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Bao, Hesheng (author), Akargun, Hayri Yigit (author), Roekaerts, D.J.E.M. (author), Somers, Bart (author)In this work, an extension of the Flamelet Generated Manifold (FGM) method is developed suitable for igniting turbulent flames. To create the FGM, the strongly stretched flamelet equations (SSFE) are solved. Whereas in the standard basic method a single representative flamelet strain rate is used, in the new method a range of strain rates is...journal article 2023
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Bao, Hesheng (author), Han, Jinlin (author), Zhang, Yan (author), Di Matteo, Andrea (author), Roekaerts, D.J.E.M. (author), Van Oijen, Jeroen (author), Somers, Bart (author)In the current work, the Flamelet Generated Manifold (FGM) method is applied with large-eddy simulation (LES) to investigate the effect of methane on dual-fuel (DF) spray ignition. The diesel surrogate n-dodecane is injected as the so-called pilot fuel into selected lean methane–air mixtures, ranging from ϕ<sub>CH<sub>4</sub></sub>=0 to ϕ<sub...journal article 2023
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Fathi, Mohamad (author), Hickel, S. (author), Roekaerts, D.J.E.M. (author)Transcritical fuel sprays form an indispensable part of high-pressure energy-conversion systems. Modeling the complex real-fluid effects in the high-pressure multiphase regime of such sprays accurately, especially the hybrid subcritical-to-supercritical mode of evaporation during mixing fuel and oxidizer, is essential and challenging. This...book chapter 2023
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Shin, Donghoon (author), Francis, Akhil (author), Aravind, P.V. (author), Woudstra, T. (author), de Jong, W. (author), Roekaerts, D.J.E.M. (author)A theoretical evaluation of the biochar production process using a biomass gasifier has been carried out herein. Being distinguished from the previous research trend examining the use of a biomass gasifier, which has been focused on energy efficiency, the present study tries to figure out the effect of biochar production rate on the overall...journal article 2022
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Ren, Mengmeng (author), Kang, Yi (author), Zhao, Junxue (author), Zou, Chong (author), Shi, Ruimeng (author), Li, Bin (author), Roekaerts, D.J.E.M. (author)Oxy-fuel combustion of coal pyrolysis gas has recently been proposed to serve as internal heat source of a vertical low-temperature pyrolysis furnace, in order to make the output pyrolysis gas nearly free of nitrogen and widely useful. To keep the pyrolysis temperature and the heat carrier gas volume unchanged from air combustion to oxy-fuel...journal article 2022
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Huang, X. (author), Tummers, M.J. (author), van Veen, E.H. (author), Roekaerts, D.J.E.M. (author)The flamelet generated manifold (FGM) model is suitable for moderate or intense low oxygen dilution (MILD) combustion provided the flamelets underlying the manifold include the effects of strong dilution by products of the fuel/oxidizer mixture. Here we propose such an extended model based on the use of non-premixed flamelets diluted at the...journal article 2022
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Bhatia, Bharat (author), De, Ashoke (author), Roekaerts, D.J.E.M. (author), Masri, Assaad R. (author)This work focuses on the large eddy simulation and the study of turbulent dilute methanol spray flames in vitiated coflow using the secondary-oxidizer Flamelet Generated Model (FGM). The modified FGM model uses an additional secondary oxidizer parameter in addition to the three other parameters previously used for spray flames - progress...journal article 2022
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Fathi, Mohamad (author), Hickel, S. (author), Roekaerts, D.J.E.M. (author)We present a novel framework for high-fidelity simulations of inert and reacting sprays at transcritical conditions with highly accurate and computationally efficient models for complex real-gas effects in high-pressure environments, especially for the hybrid subcritical/supercritical mode of evaporation during the mixing of fuel and oxidizer...journal article 2022
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Stoellinger, Michael (author), Roekaerts, D.J.E.M. (author)The simple semi-empirical precursor soot model of Brookes and Moss based on the soot number density and soot mass concentration is adopted in a transported probability density function (PDF) method for turbulent diffusion flames. The gas phase chemistry is described by a flamelet generated manifold (FGM) based on the mixture fraction,...journal article 2022
