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ISSN Online: 2379-1748

9th Thermal and Fluids Engineering Conference (TFEC)
April, 21-24, 2024, Corvallis, OR, USA

SUBGRID MODELING OF REACTION-RATE USING A MULTI-SCALE STRATEGY FOR LARGE-EDDY SIMULATION OF TURBULENT PREMIXED FLAMES

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DOI: 10.1615/TFEC2024.cbf.050704

Resumo

In this study, we examine the performance of a multi-scale model for large-eddy simulation (LES) of turbulent premixed flames. The model referred to as RRLES performs the closure of the filtered reaction-rate term in the species transport equation while performing LES by using the linear eddy mixing (LEM) model. The RRLES model uses a multi-scale strategy to obtain the filtered reaction rate of the species and has been shown to address some of the challenges associated with the well-established LEMLES approach. The originally proposed RRLES strategy used a multilevel adaptive mesh refinement (AMR) framework, which was extended to use a single grid-based strategy to enable the application to complex geometries. Additionally, a local dual-resolution grid strategy has also been developed, which can potentially be used with different grid topologies, without the need for the AMR. We assess the accuracy and efficiency of the dual-grid RRLES approach by considering a freely propagating turbulent premixed flame under two different initial conditions corresponding to the thin reaction zone (TRZ) and the broken/distributed reaction zone (B/DRZ) regimes.