  Despite decades of research, the modeling of moving contact lines has
remained a formidable challenge in fluid dynamics whose resolution will impact
numerous industrial, biological, and daily life applications. On the one hand,
molecular dynamics (MD) simulation has the ability to provide unique insight
into the microscopic details that determine the dynamic behavior of the contact
line, which is not possible with either continuum-scale simulations or
experiments. On the other hand, continuum-based models provide a link to the
macroscopic description of the system. In this Feature Article, we explore the
complex range of physical factors, including the presence of surfactants, which
governs the contact line motion through MD simulations. We also discuss links
between continuum- and molecular-scale modeling and highlight the opportunities
for future developments in this area.
