Large eddy simulations for hydrogen combustion modelling. Applications to ballistic base drag reduction units and nuclear accident sequence analysis

Resumen

Resumen de la tesis: In this work, Computational Fluid Dynamics (CFD) simulations using Large Eddy Simulation (LES) turbulence modeling are proposed for analyzing problems where traditionally Reynolds Averaged Navier Stokes Equations (RANS) have been extensively used, but with results that did not find good agreement when compared with experimental data. This work is focused on two problems: external ballistics for slender bodies with drag reduction (Base Bleed) units, and nuclear accident sequences. CFD models to estimate the drag coefficient of slender bodies with spin and Base Bleed technology under transonic and supersonic (Mach number 0.99–1.5) quasi-steady conditions. On the other hand, the modelling of premixed combustion in three-dimensional confined scenarios is also studied in this work. LES models have been proposed and assessed for predicting flame combustion acceleration and interaction in the presence of turbulence. http://repositorio.bib.upct.es/dspace/