Numerical Simulation of Turbulent Combustion with a Multi-Regional Approach

Numerical Simulation of Turbulent Combustion with a Multi-Regional Approach
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多区域方法的湍流燃烧数值模拟

DOI:
10.1007/978-3-319-24633-8_18
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
H. Bockhorn
H. Bockhorn
中科院分区:
--
文献类型:
--
作者:
F. Zhang;T. Zirwes;P. Habisreuther;H. Bockhorn

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目前的工作采用多区域方法来提高大规模燃烧模拟的计算性能。用这种方法,将燃烧器内等温流的溶液与燃烧反应区分开处理。对于喷嘴内的新鲜气体流动,只求解了非反应性固定成分流动的Navier-Stokes方程,而在燃烧器下游的点火区启用了考虑化学反应的燃烧模型。由于化学解决方案占用了总计算时间的很大一部分,因此该方法为位于喷嘴内的计算节点节省了部分执行时间,因为喷嘴内不会发生化学反应。在目前的研究中,该方法的潜力已通过大涡模拟(LES)燃烧器模型运行的预混甲烷/空气火焰进行了评估。多区域模拟结果与常规单区域计算结果一致。然而,它已被证明比可比的单区域LES快得多,这表明计算性能有所提高。
The current work uses a multi-regional method for improving the computing performance of large-scale combustion simulations. In this manner, the solution of the isothermal flow within the burner is treated separately from the domain with combustion reaction. For the fresh gas flow within the nozzle only the Navier-Stokes equations for a non-reactive, fixed composition flow are solved, whereas the combustion model accounting for the chemical reactions is enabled in the ignition zone downstream of the burner. Because the chemistry solution takes a major part of the total computing time, the approach saves that part of execution time for the computing nodes located within the nozzle, where no chemical reaction occurs. In the present study, the potential of this methodology has been assessed by large eddy simulation (LES) of a model burner operated with a premixed methane/air flame. The multi-regional simulation showed consistent results with data obtained from the conventional single-regional computation. It however has been proven to be considerably faster than the comparable single-zonal LES, denoting an improved computing performance.
DOI: 10.1016/j.cma.2010.07.015
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