Assessment of subgrid interpolation for the source term evaluation within premixed combustion simulations

Assessment of subgrid interpolation for the source term evaluation within premixed combustion simulations
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预混燃烧模拟中源项评估的子网格插值评估

DOI:
10.1016/j.combustflame.2016.12.016
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发表时间:
2017
影响因子:
4.4
通讯作者:
Janicka
Janicka
中科院分区:
工程技术2区
文献类型:
--
作者:
Kuenne;Avdić;Janicka

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为了减小化学源项数值计算的误差,采用了基于离散单元中心标量的空间插值方法。这样,他们的子网格的演变是近似的,这是一个更准确的评估的源项依赖于传输标量的非线性是主要的误差原因。进行了详细的分析,以评估这种方法的预混燃烧模拟的背景下。除了先验分析,一维火焰传播以及二维火焰涡流相互作用的模拟被用来量化增益相对于计算的火焰速度和预测的火焰动力学的相应的准确性。对于实际应用中的应用程序,它演示了如何将该方法与人工加厚火焰模型相结合,用于大涡模拟。这包括理论推导,简单的测试案例进行详细的验证和评估,最后模拟湍流旋流燃烧器,其中也解决了计算效率。
In order to reduce the error within the numerical evaluation of the chemical source term, spatial interpolation based on the discrete cell centered scalar quantities is applied. By that, their subgrid evolution is approximated which serves for a more accurate evaluation of the source terms dependency on transported scalars whose non-linearity is the major cause of errors. A detailed analysis is performed to assess this approach within the context of premixed combustion simulations. Besides an a priori analysis, simulations of one-dimensional flame propagation as well as two-dimensional flame–vortex-interactions are used to quantify the gain with respect to the computed flame speed and the corresponding accuracy of the predicted flame dynamics. For the application within realistic applications it is demonstrated how the method can be combined with the artificially thickened flame model for large eddy simulations. This includes the theoretical derivation, simple testcases for a detailed verification and assessment, and finally the simulations of a turbulent swirl burner, where also the computational efficiency is addressed.
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