Exploring different approaches for the simulation of multi-scale atomization process

International audienceA big effort has been made in the last decades to try to numerically simulate multiphase flows and specifically the atomization process. This has become a key topic for aeronautical application, as the combustion process must be optimized in order to reduce pollutant emission. Despite this effort, there is not a global approach capable of simulating the entire atomization process, starting from the nozzle up to the disperse phase region. The first part of this work deals with the design of a simple configuration able to reproduce high Weber and Reynolds numbers of industrial interest, on which DNS computation can be performed. The second part introduces the comparison of the DNS experiments results with the ones of simulations performed with two reduced order models. The comparison addresses the topology (liquid core length, penetration study), the first and the second order statistics in the diffuse interface zone, in order to have for the first time a common test case to evaluate advantages and effects of different modelling strategies