A mixing model for turbulent flows based on parameterized scalar profiles
A mixing model for turbulent flows based on parameterized scalar profiles
复制标题
基于参数化标量轮廓的湍流混合模型
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Jenny
中科院分区：
文献类型：
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作者：
D. Meyer;P. Jenny
本文用概率密度函数方法研究了湍流反应流中分子混合的封闭性。可以肯定地说，缺乏一个通用的和准确的混合模型是湍流燃烧模拟的不确定性的主要来源。在这里，我们提出了一个模型的基础上构建一维标量分布的统计分布，即，流体粒子与参数化标量轮廓（PSP）相关联。与以前的方法相反，PSP模型的结果是一个简单的公式，并能够以较低的计算成本产生非常准确的结果。为了验证，在均匀各向同性湍流中的两个标量混合问题。通过与直接数值模拟数据的比较，证明了PSP模型的准确性，并证实了内在的物理假设是合理的。
In this paper the closure of molecular mixing in turbulent reactive flows is addressed in the context of probability density function methods. It is safe to say that the lack of a general and accurate mixing model is a major source for uncertainties in turbulent combustion simulation. Here, we propose a model based on constructing statistical distributions of one-dimensional scalar profiles, i.e., fluid particles are associated to parameterized scalar profiles (PSP). Opposed to previous approaches, the PSP model results in a simple formulation and is able to produce very accurate results at low computational cost. For validation, a two-scalar mixing problem in homogeneous isotropic turbulence was used. The accuracy of the PSP model was demonstrated by comparison with direct numerical simulation data and confirms that the intrinsic physical assumptions are justified.