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This study aims to investigate the possible sources of non-axisymmetricdisturbances and their propagation mechanism in Taylor Couette flow (TCF) forwide gap problems using direct numerical simulation with a radius ratio of 0.5and Reynolds number (Re) ranging from 60 to 650. Here, attention is focused onthe viscous layer (VL) thickness in near-wall regions and its spatialdistribution along the axial direction to gain an insight into the origin andpropagation of non-axisymmetric disturbances. The results show that anaxisymmetric Taylor-vortex flow occurs when Re is between 68 and 425. Above Re= 425, transition from axisymmetric to non-axisymmetric flow is observed up toRe = 575 before the emergence of wavy-vortex flow. From the variation of VLthickness with Re, the VL does not experience any significant changes in theflow separation region of the inner wall, as well as jet impingement region ofboth the inner and outer walls. However, a sudden increase in VL thickness inthe flow separation region of the outer wall reveals possible source ofnon-axisymmetric disturbances in the flow separation region of the outer wall.These disturbances develop into the periodic secondary flow as the axisymmetricflow transforms into non-axisymmetric flow and this leads to the emergence ofazimuthal wave. The periodic secondary flow contributes to sudden increase inthe natural wavelength and rapid reduction in the strength of twocounter-rotating Taylor vortices. This in turn leads to a substantial reductionof torque in the transition flow vis-a-vis axisymmetric Taylor-vortex flow.

Numerical study on wide gap Taylor Couette flow with flow transition