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@ARTICLE{AR-CFD-21-61, author = {Malé, Q. and Vermorel, O. and Ravet, F. and Poinsot, T. }, title = {Jet Ignition Prediction in a Zero-Dimensional Pre-Chamber Engine Model}, year = {2021}, doi = {10.1177/14680874211015002}, journal = {International Journal of Engine Research}, abstract = {This paper presents a multi-chamber, multi-zone engine model to predict the ignition of a lean main chamber by a pre-chamber. The two chambers are connected by small cylindrical holes: the flame is ignited in the pre-chamber, hot gases propagate through the holes and ignite the main chamber through Turbulent Jet Ignition (TJI). The model original features are: i) separate balance equations for the pre- and main chambers, ii) a specific model for temperature and composition evolution in the holes and iii) a DNS-based model 1 to predict the ignition of the main chamber fresh gases by the burnt gases turbulent jets exiting the holes. Chemical reactions during TJI are the result of two competing mixing processes: (1) the hot jet gases mix with the fresh main chamber to produce heated zones and (2) at the same time, these hot gases cool down. (1) increases combustion and leads to ignition while (2) decreases it and can prevent ignition. The overall outcome (ignition or failure) is too complex to be modelled simply and the present model relies on recent DNSs of TJI1 which provided a method to predict the occurrence of ignition. Incorporating this DNS information into the engine model allows to predicts whether ignition will occur or not, an information which is not accessible otherwise using simple models. The resulting approach is tested on multiple cases to predict ignition limits for very lean cases, e↵ects of H2 injection into the pre-chamber and optimum size for the holes connecting the two chambers as a function of equivalence ratio.}, keywords = {turbulent jet ignition, pre-chamber ignition, internal combustion engine, multi-zone engine model}, url = {https://doi.org/10.1177/14680874211015002}}

@ARTICLE{AR-CMGC-21-63, author = {Schauberger, B. and Makowski, D. and Ben-Ari, T. and Boé, J. and Ciais, P. }, title = {No historical evidence for increased vulnerability of French crop production to climatic hazards}, year = {2021}, volume = {306}, pages = {108453}, doi = {10.1016/j.agrformet.2021.108453}, journal = {Agricultural and Forest Meteorology}, pdf = {https://cerfacs.fr/wp-content/uploads/2021/05/GlobC_Article-Scauberger-No-historical-evidence-for-increased-vulnerability-of-French.pdf}}

@ARTICLE{AR-PA-21-65, author = {Jang, Y. and Shaw, S. }, title = {A priori error analysis for a finite element approximation of dynamic viscoelasticity problems involving a fractional order integro-differential constitutive law}, year = {2021}, number = {46}, volume = {47}, doi = {10.1007/s10444-021-09857-8}, journal = {Advances in Computational Mathematics}, pdf = {https://link.springer.com/article/10.1007/s10444-021-09857-8}}

@ARTICLE{AR-CFD-21-53, author = {Renard, F. and Feng, Y. and Boussuge, J.-F. and Sagaut, P. }, title = {Improved compressible hybrid lattice Boltzmann method on standard lattice for subsonic and supersonic flows}, year = {2021}, number = {April 2021}, volume = {219}, pages = {104867 }, issn = {0045-7930}, doi = {10.1016/j.compfluid.2021.104867}, abstract = {A D2Q9 Hybrid Lattice Boltzmann Method (HLBM) is proposed for the simulation of both compressible subsonic and supersonic flows. This HLBM is an extension of the model of Feng et al. [1], which has been found, via different test cases, to be unstable for supersonic regimes. To circumvent this limitation, we propose:: (1) a new discretization of the lattice closure correction term that makes possible the simulation of supersonic flows, (2) a corrected viscous stress tensor that takes into account polyatomic gases, and (3) a novel discretization of the viscous heat production term fitting with the regularized formalism. The result is a hybrid method that resolves the mass and momentum equations with an LBM algorithm, and resolves the entropy-based energy equation with a finite volume method. This approach fully recovers the physics of the Navier–Stokes–Fourier equations with the ideal gas equation of state, and is valid from subsonic to supersonic regimes. It is then successfully assessed with both smooth flows and flows involving shocks. The proposed model is shown to be an efficient, accurate, and robust alternative to classic Navier–Stokes methods for the simulation of compressible flows}, keywords = {LBM, Compressible High speed flow, Shock waves, Aerodynamic noise}}

@ARTICLE{AR-PA-21-45, author = {Mohanamuraly, P. and Müller, J.D. }, title = {An Adjoint‐assisted Multilevel Multifidelity Method for Uncertainty Quantification And Its Application To Turbomachinery Manufacturing Variability}, year = {2021}, number = {9}, volume = {122}, pages = {2179-2204}, doi = {10.1002/nme.6617}, journal = {International Journal for Numerical Methods in Engineering}, keywords = {Multilevel Multifidelity Monte Carlo, Uncertainty Quantification, Goalbased PCA, Adjoint Sensitivity, Manufacturing Variations}, pdf = {https://doi.org/10.1002/nme.6617}}