In spite of many attempts to model dense granular flow, there is still no general theory capable of describing different types of flows, such as gravity-driven drainage in silos and wall-driven shear flows in Couette cells. Here, we summarize our recent proposal of the Stochastic Flow Rule (SFR), which is able to describe these cases in good agreement with experiments, and we focus on testing t...

A Hopf bifurcation with translational invariance has been widely considered as an appropriate model for the appearance of spiral vortices in counter-rotating Taylor-Couette flow. Our experimental work demonstrates that flow conditions close to the axial boundaries are responsible for the type of bifurcation scenario, i.e., either asymmetric pure traveling waves or more complex behavior, such as...

We explore the effect of forcing on linear shear flow or plane Couette flow, which is also background in very small region Keplerian accretion disk. show that depending strength and boundary conditions suitable for systems under consideration, and, hence, disk velocity profile modifies to parabolic Poiseuille Couette-Poiseuille frame reference. In presence rotation, becomes unstable at a smalle...