Assessment of PFEM to solve primary atomization problems

NIGRO NORBERTO; GIMENEZ JUAN; IDELSOHN, SERGIO; MARQUEZ DAMIAN, SANTIAGO; AGUERRE HORACIO; RAMAJO DAMIAN

Venecia

Congreso; VI International Conference on Coupled Problems in Science and Engineering; 2015

ECCOMAS-IACM

Primary atomization of a liquid charge injected at high speed into still gaseous chamber isinvestigated to get insight about the physical processes involved and the capabilities ofnumerical methods to track them. This work was originally published by Menard andcollaborators [1] and subsequently the discussion continued with the work of Shinjo andUmemura [2] where in the latter authors question that the first job has represented the DNSof the first structures of the atomization.As it was presented in [2] the authors show a numerical simulation using utmost 6 billioncells with sufficient grid resolution to capture the first ligaments and their consecutivedroplet formation with results that are physically sound way. Also the authors show thatligament formation is triggered by the liquid jet tip roll-up, and later ligaments are alsoproduced from the disturbed liquid core surface in the upstream promoted by Kelvin-Helmholtz (KH) and Rayleigh-Taylor (RT) mechanisms. Ligament production at the jet tip isaffected by the surrounding gas vortices with further droplet collision. The greater the localgas Weber number the smaller the scale of the ligaments or droplets being formed.In [2] some comparison with laboratory experiments is shown serving as the basis for theassessment of future numerical simulations around this physical phenomenon.In the present work we focus on the capabilities of the Particle Finite Element Method (PFEM) in itssecond generation [3], to reproduce such a problem, following the physical phenomena established inprevious works, matching the experimentally measured droplet distribution and comparing againstanother Eulerian type solver working on similar meshes. An extra bonus of this work is theunderstanding of the interface dynamics and its impact on the interface capturing process insidePFEM.