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Renard, F., Wissocq, G., Boussuge, J. -F. and Sagaut, P. (2021) A linear stability analysis of compressible hybrid lattice Boltzmann methods, Journal of Computational Physics, 446, pp. 110649, doi:10.1016/j.jcp.2021.110649

[bibtex] [url] [doi]

@ARTICLE{AR-CFD-21-105, author = {Renard, F. and Wissocq, G. and Boussuge, J.-F. and Sagaut, P. }, title = {A linear stability analysis of compressible hybrid lattice Boltzmann methods}, year = {2021}, volume = {446}, pages = {110649}, doi = {10.1016/j.jcp.2021.110649}, journal = {Journal of Computational Physics}, abstract = {An original spectral study of the compressible hybrid lattice Boltzmann method (HLBM) on standard lattice is proposed. In this framework, the mass and momentum equations are addressed using the lattice Boltzmann method (LBM), while finite difference (FD) schemes solve an energy equation. Both systems are coupled with each other thanks to an ideal gas equation of state. This work aims at answering some questions regarding the numerical stability of such models, which strongly depends on the choice of numerical parameters. To this extent, several one- and two-dimensional HLBM classes based on different energy variables, formulations (primitive or conservative), collision terms and numerical schemes are scrutinized. Once appropriate corrective terms introduced, it is shown that all continuous HLBM classes recover the Navier-Stokes-Fourier behavior in the linear approximation. However, striking differences arise between HLBM classes when their discrete counterparts are analyzed. Multiple instability mechanisms arising at relatively high Mach number are pointed out and two exhaustive stabilization strategies are introduced: (1) decreasing the time step by changing the reference temperature and (2) introducing a controllable numerical dissipation Ïƒ via the collision operator. A complete parametric study reveals that only HLBM classes based on the primitive and conservative entropy equations are found usable for compressible applications. Finally, an innovative study of the macroscopic modal composition of the entropy classes is conducted. Through this study, two original phenomena, referred to as shear-to-entropy and entropy-to-shear transfers, are highlighted and confirmed on standard two-dimensional test cases.}, keywords = {HLBM, LSA, compressible}, url = {https://www.sciencedirect.com/science/article/pii/S0021999121005441}}

Cuenot, B., Shum Kivan, F. and Blanchard, S. (2021) The thickened flame approach for non-premixed combustion: Principles and implications for turbulent combustion modeling, Combustion and Flame, pp. 111702, doi:10.1016/j.combustflame.2021.111702

[bibtex] [url] [doi]

@ARTICLE{AR-CFD-21-136, author = {Cuenot, B. and Shum Kivan, F. and Blanchard, S. }, title = {The thickened flame approach for non-premixed combustion: Principles and implications for turbulent combustion modeling}, year = {2021}, pages = {111702}, doi = {10.1016/j.combustflame.2021.111702}, journal = {Combustion and Flame}, abstract = {Modeling turbulent non-premixed combustion remains a challenge in the context of Large Eddy Simula- tion (LES) in complex geometries and for realistic conditions, taking into account all physical phenomena impacting the flame such as heat loss, dilution, or liquid fuel atomization and evaporation. In this work, the Thickened Flame concept, which allows to resolve the flame front on the LES grid while preserving the consumption speed, and initially derived for premixed combustion, is adapted to diffusion flames. It is demonstrated that the concept holds for these flames, with however, a different formulation of the model due to but their specific nature and properties. In particular, in the high-DamkÃ¶hler regime, the thickening factor is applied only to the diffusion coefficients. The behavior of thickened diffusion flames is illustrated on laminar steady strained flames for both simple and complex chemistry, showing how the Thickened Flame concept applies. Based on these re sults, an expression for the thickening factor related to mesh coarsening is derived. For a complete turbulent combustion model, the thickening factor should also describe the sub-grid scale flame-turbulence interaction, which is left for future work.}, keywords = {Non-premixed combustion, Laminar flame, Turbulent combustion modeling}, url = {https://doi.org/10.1016/j.combustflame.2021.111702}}

Fiore, M., Daroukh, M. and Montagnac, M. (2021) Broadband noise prediction of a counter rotating open rotor based on LES simulation with phase-lagged assumption, Journal of Sound and Vibration, 514, pp. 116420, doi:10.1016/j.jsv.2021.116420

[bibtex] [url] [doi]

@ARTICLE{AR-CFD-21-115, author = {Fiore, M. and Daroukh, M. and Montagnac, M. }, title = {Broadband noise prediction of a counter rotating open rotor based on LES simulation with phase-lagged assumption}, year = {2021}, volume = {514}, pages = {116420}, doi = {10.1016/j.jsv.2021.116420}, journal = {Journal of Sound and Vibration}, abstract = {This paper presents the broadband noise analysis of a Counter Rotating Open Rotor (CROR) configuration. The numerical study is based on a hybrid approach: a Large Eddy Simulation (LES) code solves the near-flow field of the CROR configuration and the near-to-far-field propagation is then predicted by a Ffowcs Williams–Hawkings analogy either based on a solid or porous formulation. The LES solver uses a phase-lagged assumption with a proper orthogonal decomposition for the data storage. The numerical approach is validated against wind tunnel experimental data of a CROR configuration (AI-PX7) at three different operating points focused on the broadband noise. The analysis of the numerical simulations shows the predominant effect of the rear rotor suction side on the radiated broadband noise with an increasing contribution with span location. This source is related to the impingement of front rotor wakes and the development of leading edge vortices that induce large pressure fluctuations close to the leading edge on the suction side.}, keywords = {Counter-rotating open rotor Broadband noise prediction Ffowcs Williams–Hawkings analogy Large-Eddy simulation Phase-lagged assumption POD data storage}, url = {https://www.sciencedirect.com/science/article/abs/pii/S0022460X2100465X}}

Di Pietro, D. A., Hülsemann, F., Matalon, P., Mycek, P., Ruede, U. and Ruiz, D. (2021) An H-Multigrid Method for Hybrid High-Order Discretizations - Special Section Copper Mountain 2020, SIAM Journal on Scientific Computing, doi:10.1137/20M1342471

[bibtex] [url] [doi]

@ARTICLE{AR-PA-21-118, author = {Di Pietro, D.A. and Hülsemann , F. and Matalon, P. and Mycek, P. and Ruede, U. and Ruiz, D. }, title = {An H-Multigrid Method for Hybrid High-Order Discretizations - Special Section Copper Mountain 2020}, year = {2021}, doi = {10.1137/20M1342471}, journal = {SIAM Journal on Scientific Computing}, keywords = {partial differential equations, hybrid high-order, multigrid, static condensation }, url = {https://epubs.siam.org/doi/10.1137/20M1342471}}

Peyron, M., Fillion, A., Gürol, S., Marchais, V., Gratton, S., Boudier, P. and Goret, G. (2021) Latent space data assimilation by using deep learning, Quarterly Journal of the Royal Meteorological Society, doi:10.1002/qj.4153

[bibtex] [url] [doi]

@ARTICLE{AR-PA-21-120, author = {Peyron , M. and Fillion, A. and Gürol, S. and Marchais, V. and Gratton, S. and Boudier, P. and Goret, G. }, title = {Latent space data assimilation by using deep learning}, year = {2021}, doi = {10.1002/qj.4153}, journal = {Quarterly Journal of the Royal Meteorological Society}, url = {https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/qj.4153}}

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