Publications
309 results found
Gallot-Lavallée S, Jones WP, 2015, Large Eddy simulation of spray auto-ignition under EGR conditions, Flow Turbulence and Combustion, Vol: 96, Pages: 513-534, ISSN: 1573-1987
The paper describes the results of a computational study of the auto-ignition of afuel spray under Exhaust Gas Recirculation (EGR) conditions, a technique used to reducethe production of NOx. Large Eddy Simulation (LES) is performed, and the stochastic fieldmethod is used for the solution of the joint sub-grid probability density function (pdf) of thechemical species and energy. The fuel spray is n-heptane, a diesel surrogate and its chemicalkinetics are described by a reduced mechanism involving 22 species and 18 reaction steps.The method is applied to a constant volume combustion vessel able to reproduce EGRconditions by the ignition of a hot gas mixture previously introduced into the chamber. Oncethe prescribed conditions are reached the fuel is then injected. Different EGR conditions interms of temperature and initial ambient chemical composition are simulated. The resultsare in good overall agreement with measurements both regarding the ignition delay timesand the lift-off heights.
Jones WP, Jurisch M, Marquis AJ, 2015, Examination of an oscillating flame in the turbulent flow around a bluff body with large eddy simulation based on the probability density function method, Flow, Turbulence and Combustion, Vol: 95, Pages: 519-538, ISSN: 1386-6184
The present paper describes a Large Eddy Simulation modelling framework for the simulation of oscillating flames in practical flow configurations. The unresolved sub-grid scale motion is modelled using the dynamic Smagorinsky model in combination with the Probability Density Function method. It is shown that the Large Eddy Simulation method is capable of reproducing the characteristic shape of the reaction zone as well as the non-linear evolution of the total heat release rate in a bluff-body stabilised combustor. Commonly used measures for quantifying the variation of the total heat release rate are evaluated and examined in the present flow configuration of a lean-premixed ethylene-air flame. It was found that formaldehyde-based measures do not appropriately reproduce the amplitude and phase of the total heat release rate. A significantly improved correlation was achieved by employing the product of the mass fractions of molecular oxygen (O2) and the ketenyl radical (HCCO) as a means of characterising the variation of the total heat release rate.
Gallot Lavallee S, Jones WP, 2015, Large Eddy Simulation of High Pressure Spray Combustion, HpHRc
Bulat G, Jones WP, Navarro-Martinez S, 2015, Large eddy simulations of isothermal confined swirling flow in an industrial gas-turbine, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, Vol: 51, Pages: 50-64, ISSN: 0142-727X
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- Citations: 37
Jones WP, Marquis AJ, Wang F, 2015, Large eddy simulation of a premixed propane turbulent bluff body flame using the Eulerian stochastic field method, Fuel, Vol: 140, Pages: 514-525, ISSN: 0016-2361
A premixed propane/air flame stabilized on a triangular bluff body was studied by numerical simulation as a simplified model of many practical propulsion and power generation systems. The sub-grid scale (sgs) probability density function (pdf) approach in conjunction with the stochastic fields solution method is used to account for sgs turbulence–chemistry interactions; a skeleton chemistry mechanism with 4 reaction steps and 7 species was used to describe the propane–air reaction. Three cases, one non-reacting and two reacting were studied. The instantaneous flow pattern and CO concentration are discussed and the averaged velocity and temperature, the RMS velocity and temperature fluctuations and averaged CO mass fraction profiles are compared with the experimental data. The simulations show very good agreement with the experimental data demonstrating the capability of the LES method coupled with the sgs-pdf method in representing premixed combustion in complex flame configurations.
Jones WP, Marquis AJ, Noh D, 2015, LES of a methanol spray flame with a stochastic sub-grid model, Proceedings of the Combustion Institute, Vol: 35, Pages: 1685-1691, ISSN: 1873-2704
This paper describes the Large Eddy Simulation (LES) of a methanol/air turbulent nonpremixed spray flame. An Eulerian stochastic field method is employed for the turbulence-chemistry interaction of the gas phase while a Lagrangian formulation is used for the liquid phase. A reduced reaction mechanism (18 species and 14 reactions) is adopted and stochastic models are used to account for the influence of sub-grid scale (sgs) motions on droplet dispersion and evaporation. Comparisons of the predicted gas phase and droplet statistics with measurements show a good agreement confirming that the droplet dispersion and evaporation models used in this work are adequate. The general features of the spray flame such as the occurrence of external group combustion and its development into separate combusting islands are well captured.
