Simulation of turbulent reactive flows using a FDF methodology – Advances in particle density control for normalized variables

Damasceno, Marcelo; Santos, Jessica Guarato de Freitas; Vedovoto, João Marcelo

doi:10.1016/j.compfluid.2018.05.004

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…Future work is needed to refine the MC strategy in conjunction with AMR. Some progress in this regard has been reported [16,13]. 3.…”

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confidence: 98%

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PeleLM-FDF Large Eddy Simulator of Turbulent Combustion

Aitzhan¹,

Sammak²,

Givi³

et al. 2022

Preprint

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A new computational methodology, termed "PeleLM-FDF" is developed and utilized for high fidelity large eddy simulation (LES) of complex turbulent combustion systems. This methodology is constructed via a hybrid scheme combining the Eulerian PeleLM base flow solver with the Lagrangian Monte Carlo simulator of the filtered density function (FDF) for the subgrid scale reactive scalars. The resulting methodology is capable of simulating some of the most intricate physics of complex turbulence-combustion interactions. This is demonstrated by LES of a non-premixed CO/H 2 temporally evolving jet flame. The chemistry is modelled via a skeletal kinetics model, and the results are appraised via detail a posteriori comparisons against direct numerical simulation (DNS) data of the same flame. Excellent agreements are observed for the time evolution of various statistics of the thermo-chemical quantities, including the manifolds of the multi-scalar mixing. The new methodology is capable of capturing the complex phenomena of flame-extinction and re-ignition at a 1/512 of the computational cost of the DNS. The high fidelity and the computational affordability of the new PeleLM-FDF solver warrants its consideration for LES of practical turbulent combustion systems.

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“…Future work is needed to refine the MC strategy in conjunction with AMR. Some progress in this regard has been reported [16,13]. 3.…”

mentioning

confidence: 98%

“…Ref. [20,88,16,13,42,44,66,70,93,6,5,3,87,59,47,48,65,37,41,46,67,53,52,51]. Parallel with these developments, there have also been extensive studies regarding the FDF accuracy & reliability [76,39,48,14,66], and sensitivity analysis of its simulated results [92,91].…”

mentioning

confidence: 99%

PeleLM-FDF Large Eddy Simulator of Turbulent Combustion

Aitzhan¹,

Sammak²,

Givi³

et al. 2022

Preprint

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“…,Denner et al (2014),Jesus et al (2015),Barbi et al (2016),Damasceno, Santos and Vedovoto (2018),Duarte et al (2018).…”

mentioning

confidence: 99%

Lagrangian modeling of droplet evaporation

Pinheiro¹

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Evaporation of liquid droplets in high temperature gas environment is of great importance in many engineering applications. Accurate droplet evaporation predictions are crucial in modeling spray combustion, since it is considered a rate limiting process. For this reason, the present dissertation aims are, first, to implement and validate Lagrangian droplet evaporation models that are usually used in spray calculations, including equilibrium and non-equilibrium formulations, and, second, to use these models to pursue a deeper insight on the physical phenomena that may be involved in droplet evaporation processes. In order to validate and assess these theoretical model predictions, an in-house code was developed and diameter evolution results from the numerical simulations are compared to experimental data. First, the model performance is evaluated for water in a case of low evaporation rate and, then, it is evaluated for n-heptane in moderate and high evaporation rates using recent experimental data acquired with a new technique. The Abramzon-Sirignano model is the only one which does not overestimate the evaporation rate for any ambient condition tested, when compared with experimental rate. From the results, it is also revealed that, when a correction factor for energy transfer reduction due to evaporation is incorporated in the classical evaporation model, the predictions from this model and the nonequilibrium one cannot be differentiated, even if the initial droplet diameter is small. Furthermore, the incorporation of natural and forced convection effects on the droplet evaporation rate, by using an empirical correlation, is investigated, showing that including the Grashof number into the Ranz-Marshall correlation actually overestimates the evaporation rate for atmospheric pressure. Finally, the effects of ambient conditions on ethanol evaporation are investigated. Under ambient temperatures higher than the threshold temperature, the evaporation rate is enhanced with the increase of ambient pressure, contrary to what happens for cases when the ambient temperature is lower than the threshold temperature.

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