% This file was created with JabRef 2.7.2. % Encoding: ISO8859_1 @PHDTHESIS{th_jorge, author = {Amaya, J.}, title = {Unsteady coupled convection, conduction and radiation simulations on parallel architectures for combustion applications}, school = {CERFACS}, year = {2010}, file = {:th_jorge.pdf:PDF}, owner = {poitou}, timestamp = {2009.10.24} } @ARTICLE{Amaya2009, author = {J. Amaya and O. Cabrit and D. Poitou and B. Cuenot and M. El Hafi}, title = {Unsteady coupling of {Navier-Stokes} and radiative heat transfer solvers applied to an anisothermal multicomponent turbulent channel flow}, journal = {Journal of Quantitative Spectroscopy and Radiative Transfer}, year = {2010}, volume = {111}, pages = {295--301}, number = {2}, abstract = {Direct numerical simulations {(DNS)} of an anisothermal reacting turbulent channel flow with and without radiative source terms have been performed to study the influence of the radiative heat transfer on the optically non-homogeneous boundary layer structure. A methodology for the study of the emitting/absorbing turbulent boundary layer {(TBL)} is presented. Details on the coupling strategy and the parallelization techniques are exposed. An analysis of the first order statistics is then carried out. It is shown that, in the studied configuration, the global structure of the thermal boundary layer is not significantly modified by radiation. However, the radiative transfer mechanism is not negligible and contributes to the heat losses at the walls. The classical law-of-the-wall for temperature can thus be improved for {RANS/LES} simulations taking into account the radiative contribution.}, doi = {10.1016/j.jqsrt.2009.06.014}, file = {:Amaya2009.pdf:PDF}, issn = {0022-4073}, keywords = {Direct numerical simulation, Discrete ordinates method, Non-gray gas radiation, Turbulent channel}, owner = {poitou}, timestamp = {2010.02.09}, url = {http://www.sciencedirect.com/science/article/B6TVR-4WMDHTF-3/2/98cedf2e7c920dbb62d58608495743b0} } @INPROCEEDINGS{jorge_euro, author = {J. Amaya and O. Cabrit and D. Poitou and B. Cuenot and Hafi, M. El}, title = {Unsteady coupling of Navier-Stokes and Radiative Heat Transfer solvers applied to an anisothermal multicomponent turbulent channel flow}, booktitle = {Proceedings of Eurotherm83 -- Computational Thermal Radiation in Participating Media III}, year = {2009}, abstract = {Direct numerical simulations (DNS) of an anisothermal reacting turbulent channel flow with and without radiative source terms have been performed to study the influence of the radiative heat transfer on the optically non-homogeneous boundary layer structure. A methodology for the study of the emitting/absorbing turbulent boundary layer (TBL) is presented. Details on the coupling strategy and the parallelisation techniques are exposed. An analysis of the first order statistics is then carried up. It is shown that, in the studied configuration, the global structure of the thermal boundary layer is not significantly modified by radiation. However, the radiative transfer mecha- nism is not negligible and contributes to the heat losses at the walls. The classical law-of-the-wall for temperature can thus be improved for RANS/LES simulations taking into account the radiative contribution.}, file = {:RADIATION2009-AMAYA_et_al.pdf:PDF}, owner = {poitou}, timestamp = {2009.05.29} } @INPROCEEDINGS{Amaya10conf, author = {J. Amaya and E. Collado and B. Cuenot and T. Poinsot}, title = {Coupling {LES}, radiation and structure in gas turbine simulations}, booktitle = {Proceedings of the Summer Program}, year = {2010}, address = {Center for Turbulence Research, NASA AMES, Stanford University, USA}, __markedentry = {[poitou]}, access = {conf}, file = {:Amaya10conf.pdf:PDF}, keywords = {AVBP, AVTP, PRISSMA, LES, radiation, conduction, heat transfer}, owner = {poitou}, timestamp = {2011.09.19}, url = {http://www.cerfacs.fr/~cfdbib/repository/TR_CFD_10_91.pdf} } @ARTICLE{NHT1, author = {P. J. Coelho and P. Perez and M. El Hafi}, title = {Benchmark numerical solutions for radiative heat transfer in two-dimensional