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Numerical simulations of a second-order chemical reaction in a plane turbulent channel flow

机译:平面湍流通道中二阶化学反应的数值模拟

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摘要

We analyze numerical simulations of a second-order chemical reaction (Da = 1) in a fully developed turbulent plane channel flow at a low Reynolds number (Re_τ = 180). The reactive plume is formed when a reactant A is released through a line source into the channel flow doped with reactant B. Two different inlet pre-mixing conditions and line source heights are considered. Direct Numerical Simulations (DNS) and Stochastic Fields (SF) methods have been used and compared for these different conditions. The results obtained using SF are sensitive to the particular value of the turbulent Schmidt number (Sc_τ) selected to model the turbulent dispersion. It has been found that if a representative value of Sc_τ extracted from DNS is used in the SF method, both DNS and SF, give similar results.
机译:我们分析了在低雷诺数(Re_τ= 180)下完全发展的湍流平面通道流中的二级化学反应(Da = 1)的数值模拟。当反应物A通过线源释放到掺杂有反应物B的通道流中时,形成反应羽。考虑了两种不同的入口预混合条件和线源高度。直接数值模拟(DNS)和随机场(SF)方法已被使用,并针对这些不同条件进行了比较。使用SF获得的结果对选择为湍流弥散建模的湍流施密特数(Sc_τ)的特定值敏感。已经发现,如果在SF方法中使用从DNS提取的Sc_τ的代表值,则DNS和SF都给出相似的结果。

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