Revisiting Deflagration to Detonation Transition in the context of carbonfree energy production
The use, the storage and the transportation of carbon-free fuels, such as hydrogen, require the control of random and violent combustion phenomena, as the devastating detonation waves. Because performing experiments under such extreme conditions is not an option, actual safety regulation, optimization and design mostly rely on global correlations and numerical simulations. To be relevant, such simulations should accurately describe the strongly transient behaviors characterizing the initiation and the propagation of detonation waves. However, because of the wide range of time and length scales involved in both chemical kinetics and flow physics, actual computer capabilities do not allow, for complex practical systems, to precisely capture the unsteadiness of the inner structure of the wave together with the large scale flow motions. Since this inner structure actually controls the initiation and the dynamics of detonation waves at the largest flow scales, the prediction capabilities of the numerical simulations stays so far limited.
The objective of the project is to set up theoretical models to accurately represent the dynamics of detonations in H2-air mixtures. Physical phenomena pertaining to the inner structure of the waves will be included in the analysis. Used to solve key problems in canonical configurations, the models will be validated by carefully controlled Direct Numerical Simulation (DNS) using the most advanced high-order algorithms. The challenging problems of Deflagration to Detonation Transition (DDT), Direct Initiation of Detonation (DID) and cellular fronts of strongly unstable Cellular Detonations (CD) will be addressed along these lines.
The research group has extensive experience in the context of high-order discontinuous finite elements (DFE) methods for unstructured meshes, with particular emphasis in the development of an MPI parallelized fortran 90 solver for compressible flows, based on the high-order spectral difference (SD) scheme for unstructured hexahedral elements. Recent efforts, in particular, have been focusing in developing robust and efficient shock-capturing approaches which are specifically conceived to be used with DFE schemes.
In view of applications to DNS of detonations, the objective of the proposed PhD Thesis is to develop high-order numerical methods for multicomponent reactive flows in the presence of shocks and discontinuities. The work will involve close collaborations and mutual exchanges with the IRPHE laboratory in Marseille, where state-of-the-art theoretical analyses of the detonation dynamics will be carried out.
The candidate should hold a MSc degree in Engineering (Aeronautical, Mechanical), Physics, Applied Mathematics or other related fields showing evidence of deep knowledge of continuum transport models and numerical methods.
Knowledge in computer language and algorithm development is required. An experience in numerical simulation, high-performance computing, high-order schemes for computational fluid dynamics is a major plus.
Applicants must have good English communications and writing skills as demonstrated through sufficiently high TOEFL/TOEIC scores (or equivalent).
Location : CORIA Laboratory, Rouen, France – www.coria-cfd.fr
Funding : ANR collaborative project.
Duration : 36 months
Contact : Guido Lodato
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