The Barcelona Supercomputing Center - Centro Nacional de Supercomputación (BSC-CNS) is the leading supercomputing center in Spain. It houses Mare Nostrum, one of the most powerful supercomputers in Europe, was a founding and hosting member of the former European HPC infrastructure PRACE (Partnership for Advanced Computing in Europe), and is now hosting entity for Euro HPC JU, the Joint Undertaking that leads large-scale investments and HPC provision in Europe. The mission of BSC is to research, develop and manage information technologies in order to facilitate scientific progress. BSC combines HPC service provision and R&D into both computer and computational science (life, earth and engineering sciences) under one roof, and currently has over 1000 staff from 60 countries.

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The future of the aerial transportation industry relies on developing new technologies which are more environmentally friendly. Among other concepts, supersonic devices operating with hydrogen fuel offer an attractive alternative to conventional airplanes. The use of hydrogen directly mitigates emissions of CO (pollutant) and CO2 (greenhouse warming gas), while hypersonic flight for commercial transport will considerably reduce the travelling time among destinations. Nevertheless, combustion at hypersonic regimes, found in propulsion concepts such as scramjets, is still on its early developments, and a better understanding is needed so that technology can be developed and used in commercial applications. Experimental tests are of limited use for research and technology transfer, since the use of diagnostics in high-speed combustion find several limitations, hence not providing all the necessary data for its study. In this sense, the use of numerical simulations of reactive flows, in particular with Large Eddy Simulations (LES), present an attractive alternative for accessing all kinds of non-stationary data. Nevertheless, the application of LES methodologies to hypersonic problems requires a careful treatment of the Navier-Stokes equations from a numerical perspective, as needs also a proper integration of combustion models to study reactive applications. Experimental tests are of limited use for research and technology transfer, since the use of diagnostics in high-speed combustion find several limitations, hence not providing all the necessary data for its study. In this sense, the use of numerical simulations of reactive flows, in particular with LES, present an attractive alternative for accessing all kinds of non-stationary data. Nevertheless, the application of LES methodologies to hypersonic problems requires a careful treatment of the Navier-Stokes equations and proper integration of thermochemistry of non-equilibrium flows.

The objective of this project is to develop a numerical methodology for compressible flow simulations in LES. The methodology, to be integrated in the in-house solver Alya, will be coupled to tabulated chemistry using the Flamelet Progress Variable (FPV) approach for modelling combustion. The solver will be validated with canonical problems relevant to supersonic combustion, and will be applied to high-speed flows and plumes.

The research team that the applicant will be involved is the Propulsion Technologies Group at CASE Department of BSC. The team is a multidisciplinary group with researchers from all disciplines and with strong background in Computational Fluid Dynamics (CFD). The team is involved in many EU and industrial projects related to this topic, where the successful activities and the publications on highly ranked scientific journals give the proved expertise.