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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

MODELING AERODYNAMIC BREAKUP OF LIQUID DROPS IN A GAS FLOW WITH MOLECULAR DYNAMICS ANALOGY METHODS

Alexander L. Brown
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

Flint Pierce
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

Abstract

The breakup of liquid drops is an important phenomenology for many applications. We approach this problem with the objective to improve methods for handling the modeling of the impulse and impact dispersal of liquids in transportation accident scenarios. These scenarios can be distinguished from many other simpler problems, due to the quantity of liquid and the complexity of the intermediate liquid morphology. These differences necessitate alternative approaches to the problem. We have recently implemented a model for inter-particle forces between particles in a Lagrangian/Eulerian CFD code. The inter-particle force model is inspired by molecular dynamics methods, and employs a Lennard-Jones (LJ) attractive force and a spring-based repulsive force. The LJ parameters are related to the bulk fluid properties through a theoretical relationship model. Methods are necessary for modifying the single particle aerodynamic drag term, depending on the new notion of particle connectivity. We want to evaluate these methods for potential utilization in practical simulations. Classical breakup tests for drops in flows suggest a critical Weber number relating to the onset of breakup for a drop. We seek to replicate these data with our model methods as a preliminary step before deploying the method in larger scale practical environments.

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