Improved Boundary Conditions for the DNS of Reacting Subsonic Flows

Improved Boundary Conditions for the DNS of Reacting Subsonic Flows
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反应亚音速流 DNS 的改进边界条件

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发表时间：
2011
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通讯作者：
R. Prosser
R. Prosser
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文献类型：
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作者：
R. Prosser

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本文发展了一种确定反应流时间相关边界条件的方法。该方法建立在较早的结果，并从一个基本状态的流场的线性化。用流膨胀来描述基态，并建立了低马赫数反应流膨胀的一般表达式。然后，该表达式用于导出透声边界条件。该方法的实用性证明通过一些层流火焰计算，范围从单步化学的多步甲烷机制的复杂性。所得到的解决方案的准确性被认为是上级使用其他手段获得的。
In this paper, we develop a method of prescribing time dependent boundary conditions for reacting flows. The method builds on earlier results, and derives from a linearization of the flow field around a base state. The base state is specified in terms of the flow dilatation, and we establish a general expression for the dilatation in reacting flows at low Mach number. This expression is then used to derive acoustically transparent boundary conditions. The utility of the approach is demonstrated via a number of laminar flame calculations, ranging in complexity from single step chemistry to a multi-step methane mechanism. The accuracy of the resulting solutions is found to be superior to those obtained using other means.