Bulat G, Jones WP, Marquis AJ, 2014, NO and CO formation in an industrial gas-turbine combustion chamber using LES with the Eulerian sub-grid PDF method, Combustion and Flame, Vol: 161, Pages: 1804-1825, ISSN: 0010-2180
The advances in computing power and numerical schemes allow Large Eddy Simulation (LES) to use more detailed turbulent combustion models as well as to be applied to real gas turbine combustors. In this work, we investigate the emissions formation in an industrial gas-turbine combustion chamber using LES with an Eulerian stochastic sub-grid pdf model with reduced chemistry. Sub-grid stresses are represented by a dynamic version of the Smagorinsky model and sub-grid species fluctuations are characterised by eight stochastic fields. The chemistry was represented by an ARM reduced GRI 3.0 mechanism with 15 reaction steps and 19 species. All calculations were carried out using a detailed block-structured mesh capturing all geometrical features of the Siemens SGT-100 burner operating at a pressure of 3 bar. The influence of the radiation heat losses was investigated and the impact of an alternative 4-step chemical mechanism was discussed. The results show good agreement with the experimental data. The NO formation rates were quantified with prompt NO dominating the thermal and formation paths.
Jones WP, Marquis AJ, Vogiatzaki K, 2014, Large-eddy simulation of spray combustion in a gas turbine combustor, Combustion and Flame, Vol: 161, Pages: 222-239, ISSN: 0010-2180
The paper describes the results of a comprehensive study of turbulent mixing, fuel spray dispersion and evaporation and combustion in a gas-turbine combustor geometry (the DLR Generic Single Sector Combustor) with the aid of Large Eddy Simulation (LES). An Eulerian description of the continuous phase is adopted and is coupled with a Lagrangian formulation of the dispersed phase. The sub-grid scale (sgs) probability density function approach in conjunction with the stochastic fields solution method is used to account for sgs turbulence-chemistry interactions. Stochastic models are used to represent the influence of sgs fluctuations on droplet dispersion and evaporation. Two different test cases are simulated involving reacting and non-reacting conditions. The simulations of the underlying flow field are satisfying in terms of mean statistics and the structure of the flame is captured accurately. Detailed spray simulations are also presented and compared with measurements where the fuel spray model is shown to reproduce the measured Sauter Mean Diameter (SMD) and the velocity of the droplets accurately.
Prasad VN, Juddoo M, Masri AR, et al., 2013, Investigation of extinction and re-ignition in piloted turbulent non-premixed methane-air flames using LES and high-speed OH-LIF, COMBUSTION THEORY AND MODELLING, Vol: 17, Pages: 483-503, ISSN: 1364-7830
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- Citations: 18
Hammond KW, Laundry RJ, O'Leary TM, et al., 2013, Use of Text Search to Effectively Identify Lifetime Prevalence of Suicide Attempts Among Veterans, 46th Annual Hawaii International Conference on System Sciences (HICSS), Publisher: IEEE, Pages: 2676-2683, ISSN: 1060-3425
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- Citations: 13
Bulat G, Jones WP, Marquis AJ, 2013, Large Eddy Simulation of an industrial gas-turbine combustion chamber using sub-grid PDF method, Proceedings of the Combustion Institute, Vol: 34, Pages: 3155-3164
Jones WP, Lettieri C, Marquis AJ, et al., 2012, Large Eddy Simulation of the two-phase flow in an experimental swirl-stabilized burner, 8th International Symposium on Engineering Turbulence Modelling and Measurements
Jones WP, Marquis AJ, Prasad VN, 2012, LES of a turbulent premixed swirl burner using the Eulerian stochastic field method, COMBUSTION AND FLAME, Vol: 159, Pages: 3079-3095, ISSN: 0010-2180
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- Citations: 70
Jones WP, Lyra S, Navarro-Martinez S, 2012, Large Eddy Simulation of Turbulent Confined Highly Swirling Annular Flows, FLOW TURBULENCE AND COMBUSTION, Vol: 89, Pages: 361-384, ISSN: 1386-6184
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- Citations: 9
Jones WP, Lyra S, Navarro-Martinez S, 2012, Numerical investigation of swirling kerosene spray flames using Large Eddy Simulation, COMBUSTION AND FLAME, Vol: 159, Pages: 1539-1561, ISSN: 0010-2180
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- Citations: 52
Castaneda RA, Jones W, Shattuck M, et al., 2012, Trailer side underride crash testing: Relating collision damage to impact speed, ISSN: 0148-7191
The reconstruction of collisions involving trailer side underride by passenger vehicles is complex and challenging. A detailed analysis of the passenger vehicle's post-impact damage is required to evaluate the collision phase and ultimately to determine its impact speed. The research of trailer side underride crashes currently available to the accident reconstructionist, however, is relatively limited. This paper presents the results of controlled underride crash testing performed on eighteen instrumented low profile and high profile passenger vehicles colliding with the sides of commercial trailers at speeds ranging from 15 to 39 miles per hour. The pre and post-collision geometries of each test vehicle were documented with three-dimensional measurements to accurately quantify the collision damages sustained and relate them to the vehicle's kinetic energy and impact speed. The vehicle and trailer interactions during the collision phase of the tests are discussed with emphasis on the implications for accident reconstruction. The test results indicate that there exists a correlation between the kinetic energy of the colliding vehicle and the volume of the resulting intrusion damage, or crush zone. Additional underride crash tests performed by other researchers are integrated into the data set and the overall results further support the correlation found in this study. This paper presents a new method to derive relatively accurate speed estimates of both low profile and high profile passenger vehicles involved in trailer side underride collisions. Copyright © 2012 SAE International.
