  Fabrication of highly ordered and dense nanofibers assemblies is of key
importance in designing high-performance and multi-functional materials. In
this work, we design an experimental approach in silico, combining shear flow
and solvent evaporation to establish nanofiber alignment and densification of
the assemblies. We demonstrate the feasibility of this approach by performing
dissipative particle dynamics simulations, where the hydrodynamic and thermal
fluctuation effects are fully modeled. We find that the microstructural order
of assembled nanofibers can be established within a specific range of the
Peclet number and evaporation flux. The underlying mechanism is elucidated by
considering the competition between hydrodynamic coupling and fluctuating
dynamics of nanofibers. Based on these understandings, we outline a practical
setup to fabricate highly ordered and dense nanofiber assemblies.
