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In this manuscript I summarise the work I have carried out in the last 10years. My research projects are articulated around various fields inastrophysics having, as unifying theme, the 3D modelling and the observation ofstellar atmospheres. In particular, my field of research covers all late typestars, from the Main Sequence stars to the advanced stages (red giant andsupergiant stars). My work is based on the quantitative analysis of images,synthetic spectra, bolometric luminosity, planetary transits of different typesof stars and on the modeling of their atmospheres. They include the use anddevelopment of 3D simunlations that are necessary for the interpretation of thedata obtained with the new instruments equipping the space borne and groundtelescopes. Interferometry and spectroscopy hold a privileged place in myresearch. My research themes concern interdisciplinary aspects by addressingquestions related to atmospheric physics in relation to 3D hydrodynamic models.The predictions thus obtained are used to drive a vast campaign ofinterferometric, astrometric, photometric, spectroscopic and imagingobservations. Finally, 3D simulations are also directly used to drive thedevelopment of new generation instrument at the VLTI, as well as very largefuture observatories and are directly linked to the ESA Gaia and PLATOmissions.

A Journey across the Hertzsprung-Russell diagram with 3D hydrodynamical simulations of cool stars