Dr Stathis Tingas' Outputs (81)

The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions (2021)
Journal Article
Tingas, E.-A. (2021). The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions. Fuel, 296, Article 120594. https://doi.org/10.1016/j.fuel.2021.120594

In the current work, the use of hydrogen peroxide as an additive to hydrogen/air mixtures is proposed and explored computationally, in conditions relevant to compression ignition engines. The hydrogen/hydrogen peroxide blends are supplemented with st... Read More about The chemical dynamics of hydrogen/hydrogen peroxide blends diluted with steam at compression ignition relevant conditions.

Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications (2020)
Journal Article
Sharmin, N., & Tingas, E.-A. (2020). Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications. Journal of Energy Engineering, 146(6), Article 04020064. https://doi.org/10.1061/%28asce%29ey.1943-7897.0000714

The autoignition dynamics of a three-component surrogate jet fuel (66.2% n-dodecane, 15.8% n-proplylbenzene, 18.0% 1,3,5-trimethylcyclohexane) suitable for usage as Jet A-1 and RP-3 aviation fuels are analyzed, using the detailed mechanism of Liu et... Read More about Dynamics Analysis of a Jet-Fuel Surrogate and Development of a Skeletal Mechanism for Computational Fluid Dynamic Applications.

Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 2, Analyses of Ignition Systems, Laminar and Turbulent Flames (2020)
Book Chapter
Valorani, M., Creta, F., Ciottoli, P. P., Malpica Galassi, R., Goussis, D. A., Najm, H. N., Paolucci, S., Im, H. G., Tingas, E.-A., Manias, D. M., Parente, A., Li, Z., & Grenga, T. (2020). Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 2, Analyses of Ignition Systems, Laminar and Turbulent Flames. In H. Pitsch, & A. Attili (Eds.), Data Analysis for Direct Numerical Simulations of Turbulent Combustion: From Equation-Based Analysis to Machine Learning (65-88). Springer. https://doi.org/10.1007/978-3-030-44718-2_4

Chapter 3 summarized the highlights of the concepts behind the CSP method and the TSR analysis. In this chapter, we will discuss a few applications of these techniques.

Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts (2020)
Book Chapter
Valorani, M., Creta, F., Ciottoli, P. P., Malpica Galassi, R., Goussis, D. A., Najm, H. N., Paolucci, S., Im, H. G., Tingas, E.-A., Manias, D. M., Parente, A., Li, Z., & Grenga, T. (2020). Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts. In H. Pitsch, & A. Attili (Eds.), Data Analysis for Direct Numerical Simulations of Turbulent Combustion (43-64). Springer. https://doi.org/10.1007/978-3-030-44718-2_3

This chapter provides a review of the basic ideas at the core of the Computational Singular Perturbation (CSP) method and the Tangential Stretching Rate (TSR) analysis. It includes a coherent summary of the theoretical foundations of these two method... Read More about Computational Singular Perturbation Method and Tangential Stretching Rate Analysis of Large Scale Simulations of Reactive Flows: Feature Tracking, Time Scale Characterization, and Cause/Effect Identification. Part 1, Basic Concepts.

Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales (2020)
Journal Article
Yalamanchi, K. K., Tingas, E., Im, H. G., & Sarathy, S. M. (2020). Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales. International Journal of Chemical Kinetics, 52(9), 599-610. https://doi.org/10.1002/kin.21373

Detailed gas‐phase chemical kinetic models are widely used in combustion research, and many new mechanisms for different fuels and reacting conditions are developed each year. Recent works have highlighted the need for error checking when preparing s... Read More about Screening gas‐phase chemical kinetic models: Collision limit compliance and ultrafast timescales.

DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions (2020)
Presentation / Conference Contribution
Song, W., Hernandez Perez, F., Tingas, A.-E., & Im, H. G. (2020, January). DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions. Presented at AIAA Scitech 2020 Forum, Orlando, FL

To investigate the turbulent flame speed at high Karlovitz number (Ka) conditions, high fidelity direct numerical simulations (DNS) of lean hydrogen/air premixed flames propagating in a channel are performed with forced turbulence. The turbulent flame sp... Read More about DNS of Lean Hydrogen Turbulent Premixed Flames at High Karlovitz Number Conditions.

Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames (2020)
Presentation / Conference Contribution
Hernandez Perez, F. E., Im, H. G., & Tingas, A. E. (2020, January). Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames. Presented at AIAA Scitech 2020 Forum, Orlando, FL

A computational study of steady, rod-stabilized, inverted, lean, CH4-air and H2-CH4-air flames is conducted. For the CH4-air flames, either decreasing the inlet equivalence ratio or increasing the mean inflow velocity leads to a larger standoff dista... Read More about Computational investigation of rod-stabilized laminar premixed hydrogen–methane–air flames.

