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Dr Stathis Tingas' Outputs (85)

CSP analysis of Local Sensitivity data (2019)
Presentation / Conference Contribution
Tingas, S., & Goussis, D. (2019, June). CSP analysis of Local Sensitivity data. Paper presented at 7th International Workshop on Model Reduction in Reactive Flow (IWMRRF), Trondheim, Norway

Tingas, S., & Goussis, D. (2019, June). CSP analysis of Local Sensitivity data. Paper presented at 7th International Workshop on Model Reduction in Reactive Flow (IWMRRF), Trondheim, Norway.

A Generalized Partially Stirred Reactor Combustion Closure Using Computational Singular Perturbation Analysis (2019)
Presentation / Conference Contribution
Quadarella, E., Stagni, A., Tingas, S., Cuoci, A., Parente, A., Faravelli, T., & Im, H. (2019, June). A Generalized Partially Stirred Reactor Combustion Closure Using Computational Singular Perturbation Analysis. Paper presented at 11th Mediterranean Combustion Symposium, Tenerife, Spain

Quadarella, E., Stagni, A., Tingas, S., Cuoci, A., Parente, A., Faravelli, T., & Im, H. (2019, June). A Generalized Partially Stirred Reactor Combustion Closure Using Computational Singular Perturbation Analysis. Paper presented at 11th Mediterranean... Read More about A Generalized Partially Stirred Reactor Combustion Closure Using Computational Singular Perturbation Analysis.

A Unified Description of Flame Topologies at Different Turbulent Combustion Regimes Using Computational Singular Perturbation (2019)
Presentation / Conference Contribution
Tingas, S., & Im, H. (2019, May). A Unified Description of Flame Topologies at Different Turbulent Combustion Regimes Using Computational Singular Perturbation. Paper presented at 17th International Conference on Numerical Combustion, Aachen, Germany

Identifying turbulent flame topologies for unambiguous deter-mination of key flame quantities is a challenging task for high Karlovitz number conditions in which different scalar variable sexhibit drastically distinct characteristics. The present st... Read More about A Unified Description of Flame Topologies at Different Turbulent Combustion Regimes Using Computational Singular Perturbation.

Turbulent Burning Characteristics of Hydrogen/Air Premixed Flames in Different Combustion Regimes (2019)
Presentation / Conference Contribution
Song, W., Tingas, S., Hernández Pérez, F. E., & Im, H. G. (2019, April). Turbulent Burning Characteristics of Hydrogen/Air Premixed Flames in Different Combustion Regimes. Paper presented at 9th European Combustion Meeting, Lisbon, Portugal

Song, W., Tingas, S., Hernández Pérez, F. E., & Im, H. G. (2019, April). Turbulent Burning Characteristics of Hydrogen/Air Premixed Flames in Different Combustion Regimes. Paper presented at 9th European Combustion Meeting, Lisbon, Portugal.

CSP and Local Sensitivity Analysis (2019)
Presentation / Conference Contribution
Tingas, S., & Goussis, D. (2019, March). CSP and Local Sensitivity Analysis. Paper presented at 11th US National Combustion Meeting, Pasadena, CA, USA

Tingas, S., & Goussis, D. (2019, March). CSP and Local Sensitivity Analysis. Paper presented at 11th US National Combustion Meeting, Pasadena, CA, USA.

Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model (2019)
Journal Article
Li, Y., Alfazazi, A., Mohan, B., Alexandros Tingas, E., Badra, J., Im, H. G., & Mani Sarathy, S. (2019). Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model. Fuel, 247, 164-178. https://doi.org/10.1016/j.fuel.2019.03.052

The prospect of blending gasoline fuel with ethanol is being investigated as a potential way to improve the knock residence of the base gasoline. However, one of the drawbacks is a lack of proper understanding of the reason for the non-linear respons... Read More about Development of a reduced four-component (toluene/n-heptane/iso-octane/ethanol) gasoline surrogate model.

DNS of turbulent premixed flames propagating in a channel (2019)
Presentation / Conference Contribution
Song, W., Tingas, S., Hernandez Perez, F., & Im, H. (2019, March). DNS of turbulent premixed flames propagating in a channel. Poster presented at KAUST Research Conference on Future of Fuels and Energy, KAUST, Thuwal, Saudi Arabia

Song, W., Tingas, S., Hernandez Perez, F., & Im, H. (2019, March). DNS of turbulent premixed flames propagating in a channel. Poster presented at KAUST Research Conference on Future of Fuels and Energy, KAUST, Thuwal, Saudi Arabia.