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Pál, Botond (author), Roekaerts, D.J.E.M. (author), Zandbergen, B.T.C. (author)This study investigates the potential of a newly released multi-phase solver to simulate atomisation in an air-blast type atomiser. The 'VOF-to-DPM' solver was used to simulate primary and secondary atomisation in an atomiser with a coaxial injector-like geometry. The solver uses a hybrid Eulerian/Eulerian-Lagrangian formulation with...journal article 2021
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Naud, Bertrand (author), Roekaerts, D.J.E.M. (author)A Generalized Langevin Model (GLM) formulation to be used in transported joint velocity-scalar probability density function methods is recalled in order to imply a turbulent scalar-flux model where the pressure-scrambling term is in correspondence with standard Monin's return-to-isotropy term. The proposed non-constant C0 formulation is extended...journal article 2021
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Silvestri, S. (author), Roekaerts, D.J.E.M. (author), Pecnik, Rene (author)The present work investigates the modeling of turbulent heat transfer in flows where radiative and convective heat transfer are coupled. In high temperature radiatively participating flows, radiation is the most relevant heat transfer mechanism and, due to its non-locality, it causes counter intuitive interactions with the turbulent...journal article 2021
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Ren, Mengmeng (author), Wang, Shuzhong (author), Romero-Anton, N. (author), Zhao, Junxue (author), Zou, Chong (author), Roekaerts, D.J.E.M. (author)Eddy dissipation concept (EDC) model and flamelet generated manifolds (FGM) model are developed separately to study the temperature profiles and extinction limits of non-premixed hydrothermal flames. Predictions by the two models are evaluated comparatively by experimental data in literatures. FGM model shows relatively better prediction of...journal article 2021
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De, Ashoke (author), Sarras, G. (author), Roekaerts, D.J.E.M. (author)A probability density function (PDF)-based combustion modeling approach for RANS simulation of a jet issuing into a hot and diluted coflow is performed. A tabulated chemistry-based model, i.e., flamelet-generated manifold (FGM), is adopted in the PDF method. The manifolds are constructed using igniting counterflow diffusion flamelets with...book chapter 2021
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Romero-Anton, Naiara (author), Huang, X. (author), Bao, Hesheng (author), Martin-Eskudero, Koldo (author), Salazar-Herran, Erik (author), Roekaerts, D.J.E.M. (author)Flameless combustion, also called MILD combustion (Moderate or Intense Low Oxygen Dilution), is a technology that reduces NO<sub>x</sub> emissions and improves combustion efficiency. Appropriate turbulence-chemistry interaction models are needed to address this combustion regime via computational modelling. Following a similar analysis to...journal article 2020
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Taveau, J.R. (author), Lemkowitz, S.M. (author), Hochgreb, Simone (author), Roekaerts, D.J.E.M. (author)Many industrial processes handle, use, or produce metallic particles small enough to explode in air, thus posing severe explosion hazards. Finishing operations, for example, create very fine particles and have been involved in a growing number of accidents in recent years. New emerging processes, such as 3D printing, are being rapidly...journal article 2019
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Ren, M. (author), Wang, Shuzhong (author), Yang, Chuang (author), Xu, Haitao (author), Guo, Yang (author), Roekaerts, D.J.E.M. (author)This work reports an experimental study on supercritical water oxidation of quinoline. Moderate preheat temperature (420 °C–510 °C) and initial concentration (1 wt%–10 wt%) are selected to address the possibility of utilizing the heat released during the reaction, in order to realize high conversion rate at relatively low preheat temperature....journal article 2019
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Ren, M. (author), Wang, Shuzhong (author), Roekaerts, D.J.E.M. (author)Counterflow diffusion flames of methanol hydrothermal combustion are investigated to improve the understanding of hydrothermal flames. It is indicated that the thermodynamic properties by the Peng-Robinson equation of state and the modified transport properties can reduce the flame temperature by about 500 K. The Takahashi correlation for...journal article 2019
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- Taveau, J.R. (author), Lemkowitz, S.M. (author), Hochgreb, Simone (author), Roekaerts, D.J.E.M. (author) abstract 2018
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- Huang, X. (author), van Veen, E.H. (author), Tummers, M.J. (author), Roekaerts, D.J.E.M. (author) abstract 2018