axisymmetric enclosures with non-gray sooting media}, journal = {Numerical Heat Transfer, Part B: Fundamentals}, year = {2003}, volume = {43}, pages = {425 -- 444}, number = {5}, abstract = {Accurate numerical solutions for radiative heat transfer in two-dimensional axisymmetric black enclosures with nongray sooting media have been obtained using three different methods. The ray tracing method together with the statistical narrow-band model is used to obtain highly accurate solutions for benchmark purposes. The Monte Carlo method using a net exchange formulation and the statistical narrow-band correlated k -distribution method also yield very accurate solutions, in excellent agreement with the ray tracing results. The discrete ordinates method combined with the correlated k -distribution method provides less accurate, but more economical, solutions, which are adequate for most practical applications. The solution accuracy of the methods is investigated and demonstrated, and results suitable for benchmarking are given in tabular form.}, file = {:NHT1.pdf:PDF}, owner = {poitou}, timestamp = {2009.05.12}, url = {http://www.informaworld.com/10.1080/713836240} } @ARTICLE{Jensen2007, author = {K. A. Jensen and J.F. Ripoll and A. Wray and D. Joseph and M El Hafi}, title = {On various modeling approaches to radiative heat transfer in pool fires}, journal = {Combustion and Flame}, year = {2007}, volume = {148}, pages = {263--279}, number = {4}, month = mar, abstract = {Six computational methods for solution of the radiative transfer equation in an absorbing–emitting, nonscattering gray medium were compared for a 2-m {JP-8} pool fire. The emission temperature and absorption coefficient fields were taken from a synthetic fire due to the lack of a complete set of experimental data for computing radiation for large and fully turbulent fires. These quantities were generated by a code that has been shown to agree well with the limited quantity of relevant data in the literature. Reference solutions to the governing equation were determined using the Monte Carlo method and a ray-tracing scheme with high angular resolution. Solutions using the discrete transfer method {(DTM),} the discrete ordinates method {(DOM)} with both S4 and {LC11} quadratures, and a moment model using the M1 closure were compared to the reference solutions in both isotropic and anisotropic regions of the computational domain. Inside the fire, where radiation is isotropic, all methods gave comparable results with good accuracy. Predictions of {DTM} agreed well with the reference solutions, which is expected for a technique based on ray tracing. {DOM} {LC11} was shown to be more accurate than the commonly used S4 quadrature scheme, especially in anisotropic regions of the fire domain. On the other hand, {DOM} S4 gives an accurate source term and, in isotropic regions, correct fluxes. The M1 results agreed well with other solution techniques and were comparable to {DOM} S4. This represents the first study where the M1 method was applied to a combustion problem occurring in a complex three-dimensional geometry. Future applications of M1 to fires and similar problems are recommended, considering its similar accuracy and the fact that it has significantly lower computational cost than {DOM} S4. Keywords: Fire; Radiation; Discrete ordinates; Discrete transfer; Monte Carlo; Ray tracing; M1 model }, doi = {10.1016/j.combustflame.2006.09.008}, file = {:Jensen2007.pdf:PDF}, keywords = {Discrete ordinates, Discrete transfer, Fire, M1 model, Monte Carlo, Radiation, Ray tracing}, owner = {poitou}, timestamp = {2009.07.29}, url = {http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V2B-4MWXTG3-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fe9f41e6a8d33a89f7a24639f62dd262} } @PHDTHESIS{th_david, author = {D. Joseph}, title = {Modélisation des transferts radiatifs en combustion par méthode aux ordonnées discrètes sur des maillages non structurés tridimensionnels}, school = {Institut National Polytechnique de Toulouse}, year = {2004}, abstract = {La prédiction des