Focusing on lactate shuttle: a model of brain metabolism analyzed with CSP (2019)
Presentation / Conference Contribution
Patsatzis, D., Tingas, S., Goussis, D. A., & Mani Sarathy, S. (2019, February). Focusing on lactate shuttle: a model of brain metabolism analyzed with CSP. Paper presented at 10th International Conference Dynamical Systems Applied to Biology and Natural Sciences (DSABNS), Napoli, Italy

The mammalian brain utilizes glucose as its main source of energy. However,it has been recently discovered that lactate can also be considered important as a fuel and a signaling molecule in neuronal activity, especially during neuronalactivation. Th... Read More about Focusing on lactate shuttle: a model of brain metabolism analyzed with CSP.

Dynamics Analysis of a Turbulent Methane Flame in MILD Combustion Conditions (2019)
Presentation / Conference Contribution
Manias, D. M., Tingas, E.-A., Im, H. G., & Minamoto, Y. (2019, January). Dynamics Analysis of a Turbulent Methane Flame in MILD Combustion Conditions. Presented at AIAA Scitech 2019 Forum, San Diego, California

The dominant physical processes that characterize the combustion of a lean methane/air mixture, diluted with exhaust gas recirculation (EGR), under turbulent MILD premixed conditions are identified using the combined approaches of Computational Singu... Read More about Dynamics Analysis of a Turbulent Methane Flame in MILD Combustion Conditions.

H2/Air Autoignition Dynamics around the Third Explosion Limit (2018)
Journal Article
Tingas, E.-A., Kyritsis, D. C., & Goussis, D. A. (2019). H2/Air Autoignition Dynamics around the Third Explosion Limit. Journal of Energy Engineering, 145(1), Article 04018074. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000588

This paper examines the influence of wall reactions on the generation of the explosive time scale that characterizes ignition delay around the third explosion limit of a stoichiometric H2/air homogeneous mixture. The only wall reactions exhibiting a... Read More about H2/Air Autoignition Dynamics around the Third Explosion Limit.

Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index (2018)
Journal Article
Manias, D. M., Tingas, E.-A., Hernández Pérez, F. E., Malpica Galassi, R., Paolo Ciottoli, P., Valorani, M., & Im, H. G. (2019). Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index. Combustion and Flame, 200, 155-167. https://doi.org/10.1016/j.combustflame.2018.11.023

Turbulent premixed flames at high Karlovitz numbers exhibit highly complex structures in different reactive scalar fields to the extent that the definition of the flame front in an unambiguous manner is not straightforward. This poses a significant c... Read More about Investigation of the turbulent flame structure and topology at different Karlovitz numbers using the tangential stretching rate index.

Three-stage heat release in n-heptane auto-ignition (2018)
Journal Article
Sarathy, S. M., Tingas, E.-A., Nasir, E. F., Detogni, A., Wang, Z., Farooq, A., & Im, H. (2019). Three-stage heat release in n-heptane auto-ignition. Proceedings of the Combustion Institute, 37(1), 485-492. https://doi.org/10.1016/j.proci.2018.07.075

Multi-stage heat release is an important feature of hydrocarbon auto-ignition that influences engine operation. This work presents findings of previously unreported three-stage heat release in the auto-ignition of n-heptane/air mixtures at lean equiv... Read More about Three-stage heat release in n-heptane auto-ignition.

Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames (2018)
Journal Article
Tingas, E.-A., Diamantis, D. J., & Goussis, D. A. (2018). Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames. Combustion Theory and Modelling, 22(6), 1049-1083. https://doi.org/10.1080/13647830.2018.1470333

A model reduction methodology, based on the quasi steady-state approximation (QSSA), is employed for the construction of reduced mechanisms in the case of an n-heptane/air premixed flame. Several issues related to the construction of these reduced me... Read More about Issues arising in the construction of QSSA mechanisms: the case of reduced n-heptane/air models for premixed flames.

