Abstract
This work addresses a shortcoming of the beta distribution when applied to assumed probability density function (PDF) methods for reactive flow, such as the flamelet-progress variable method. Regardless of parameter values, the beta distribution contains the entire sample space of a conserved scalar, which can be shown to violate the strong maximum principle of partial differential equations. To remedy this, a new class of probability distributions is introduced and tested on several conserved scalar mixing problems. The new distributions do not violate the strong maximum principle, and are in better quantitative agreement with transported PDF and DNS solutions than the beta distribution. The effects of filter width and residence time are examined, and extensions to multiple mixture fractions are outlined.
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Acknowledgements
The author would like to thank Dr. B.A. Perry and Prof. M.E. Mueller for sharing their DNS data, which was invaluable for the development and testing of the \(PSD_F\) distributions.
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Popov, P.P. Alternatives to the Beta Distribution in Assumed PDF Methods for Turbulent Reactive Flow. Flow Turbulence Combust 108, 433–459 (2022). https://doi.org/10.1007/s10494-021-00275-w
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DOI: https://doi.org/10.1007/s10494-021-00275-w