### Abstract

A common way of carrying out LES or RANS of premixed and partially premixed turbulent flames with tabulated combustion chemistry consists of using a presumed shape for the probability density function (PDF) of progress variable and mixture fraction in order to compute the reaction rates. Commonly utilized for this purpose is the β-function PDF. To the aim of clarifying the applicability of the presumed β-PDF approach to the modeling of methane and hydrogen turbulent premixed flames, in this paper an investigation of the probability density distribution is performed by processing three-dimensional DNS computational results performed with detailed chemistry. This analysis is performed by means of a detailed comparison between the DNS data and the corresponding a priori LES obtained with top-hat filters of various sizes. The analysis is conducted for hydrogen and methane turbulent flames, for comparison. In particular, it is assessed whether a lean premixed turbulent hydrogen-air flame can be well-represented in LES by a β-PDF approach as traditionally applied for methane in literature. It is shown that the presumed β-PDF model performs rather well for both hydrogen and methane. The total error between the real distribution and the presumed β-PDF is of comparable amount for the two fuels. However, the error shows a more consistent profile in methane flames. In addition, it is shown that mean and variance are not sufficient as control parameters for an improved modeling of hydrogen flames by means of presumed PDF, plausibly because of its strong differentially diffusive effects.

Language | English |
---|---|

Pages | 12811-12823 |

Number of pages | 13 |

Journal | International Journal of Hydrogen Energy |

Volume | 40 |

Issue number | 37 |

DOIs | |

State | Published - 5 Oct 2015 |

### Fingerprint

### Keywords

- Beta-pdf
- Hydrogen
- Premixed
- Presumed
- Subgrid
- Turbulent

### Cite this

*International Journal of Hydrogen Energy*,

*40*(37), 12811-12823. DOI: 10.1016/j.ijhydene.2015.07.110

}

*International Journal of Hydrogen Energy*, vol. 40, no. 37, pp. 12811-12823. DOI: 10.1016/j.ijhydene.2015.07.110

**An a priori DNS subgrid analysis of the presumed β-PDF model.** / Donini, A.; Bastiaans, R. J M; Van Oijen, J. A.; Day, M. S.; de Goey, Philip.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - An a priori DNS subgrid analysis of the presumed β-PDF model

AU - Donini,A.

AU - Bastiaans,R. J M

AU - Van Oijen,J. A.

AU - Day,M. S.

AU - de Goey,Philip

PY - 2015/10/5

Y1 - 2015/10/5

N2 - A common way of carrying out LES or RANS of premixed and partially premixed turbulent flames with tabulated combustion chemistry consists of using a presumed shape for the probability density function (PDF) of progress variable and mixture fraction in order to compute the reaction rates. Commonly utilized for this purpose is the β-function PDF. To the aim of clarifying the applicability of the presumed β-PDF approach to the modeling of methane and hydrogen turbulent premixed flames, in this paper an investigation of the probability density distribution is performed by processing three-dimensional DNS computational results performed with detailed chemistry. This analysis is performed by means of a detailed comparison between the DNS data and the corresponding a priori LES obtained with top-hat filters of various sizes. The analysis is conducted for hydrogen and methane turbulent flames, for comparison. In particular, it is assessed whether a lean premixed turbulent hydrogen-air flame can be well-represented in LES by a β-PDF approach as traditionally applied for methane in literature. It is shown that the presumed β-PDF model performs rather well for both hydrogen and methane. The total error between the real distribution and the presumed β-PDF is of comparable amount for the two fuels. However, the error shows a more consistent profile in methane flames. In addition, it is shown that mean and variance are not sufficient as control parameters for an improved modeling of hydrogen flames by means of presumed PDF, plausibly because of its strong differentially diffusive effects.

AB - A common way of carrying out LES or RANS of premixed and partially premixed turbulent flames with tabulated combustion chemistry consists of using a presumed shape for the probability density function (PDF) of progress variable and mixture fraction in order to compute the reaction rates. Commonly utilized for this purpose is the β-function PDF. To the aim of clarifying the applicability of the presumed β-PDF approach to the modeling of methane and hydrogen turbulent premixed flames, in this paper an investigation of the probability density distribution is performed by processing three-dimensional DNS computational results performed with detailed chemistry. This analysis is performed by means of a detailed comparison between the DNS data and the corresponding a priori LES obtained with top-hat filters of various sizes. The analysis is conducted for hydrogen and methane turbulent flames, for comparison. In particular, it is assessed whether a lean premixed turbulent hydrogen-air flame can be well-represented in LES by a β-PDF approach as traditionally applied for methane in literature. It is shown that the presumed β-PDF model performs rather well for both hydrogen and methane. The total error between the real distribution and the presumed β-PDF is of comparable amount for the two fuels. However, the error shows a more consistent profile in methane flames. In addition, it is shown that mean and variance are not sufficient as control parameters for an improved modeling of hydrogen flames by means of presumed PDF, plausibly because of its strong differentially diffusive effects.

KW - Beta-pdf

KW - Hydrogen

KW - Premixed

KW - Presumed

KW - Subgrid

KW - Turbulent

UR - http://www.scopus.com/inward/record.url?scp=84940795835&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2015.07.110

DO - 10.1016/j.ijhydene.2015.07.110

M3 - Article

VL - 40

SP - 12811

EP - 12823

JO - International Journal of Hydrogen Energy

T2 - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 37

ER -