Large-eddy simulation of a multi-injection flame in a diesel engine environment using an unsteady flamelet/progress variable approach

Wen, Xu; Gierth, Sandro; Rieth, Martin; Chen, Jacqueline H.; Hasse, Christian

doi:10.1063/5.0065351

Large-eddy simulation of a multi-injection flame in a diesel engine environment using an unsteady flamelet/progress variable approach

Journal Article · Tue Oct 05 00:00:00 EDT 2021 · Physics of Fluids

DOI:https://doi.org/10.1063/5.0065351· OSTI ID:1824254

; Gierth, Sandro; Rieth, Martin; Chen, Jacqueline H.;

In this work, large-eddy simulations (LESs) are conducted for a multiple-injection flame in a diesel engine environment using an unsteady flamelet/progress variable (UFPV) approach in which differential diffusion is considered. The suitability of the UFPV tabulation approach is first evaluated through a priori analyses using the state-of-the-art direct numerical simulation (DNS) dataset. Both the instantaneous data and the conditional values for the major and minor species' mass fractions are compared between the UFPV and the DNS. The comparisons show that the proposed UFPV tabulation approach can give good predictions for the multiple-injection flame at different injection phases. While the gas temperature and major species mass fractions can be accurately predicted with or without differential diffusion being considered in the UFPV flamelet library, the prediction accuracy for the highly diffusive species (e.g., hydrogen) in the main injection phase can be noticeably improved when differential diffusion is taken into account. The fully coupled LES/UFPV simulations show that the overall structure of the multiple-injection flame can be predicted, and the conditional thermo-chemical values are close to the filtered DNS dataset. The reasons for the remaining discrepancies found in the a priori analyses and the a posteriori simulations using the UFPV approach are analyzed.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1824254

Journal Information:: Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 10 Vol. 33; ISSN 1070-6631

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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