50 research outputs found
Les librettistes de Rameau, de Pellegrin à Cahusac
Van Den Heuvel J., Haeringer E. Les librettistes de Rameau, de Pellegrin à Cahusac. In: Cahiers de l'Association internationale des études francaises, 1989, n°41. pp. 177-185
La refondation mégapolitaine : une nouvelle phase de l'histoire urbaine ? 1. L'Eurasie post-communiste : Moscou, Shanghai, Hongkong
La langue contrôlée et l'interface "LiSe" : des outils linguistiques développés en Franche-Comté / Bourgogne pour l'aide à la gestion des crises sanitaires
International audienc
Incompressible versus compressible large eddy simulation for the identification of premixed flame dynamics
The present work compares the respective advantages and disadvantages of compressible and incompressible computational fluid dynamics (CFD) formulations when used for the estimation of the acoustic flame response. The flame transfer function of a turbulent premixed swirl-stabilized burner is determined by applying system identification (SI) to time series data extracted from large eddy simulation (LES). By analyzing the quality of the results, the present study shows that incompressible simulations exhibit several advantages over their compressible counterpart with equal prediction of the flame dynamics. On the one hand, the forcing signals can be designed in such a way that desired statistical properties can be enhanced, while maintaining optimal values in the amplitude. On the other hand, computational costs are reduced and the implementation is fundamentally simpler due to the absence of acoustic wave propagation and corresponding resonances in the flame response or even self-excited acoustic oscillations. Such an increase in efficiency makes the incompressible CFD/SI modeling approach very appealing for the study of a wide variety of systems that rely on premixed combustion. In conclusion, the present study reveals that both methodologies predict the same flame dynamics, which confirms that incompressible simulation can be used for thermoacoustic analyses of acoustically compact velocity-sensitive flames
Decentralized job matching
This paper studies a multi-stage decentralized matching model where firms sequentially propose their (unique) positions to workers. At each stage workers sequentially decide which offer to accept (if any). A firm whose offer has been declined may make an offer to another worker in the next stage. The game stops when all firms either have been matched to a worker or have already made unsuccessful offers to any worker remaining in the market. We show that there is a unique subgame-perfect equilibrium outcome, the worker-optimal matching. Firms in this game have a weakly dominant strategy, which consists of making offers in the same order as given by their preferences. When workers play simultaneously any stable matching can be obtained as an equilibrium outcome, but an unstable matching can obtain in equilibrium