Jones WP, Prasad VN, 2011, LES-<i>pdf</i> simulation of a spark ignited turbulent methane jet, PROCEEDINGS OF THE COMBUSTION INSTITUTE, Vol: 33, Pages: 1355-1363, ISSN: 1540-7489
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- Citations: 49
Jones WP, Lyra S, Navarro-Martinez S, 2011, Large Eddy Simulation of a swirl stabilized spray flame, PROCEEDINGS OF THE COMBUSTION INSTITUTE, Vol: 33, Pages: 2153-2160, ISSN: 1540-7489
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- Citations: 37
Vogiatzaki K, Kronenburg A, Navarro-Martinez S, et al., 2011, Stochastic multiple mapping conditioning for a piloted, turbulent jet diffusion flame, PROCEEDINGS OF THE COMBUSTION INSTITUTE, Vol: 33, Pages: 1523-1531, ISSN: 1540-7489
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- Citations: 22
Jones WP, Tyliszczak A, 2010, Large Eddy Simulation of Spark Ignition in a Gas Turbine Combustor, FLOW TURBULENCE AND COMBUSTION, Vol: 85, Pages: 711-734, ISSN: 1386-6184
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- Citations: 62
Paul SC, Paul MC, Jones WP, 2010, Large Eddy Simulation of a turbulent non-premixed propane-air reacting flame in a cylindrical combustor, COMPUTERS & FLUIDS, Vol: 39, Pages: 1832-1847, ISSN: 0045-7930
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- Citations: 5
Jones WP, Lettieri C, 2010, Large eddy simulation of spray atomization with stochastic modeling of breakup, PHYSICS OF FLUIDS, Vol: 22, ISSN: 1070-6631
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- Citations: 26
Jones WP, Prasad VN, 2010, Large Eddy Simulation of the Sandia Flame Series (D-F) using the Eulerian stochastic field method, COMBUSTION AND FLAME, Vol: 157, Pages: 1621-1636, ISSN: 0010-2180
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- Citations: 145
Jones WP, Lyra S, Marquis AJ, 2010, Large Eddy Simulation of evaporating kerosene and acetone sprays, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, Vol: 53, Pages: 2491-2505, ISSN: 0017-9310
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- Citations: 32
Weerasinghe WMSR, Jones WP, 2010, Application of Lagrangian probability density function approach to a turbulent jet diffusion flame, JOURNAL OF TURBULENCE, Vol: 11, Pages: 1-37, ISSN: 1468-5248
Jones WP, Lyra S, Marquis AJ, 2010, Large Eddy simulation of a droplet laden turbulent mixing layer, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, Vol: 31, Pages: 93-100, ISSN: 0142-727X
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- Citations: 8
Jones WP, Lyra S, Marquis AJ, 2010, Large Eddy Simulation of a Turbulent Droplet Laden Mixing Layer, 7th International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, Publisher: SPRINGER, Pages: 485-490, ISSN: 1382-4309
Jones WP, Navarro-Martinez S, 2009, Numerical Study of n-Heptane Auto-ignition Using LES-PDF Methods, FLOW TURBULENCE AND COMBUSTION, Vol: 83, Pages: 407-423, ISSN: 1386-6184
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- Citations: 34
Rhea S, Bini M, Fairweather M, et al., 2009, RANS modelling and LES of a single-phase, impinging plane jet, COMPUTERS & CHEMICAL ENGINEERING, Vol: 33, Pages: 1344-1353, ISSN: 0098-1354
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- Citations: 33
Bini M, Jones WP, 2009, Large Eddy Simulation of an evaporating acetone spray, INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, Vol: 30, Pages: 471-480, ISSN: 0142-727X
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- Citations: 40
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