• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >A probability density function Eulerian Monte Carlo field method for large eddy simulations: Application to a turbulent piloted methane/air diffusion flame (Sandia D)
【2h】

A probability density function Eulerian Monte Carlo field method for large eddy simulations: Application to a turbulent piloted methane/air diffusion flame (Sandia D)

机译：大型涡模拟的概率密度函数欧拉蒙特卡洛场法：在湍流的甲烷/空气扩散火焰（Sandia D）中的应用

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Eulerian stochastic field method is applied to the solution of the modeled evolution equation for the subgrid joint probability density function (JPDF) of the reacting scalars in a large eddy simulation (LES) of a piloted methane/air diffusion flame (Sandia Flame D). A simple model for subgrid scale (SGS) stresses and fluxes and a global four-step mechanism for combustion are combined in the formulation. Test cases with varying mesh sizes and numbers of stochastic fields were completed. The differences in the results obtained with the two grids were very small and this indicates that the mesh resolution was sufficient. However, incorporation of the JPDF, via the stochastic field solution method, improved the quality of predictions significantly, particularly those quantities related to reaction, such as temperature. Eight stochastic fields were shown to be enough to characterize the influence of SGS fluctuations on filtered species formation rate to reasonable accuracy and at moderate computational cost. With the exceptions of H2 and CO, good agreement between measured and computed mean and RMS profiles of velocity, composition, and temperature was achieved. The discrepancies in H2 and CO concentrations are attributable to limitations in the global chemistry mechanism used in the LES. Overall the results serve to highlight the potential of the Eulerian stochastic field method in LES. © 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在试点甲烷/空气扩散火焰（Sandia Flame D）的大涡模拟（LES）中，将欧拉随机场方法应用于反应标量的亚网格联合概率密度函数（JPDF）的模型演化方程的求解。在公式中结合了一个简单的亚网格尺度（SGS）应力和通量模型以及一个全局的四步燃烧机理。完成了具有不同网格大小和随机场数的测试用例。使用两个网格获得的结果差异非常小，这表明网格分辨率已足够。但是，通过随机场求解方法合并JPDF可以显着提高预测的质量，尤其是与反应有关的量，例如温度。结果表明，八个随机场足以表征SGS波动对过滤后的物种形成速率的影响，使其具有合理的准确度和适度的计算成本。除氢气和一氧化碳外，速度，成分和温度的实测值和计算值与均方根值之间均具有良好的一致性。 H2和CO浓度的差异归因于LES中使用的全局化学机制的局限性。总体而言，结果有助于突出LES中欧拉随机场方法的潜力。 ©2006，燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号