Structure formation of rod-like fillers in a contraction flow

Rod-like fillers in a flow field of viscous fluid may form complex structures after passing sudden contraction. The rods start with dilute distribution random positions and orientations. Behind the contraction, large amount tumble spatially correlated way, such that orientations perpendicular to occur at regular distances along channel. tumbling results from an interplay several effects, inferred by space dependent shear flow, accumulation certain distance wall, rod alignment system is studied numerically for rod-like shear-thinning fluid.