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Evaluation of Flame Area Based on Detailed Chemistry DNS of Premixed Turbulent Hydrogen-Air Flames in Different Regimes of Combustion

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Abstract

Precise evaluation of flame surface area plays a pivotal role in the fundamental understanding and accurate modelling of turbulent premixed flames. This necessity is reflected in the requirement for the instantaneous flame area evaluation of the turbulent burning velocity (by making use of Damköhler’s first hypothesis). Moreover, the information regarding flame area is required in the context of flame surface density based modelling, and for determining the wrinkling factor or estimating the efficiency function. Usually flame surface areas in experiments and Direct Numerical Simulation (DNS) analyses are evaluated differently and the present analysis aims at comparing these approaches by making use of a detailed chemistry DNS database of turbulent, statistically planar flames. It has been found that the flame surface area evaluation is sensitive to the choice of scalar quantity and the isosurface level, and this holds particularly true for two-dimensional evaluations. The conditions, which provide a satisfactory agreement between experimental and numerical approaches in the flame area evaluation, have been identified by a detailed comparative analysis of the usual postprocessing techniques.

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Funding

The authors are grateful to EPSRC, UK, the German Research Foundation (DFG, KL1456/5–1; DFG 237267381 – TRR 150) and competitive research funding from King Abdullah University of Science and Technology (KAUST) for financial support. Computational support by ARCHER, Rocket HPC, KAUST Supercomputing Laboratory is also gratefully acknowledged.

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Correspondence to M. Klein.

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This work did not involve any active collection of human data.

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Appendix

Appendix

The Software Paraview has been used for postprocessing the isosurfaces based flame surface areas [32]. In this respect, piecewise planar interface reconstructions (more precisely a triangulation) have been employed. The very famous “Marching cube” algorithm [41] has been used in order to calculate the isosurfaces. The evaluation of surface areas for our application has been verified in the following manner: The DNS data fields specified in the paper have been filtered and subsequently sampled on grids coarsened by a factor of 2 and 4 in each direction (denoted as DNS2 and DNS4, respectively). The DNS resolution is used as a reference and the relative errors have been calculated and are reported in the Table 4 below. Results indicate that a sufficiently small error is obtained for all cases. Furthermore, as the grid is coarsened by a factor two and four respectively, it demonstrates nearly quadratic convergence of flame areas with increasing resolution (except for case C).

Table 4 Relative error in % for isosurface based flame area determination (cT = 0.5) using Paraview for cases A,B,C. DNS2 and DNS4 refer to the DNS solution filtered and sampled on a two respectively four times coarser grid

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Klein, M., Herbert, A., Kosaka, H. et al. Evaluation of Flame Area Based on Detailed Chemistry DNS of Premixed Turbulent Hydrogen-Air Flames in Different Regimes of Combustion. Flow Turbulence Combust 104, 403–419 (2020). https://doi.org/10.1007/s10494-019-00068-2

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