Computational singular perturbation analysis of brain lactate metabolism (2019)
Journal Article
Patsatzis, D. G., Tingas, E.-A., Goussis, D. A., & Sarathy, S. M. (2019). Computational singular perturbation analysis of brain lactate metabolism. PLOS ONE, 14(12), Article e0226094. https://doi.org/10.1371/journal.pone.0226094

Lactate in the brain is considered an important fuel and signalling molecule for neuronal activity, especially during neuronal activation. Whether lactate is shuttled from astrocytes to neurons or from neurons to astrocytes leads to the contradictory... Read More about Computational singular perturbation analysis of brain lactate metabolism.

Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions (2019)
Presentation / Conference Contribution
Song, W., Hernandez Perez, F. E., Tingas, S., & Im, H. (2019, November). Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions. Paper presented at 72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, Washington, USA

Moderate or intense low-oxygen dilution (MILD) combustion is a promising concept to achieve high-performance and low-emission combustion simultaneously. In this study, we investigate the front propagation and burning characteristics in the MILD mode... Read More about Direct Numerical Simulation of Turbulent Hydrogen-Air Premixed Flames at Preheated and Diluted Donditions.

Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures (2019)
Journal Article
Khalil, A. T., Manias, D. M., Tingas, E.-A., Kyritsis, D. C., & Goussis, D. A. (2019). Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures. Energies, 12(23), Article 4422. https://doi.org/10.3390/en12234422

The dynamics of a homogeneous adiabatic autoignition of an ammonia/air mixture at constant volume was studied, using the algorithmic tools of Computational Singular Perturbation. Since ammonia combustion is characterized by both unrealistically long... Read More about Algorithmic Analysis of Chemical Dynamics of the Autoignition of NH3–H2O2/Air Mixtures.

Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels (2019)
Journal Article
Singh, E., Tingas, E.-A., Goussis, D., Im, H. G., & Sarathy, S. M. (2019). Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels. Energy and Fuels, 33(10), 10185-10196. https://doi.org/10.1021/acs.energyfuels.9b01423

Synergistic octane blending behavior of ethanol with gasoline and its surrogates has been observed by many researchers. The nonlinear octane boosting tendency is observed at mid and high molar blends of ethanol in primary reference fuels. The present... Read More about Chemical Ignition Characteristics of Ethanol Blending with Primary Reference Fuels.

Heat Capacity Effect on Ethanol Preignition in a Shock Tube (2019)
Presentation / Conference Contribution
Bau Luong, M., Figueroa-Labastida, M., Tingas, S., Sow, A., Hernández Pérez, F. E., Badra, J., Farooq, A., & Im, H. G. (2019, July). Heat Capacity Effect on Ethanol Preignition in a Shock Tube. Paper presented at 27th International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS), Beijing, China

Topological and chemical characteristics of turbulent flames at MILD conditions (2019)
Journal Article
Manias, D. M., Tingas, E.-A., Minamoto, Y., & Im, H. G. (2019). Topological and chemical characteristics of turbulent flames at MILD conditions. Combustion and Flame, 208, 86-98. https://doi.org/10.1016/j.combustflame.2019.06.031

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 approach of Computational Singular Pe... Read More about Topological and chemical characteristics of turbulent flames at MILD conditions.

Screening Chemical Kinetic Models: Collision Limit Violations and Ultra-Fast Time Scales (2019)
Presentation / Conference Contribution
Yalamanchi, K. K., Tingas, S., Im, H. G., & Sarathy, S. M. (2019, July). Screening Chemical Kinetic Models: Collision Limit Violations and Ultra-Fast Time Scales. Paper presented at 12th Asia-Pacific Conference on Combustion (ASPACC), Fukuoka, Japan

Detailed chemical kinetic models are widely used in combustion research and many new mechanisms for different fuels and reacting conditions are developed and published each year. Recent works have highlighted the need for error checking when preparin... Read More about Screening Chemical Kinetic Models: Collision Limit Violations and Ultra-Fast Time Scales.

Chemical Dynamics of the Ignition of NH3-H2O2 mixtures (2019)
Presentation / Conference Contribution
Khalil, A. T., Tingas, S., Kyritsis, D. C., & Goussis, D. A. (2019, June). Chemical Dynamics of the Ignition of NH3-H2O2 mixtures. Paper presented at 3rd International Conference of Chemical Engineering, Santander, Spain

Khalil, A. T., Tingas, S., Kyritsis, D. C., & Goussis, D. A. (2019, June). Chemical Dynamics of the Ignition of NH3-H2O2 mixtures. Paper presented at 3rd International Conference of Chemical Engineering, Santander, Spain.

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.

Unravelling the chemical and transport characteristics of turbulent MILD combustion (2019)
Presentation / Conference Contribution
Manias, D. M., Tingas, S., Minamoto, Y., & Im, H. G. (2019, June). Unravelling the chemical and transport characteristics of turbulent MILD combustion. Paper presented at 7th International Workshop on Model Reduction in Reactive Flow (IWMRRF), Trondheim, Norway

Manias, D. M., Tingas, S., Minamoto, Y., & Im, H. G. (2019, June). Unravelling the chemical and transport characteristics of turbulent MILD combustion. Paper presented at 7th International Workshop on Model Reduction in Reactive Flow (IWMRRF), Trondh... Read More about Unravelling the chemical and transport characteristics of turbulent MILD combustion.

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.