulent mixing on the reaction can be studied in the absence of temperature effects. Statistics of the downstream development and reaction of the oxidizer and fuel are studied and compared to the statistics of a passive scalar in the non-reacting wall-jet, [1].