A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer (2018)
Journal Article
Song, W., Tingas, E.-A., & Im, H. G. (2018). A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer. Combustion and Flame, 195, 84-98. https://doi.org/10.1016/j.combustflame.2018.03.037

To provide fundamental insights into the ignition enhancement of methanol (MeOH) by the addition of the more reactive dimethyl ether (DME), computational parametric studies were conducted in a one-dimensional counterflow fuel versus air mixing layer... Read More about A computational analysis of methanol autoignition enhancement by dimethyl ether addition in a counterflow mixing layer.

Computational singular perturbation analysis of super-knock in SI engines (2018)
Journal Article
Jaasim, M., Tingas, E.-A., Hernández Pérez, F. E., & Im, H. G. (2018). Computational singular perturbation analysis of super-knock in SI engines. Fuel, 225, 184-191. https://doi.org/10.1016/j.fuel.2018.03.128

Pre-ignition engine cycles leading to super-knock were simulated with a 48 species skeletal iso-octane mechanism to identify the dominant reaction pathways that are present in super-knock. To mimic pre-ignition, a deflagration front was generated via... Read More about Computational singular perturbation analysis of super-knock in SI engines.

CH4/air homogeneous autoignition: A comparison of two chemical kinetics mechanisms (2018)
Journal Article
Tingas, E. A., Manias, D. M., Mani Sarathy, S., & Goussis, D. A. (2018). CH4/air homogeneous autoignition: A comparison of two chemical kinetics mechanisms. Fuel, 223, 74-85. https://doi.org/10.1016/j.fuel.2018.03.025

Reactions contributing to the generation of the explosive time scale that characterise autoignition of homogeneous stoichiometric CH4/air mixture are identified using two different chemical kinetics models; the well known GRI-3.0 mechanism (53/325 sp... Read More about CH4/air homogeneous autoignition: A comparison of two chemical kinetics mechanisms.

Chemical kinetic insights into the ignition dynamics of n-hexane (2018)
Journal Article
Tingas, E.-A., Wang, Z., Mani Sarathy, S., Im, H. G., & Goussis, D. A. (2018). Chemical kinetic insights into the ignition dynamics of n-hexane. Combustion and Flame, 188, 28-40. https://doi.org/10.1016/j.combustflame.2017.09.024

Normal alkanes constitute a significant fraction of transportation fuels, and are the primary drivers of ignition processes in gasoline and diesel fuels. Low temperature ignition of n-alkanes is driven by a complex sequence of oxidation reactions, fo... Read More about Chemical kinetic insights into the ignition dynamics of n-hexane.

Analysis of Hydrogen/Air Turbulent Premixed Flames at Different Karlovitz Numbers Using Computational Singular Perturbation (2018)
Presentation / Conference Contribution
Manias, D. M., Tingas, E.-A., Hernández Pérez, F. E., Im, H. G., Galassi, R. M., Ciottoli, P. P., & Valorani, M. (2018, January). Analysis of Hydrogen/Air Turbulent Premixed Flames at Different Karlovitz Numbers Using Computational Singular Perturbation. Presented at 2018 AIAA Aerospace Sciences Meeting, Kissimmee, Florida

The dynamics and structure of two turbulent H2/air premixed flames, representative of the corrugated flamelet (Case 1) and thin reaction zone (Case 2) regimes, are analyzed and compared, using the computational singular perturbation (CSP) tools, by i... Read More about Analysis of Hydrogen/Air Turbulent Premixed Flames at Different Karlovitz Numbers Using Computational Singular Perturbation.

Dynamical Analysis of Turbulent Premixed Hydrogen/Air Flames in the Thin Reaction Zone Regime (2017)
Presentation / Conference Contribution
Tingas, E., Kashtanov, R., Hernández Pérez, F., Im, H., Paolo Ciottoli, P., Malpica Galassi, R., & Valorani, M. (2017, December). Dynamical Analysis of Turbulent Premixed Hydrogen/Air Flames in the Thin Reaction Zone Regime. Paper presented at 11th Asia-Pacific Conference on Combustion, Sydney, Australia

Tingas, E., Kashtanov, R., Hernández Pérez, F., Im, H., Paolo Ciottoli, P., Malpica Galassi, R., & Valorani, M. (2017, December). Dynamical Analysis of Turbulent Premixed Hydrogen/Air Flames in the Thin Reaction Zone Regime. Paper presented at 11th A... Read More about Dynamical Analysis of Turbulent Premixed Hydrogen/Air Flames in the Thin Reaction Zone Regime.