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(Abbreviated) In this paper we report on the development of a multiscalemethod for simulating complex liquid-liquid systems such as water in contactwith oil containing asphaltenes. We consider simulations where water dropscovered with asphaltenes are deflated, and reproduce the crumpling observed inexperiments. The method on the nanoscale is based on using coarse-grainedmolecular dynamics simulations of the interface, with an accurate model for theasphaltene molecules. This enables the calculation of interfacial properties.These properties are then used in the macroscale simulation, which is performedwith a two-phase incompressible flow solver using a novel hybridlevel-set/ghost-fluid/immersed-boundary method for taking the complex interfacebehaviour into account. We validate both the nano- and macroscale methods.Results are presented from nano- and macroscale simulations which showcase someof the interesting behaviour caused by asphaltenes affecting the interface. Themolecular simulations presented here are the first in the literature to obtainthe correct interfacial orientation of asphaltenes. Results from the macroscalesimulations present a new physical explanation of the crumpled drop phenomenon,while highlighting shortcomings in previous hypotheses.

A multiscale method for simulating fluid interfaces covered with large molecules such as asphaltenes