in industry, flow instabilities are important in journal bearings at high rotational speeds. for inviscid flows between two rotating coaxial cylinders, an instability criterion was introduced by taylor-couette. however, viscosity may play as stabilizer or destabilize in such flows. in this work, stability theories were reviewed for two coaxial rotating cylinders. then, flow instability patterns...

Abstract Steady plane turbulent free-surface flow over a slightly wavy bottom is considered for very large Reynolds numbers, small slopes, and Froude numbers close to the critical value 1. As in previous works, slope deviation from number are assumed be coupled such that turbulence modeling not required. The amplitudes of periodic elevations, however, half an order magnitude larger than case bu...