concentrations d'espèces polluantes, telles que les suies et oxydes d'azote, émises par les systèmes de combustion et l'évaluation de la durée de vie des parois de ce type d'installation nécessitent une bonne prise en compte des transferts radiatifs dans les modèles de combustion. Dans cette optique, nous avons développé un code de calculs des transferts radiatifs basé sur la Méthode aux Ordonnées Discrètes et utilisant des maillages non structurés de la dynamique des fluides. Le rayonnement des gaz de la combustion est pris en compte par un modèle statistique à bandes étroites en k-corrélés. Divers types de quadratures angulaires et trois schémas de dérivation spatiale différents ont été intégrés et comparés. Des tests de validation ont permis de montrer les limites à fortes épaisseurs optiques de l'approximation de type volumes finis sur laquelle s'appuie la méthode aux ordonnées discrètes. Les premiers calculs effectués sur des solutions obtenues par LES permettent de déterminer les termes sources radiatifs et les flux incidents aux parois instantanés, ce qui permet d'envisager le couplage avec la combustion.}, file = {:th_david.pdf:PDF}, keywords = {Transferts radiatifs - Combustion - Maillage non structuré - Méthode aux ordonnées discrètes - Modèle de rayonnement des gaz}, owner = {poitou}, timestamp = {2011.10.21}, url = {http://ethesis.inp-toulouse.fr/archive/00000016/} } @INPROCEEDINGS{Joseph2003, author = {Joseph, D. and Coelho, P. J. and Cuenot, B. and Hafi, M. El}, title = {Application of the discrete ordinates method to grey media in complex geometries using 3-dimensional unstructured meshes}, booktitle = {Eurotherm73 on Computationnal Thermal Radiation in Participating Media}, year = {2003}, volume = {11}, pages = {97-106}, address = {Mons (Belgium)}, organization = {Eurotherm series}, file = {:Joseph2003.pdf:PDF}, owner = {poitou}, timestamp = {2009.07.29} } @ARTICLE{Joseph2005, author = {D. Joseph and M. El Hafi and R. Fournier and B. Cuenot}, title = {Comparison of three spatial differencing schemes in discrete ordinates method using three-dimensional unstructured meshes}, journal = {International Journal of Thermal Sciences}, year = {2005}, volume = {44}, pages = {851--864}, number = {9}, month = sep, abstract = {A radiative heat transfer code based on the discrete ordinates method applied to unstructured grids has been developed to be coupled with a finite volume {CFD} code for combustion applications. The constraints are that: (1) Accurate coupling with a finite volume {CFD} code requires that the output is the integrated radiative source term within each mesh; (2) The resulting computation times must remain acceptable within the combustion requirements (of the order of an hour for realistic industrial geometries); (3) the line spectra of combustion gases must be accurately represented across the whole infrared range. Here, gaseous line spectra properties are represented with the {SNB-ck} model using narrow bands parallelization. The radiative transfer equation is discretized with a finite volume approach and three schemes are tested (“exponentialâ€, “step†and “diamond mean fluxâ€) in terms of accuracy and computational requirement. They are first tested for academic gray cases, solutions being compared to reference solutions provided by the Ray Tracing Method and the Monte Carlo Method. The behavior of the three schemes is also discussed for a spherical geometry, using an analytical solution in order to perform a parametric study of the absorption optical thickness influence in a wide range typical of spectral line gaseous radiation. Final tests involving a complete water vapor spectrum are performed in order to test the effects of preceding conclusions in terms of expected accuracies for combustion applications. Keywords: Radiative transfer; Infrared line spectra; Discrete ordinates; Unstructured grids; Three-dimensional }, doi = {10.1016/j.ijthermalsci.2005.02.010}, file = {:Joseph2005.pdf:PDF}, keywords = {Discrete ordinates, Infrared line spectra, Radiative transfer, Three-dimensional, Unstructured