Anisotropic imbibition on surfaces patterned with polygonal posts
  We present and interpret lattice Boltzmann simulations of thick films spreading on surfaces patterned with polygonal posts. We show that the mechanism of pinning and depinning differs with the direction of advance, and demonstrate that this leads to anisotropic spreading within a certain range of material contact angles. 
Matthew L. Blow and Julia M. Yeomans
cond-mat.soft