Sedimentation of a flexible fiber in a weak vertical fluid flow

Lattice Boltzmann and lattice spring model is used to simulate the later al migration of a flexible fiber in a weak vertical fluid flow. Fiber aspect ratio, rigidity, sediment Reynolds number, and shear Reynolds number are varied. At a low Reynolds number, the fiber migrates to a lower fiber density area. In contrary, at a higher Reynolds number, the fiber migrates to a higher fiber density area. Effect of rigidity on lateral migration is studied.