grids}, owner = {poitou}, timestamp = {2009.07.29}, url = {http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VT1-4FY9MH1-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=03b08cc8d31c1704d197deb6b3ad6ff7} } @ARTICLE{JHT, author = {D. Joseph and P. Perez and M. El Hafi and B. Cuenot}, title = {{Discrete Ordinates} and {Monte-Carlo Methods} for Radiative Transfer Simulation Applied to Computational Fluid Dynamics Combustion Modeling}, journal = {Journal of Heat Transfer}, year = {2009}, volume = {131}, pages = {052701--9}, number = {5}, month = may, doi = {10.1115/1.3013832}, file = {:JHT.pdf:PDF}, keywords = {chemically reactive flow,combustion,computational fluid dynamics,finite volume methods,heat {transfer,Monte} Carlo methods,radiative transfer}, owner = {poitou}, timestamp = {2011.10.21}, url = {http://link.aip.org/link/?JHR/131/052701/1} } @PHDTHESIS{Pedot2012, author = {Pedot, T.}, title = {Modélisation du couplage thermique entre la combustion et l'encrassement des tubes dans un four de raffinerie}, school = {Institut National Polytechnique de Toulouse}, year = {2012}, owner = {poitou}, timestamp = {2011.11.30} } @ARTICLE{Pedot2010, author = {Pedot, T. and Riber, E. and Cuentot ,B.}, title = {Coupled heat transfers in a refinery furnace in view of fouling prediction}, year = {2012}, note = {Applied Thermal Engineering}, owner = {poitou}, timestamp = {2011.11.30} } @ARTICLE{Pedot2010a, author = {Pedot, T. and Riber, E. and Cuentot ,B.}, title = {Coupled heat transfers in a refinery furnace in view of fouling prediction}, year = {2012}, note = {IJHMT}, owner = {poitou}, timestamp = {2011.11.30} } @ARTICLE{NHT2, author = {P. Perez and M. El Hafi and P. J. Coelho and R. Fournier}, title = {Accurate solutions for radiative heat transfer in two-dimensional axisymmetric enclosures with gas radiation and reflective surfaces}, journal = {Numerical Heat Transfer, Part B: Fundamentals}, year = {2004}, volume = {47}, pages = {39 -- 63}, number = {1}, abstract = {Accurate solutions for benchmarking purposes in two-dimensional axisymmetric enclosures with reflective surfaces have been obtained using the Monte Carlo method {(MCM)} based on the net exchange formulation {(NEF).} Previous applications of the {MCM-NEF} have been restricted to multidimensional problems with black boundaries or one-dimensional problems with gray boundaries. Here, the extension to multidimensional enclosures with gray boundaries is presented. The medium is a mixture of {H{\textless}sub{\textgreater}2{\textless}/sub{\textgreater}O,} {CO{\textless}sub{\textgreater}2{\textless}/sub{\textgreater},} N{\textless}sub{\textgreater}2{\textless}/sub{\textgreater}, and soot at atmospheric pressure, and its radiative properties are computed using the correlated {\textless}b{\textgreater}{\textless}i{\textgreater}k{\textless}/i{\textgreater}{\textless}/b{\textgreater}-distribution method. Predictions obtained using the discrete ordinates method are included, showing good agreement with the benchmark {MCM/NEF} solutions.}, file = {:NHT2.pdf:PDF}, owner = {poitou}, timestamp = {2009.05.12}, url = {http://www.informaworld.com/10.1080/10407790490515639} } @PHDTHESIS{th_poitou, author = {D. Poitou}, title = {Modélisation du rayonnement dans la simulation aux grandes échelles de la combustion turbulente}, school = {Institut National Polytechnique de Toulouse}, year = {2009}, month = {Décembre}, abstract = {Résumé : La simulation de la combustion turbulente connaît un nouvel essor avec l'introduction de la Simulation aux Grandes Échelles (SGE) qui permet de prédire l'évolution instationnaire de l'écoulement réactif turbulent. Dans ce contexte la prise en compte du rayonnement soulève des questions d'ordre à la fois fondamental et pratique. En effet les processus physiques du rayonnement et de la combustion sont de nature radicalement différente~: la combustion est contrôlée par des échanges locaux sur une durée finie, alors que le rayonnement est instantané et fait intervenir des échanges à distance. En premier lieu il convient de s'interroger sur l'impact de la