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Conditional dynamic subfilter modeling

机译:条件动态亚滤板建模

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摘要

A novel "conditional" variation of the dynamic approach for modeling of large eddy simulation subfilter terms is derived and tested. In contrast to the traditional dynamic closure, which stabilizes "raw" dynamic coefficients by averaging across ensembles of expected statistical homogeneity, the novel variation averages conditionally on some set of scalars whose local values are expected to correlate with the local degree of turbulence. Simulations of a nonpremixed jet flame show that the conditional dynamic model is both tractable and stable and produces predictions which are essentially indistinguishable from the traditional dynamic closure, although both models give suboptimal predictions. Future work could potentially improve the predictions of both models-facilitating a fairer comparison-by considering a more uniform or "pancake-like" grid. Published under license by AIP Publishing.
机译:推导出并测试了大型涡仿真亚滤板术语建模动态方法的新颖的“条件”变化。 与传统的动态闭合相比,通过在预期统计均匀性的集合中平均稳定“原始”动态系数,该新颖的变化在某些局部值与局部湍流之间相关的一组标量来定性地平均突出。 仿真的非增速喷射火焰表明,条件动态模型既是发动又稳定,也产生了从传统动态关闭的预测,尽管两个模型都提供了次优化预测。 未来的工作可能会改善两种模型的预测 - 促进更公平的比较 - 考虑更统一或“薄饼”网格。 通过AIP发布在许可证下发布。

著录项

  • 来源
    《Physics of fluids》 |2019年第8期|共10页
  • 作者单位

    Univ British Columbia Dept Mech Engn Vancouver BC V6T 1Z4 Canada;

    Univ British Columbia Dept Mech Engn Vancouver BC V6T 1Z4 Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
  • 关键词

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