modélisation SGE de la combustion turbulente sur le rayonnement. Cette question est traitée dans le cadre plus général de l'interaction rayonnement-turbulence. A partir d'études théoriques et numériques, il est montré que cette interaction est faible et qu'une solution SGE peut être directement utilisée pour un calcul radiatif, sans modélisation supplémentaire. Il s'agit ensuite de mettre en place de façon pratique le couplage instationnaire rayonnement-combustion turbulente. Un point clé est la réduction du temps de calcul pour le rayonnement, et diverses stratégies sont proposées. En particulier un nouveau modèle spectral est introduit, utilisant une technique de tabulation et garantissant un niveau de précision suffisant. Le temps de calcul radiatif a ainsi été réduit de deux ordres de grandeur, permettant la réalisation d'un calcul couplé sur une configuration de flamme prémélangée turbulente. Abstract : Simulation of turbulent combustion has gained high potential with the Large Eddy Simulation (LES) approach, allowing to predict unsteady turbulent reactive flows. In this context, taking into account radiation rises new fundamental and practical questions. Indeed the physics involved in radiation and in combustion are completely different: combustion is controlled by local exchanges and finite times whereas radiation is instantaneous and is based on non-local exchanges. In a first step, the impact of LES modelling of turbulent combustion on radiation is regarded. This question is treated in the more general frame of the turbulence-radiation interaction. From theoretical and numerical studies, it is shown that this interaction is weak in the LES context so that LES solutions can be directly coupled to radiative calculations, without further modelling. Then the unsteady coupling of radiation and turbulent combustion is realised. A key point is the reduction of calculation time of radiation, and several strategies are proposed. In particular a new global spectral model is introduced, using a tabulation technique and ensuring a sufficient level of accuracy. The radiative time calculation is finally decreased by two orders of magnitude, enabling the realization of a coupled calculation of a turbulent premixed flame.}, citeseerurl = {http://ethesis.inp-toulouse.fr/archive/00001019/01/poitou.pdf}, file = {:th_poitou.pdf:PDF}, keywords = {Combustion turbulente, Simulations aux Grandes Échelles, Transfert radiatif, Modèles spectraux globaux, Ordonnées discrètes, Couplage, Interaction Rayonnement-Turbulence Turbulent combustion, Large Eddy Simulation, Radiative transfer, Global spectral models, Discrete ordinate, Coupling, Turbulence-Radiation Interaction}, owner = {poitou}, timestamp = {2010.02.09}, url = {http://ethesis.inp-toulouse.fr/archive/00001019/01/poitou.pdf} } @INPROCEEDINGS{poitou_euro, author = {Poitou, D. and Amaya, J. and Bushan Singh, C. and Joseph, D. and Hafi, M. El and Cuenot, B.}, title = {Validity limits for the global model {FS-SNBcK} for combustion applications}, booktitle = {Proceedings of Eurotherm83 -- Computational Thermal Radiation in Participating Media III}, year = {2009}, abstract = {In this work the Full Spectrum based on the Statistical Narrow Band with the correlated k approxi- mation (FS-SNBcK) is presented. The idea behind the model is to group the narrow bands using the Malkmus model, in order to build a Full Spectrum representation of the space of frequencies. All narrow bands are grouped and weighted by the Planck function to take into account the variation of the blackbody intensity over the whole spectrum. In this paper, validity limits of the model are studied, using a one dimensional isothermal homogeneous gas layer. The influence of species con- centration, layer thickness and temperature are tested. An detailed mathematical formulation of the model is presented. Finally, 3D simulations were performed to check the efficiency of the model against other spectral methods.}, file = {:RADIATION2009-POITOU_et_al.pdf:PDF}, owner = {poitou}, timestamp = {2009.05.29} } @ARTICLE{Poitou2012, author = {D. Poitou and J. Amaya and F. Duchaine}, title = {Parallel computation for the radiative heat transfer using the {DOM} in combustion applications: direction, frequency, sub-domain decompositions and hybrid methods}, journal = {Numerical Heat Transfer, Part B Fundamentals}, year = {2012}, volume = {62-1}, owner = {poitou}, timestamp = {2012.07.06} } @ARTICLE{Poitou2011b, author = {Poitou, D. and Amaya, J. and Hafi, M. El and Cuenot, B.}, title = {Analysis of the interaction between turbulent combustion and thermal radiation using unsteady coupled LES/DOM simulations}, journal = {Combustion and Flame}, year = {2011}, file = {:Poitou2011b.pdf:PDF}, owner = {poitou}, timestamp = {2011.05.05} } @ARTICLE{Poitou2010, author = {Poitou, D. and El Hafi, M. and Cuenot, B.}, title = {Analysis of Radiation Modeling for Turbulent Combustion: Development of a Methodology to Couple Turbulent Combustion and Radiative Heat Transfer in {LES}}, journal = {Journal of Heat Transfer}, year = {2010}, volume = {133}, pages = {062701--10}, number = {6}, month = jun, abstract = {Radiation exchanges must be taken into account to improve Large Eddy Simulation (LES) prediction of turbu- lent combustion, in particular for wall heat fluxes. Because of its interaction with turbulence and its impact on the formation of polluting species, unsteady coupled calculations are required. This work constitutes a first step towards coupled LES-radiation simulations, selecting the optimal methodology based on systematic comparisons of accuracy and CPU cost. Radiation is solved with the Discrete Ordinate Method (DOM) and different spec- tral models. To reach the best compromise between accuracy and CPU time, the performance of various spectral models and discretizations (angular, temporal and spatial) is studied. It is shown that the use of a global spectral model combined with a mesh coarsening (compared to the LES mesh) and a minimal coupling frequency Nit allows to compute one radiative solution faster than Nit LES iterations, while keeping a good accuracy. It also appears than the impact on accuracy of the angular discretization in the DOM is very small compared to the impact of the spectral model. The determined optimal methodology may be used to perform unsteady coupled calculations of turbulent combustion with radiation.}, doi = {10.1115/1.4003552}, file = {:Poitou2011.pdf:PDF}, keywords = {combustion, flow simulation, heat transfer, Radiative transfer, turbulence}, owner = {poitou}, timestamp = {2010.10.11}, url = {http://link.aip.org/link/?JHR/133/062701/1} } @ARTICLE{poitou_TRI, author = {Poitou, D. and Hafi, M. El and Cuenot, B.}, title = {Diagnosis of {Turbulence Radiation Interaction} in Turbulent Flames and Implications for Modeling in {Large Eddy Simulation}}, journal = {Turkish Journal of Engineering and Environmental Sciences}, year = {2007}, volume = {31}, pages = {371-381}, abstract = {An a priori study of the turbulence radiation interaction (TRI) is performed on numerical data from Direct Numerical Simulation (DNS) of a turbulent flame. The influence of the various correlations that appear in the radiative emission is investigated and their impact is evaluated in the context of Large Eddy Simulation (LES). In LES, only filtered quantities are computed, where the filter is the grid. The radiative emission is reconstructed first from the exact, then filtered solution variables and the sensitivity to the filter size is evaluated. Three approaches are used to take into account the subgrid scale correlations: the no-TRI, partial TRI and full TRI approaches. Results show that the full TRI is exact compared to the reference emission and that the partial TRI performs worse than the no-TRI for the studied configuration. This indicates that in the studied case, the TRI must be considered in LES in a full formulation.}, file = {:poitou_TRI.pdf:PDF}, owner = {poitou}, timestamp = {2009.05.29} } @comment{jabref-meta: selector_publisher:} @comment{jabref-meta: selector_author:} @comment{jabref-meta: selector_journal:} @comment{jabref-meta: selector_keywords:}