Simulation of low Reynolds number flow around a stationary cylinder in oscillating inflow
A low Reynolds number flow simulation around a cylinder for non-zero mean oscillatory inflow was carried out to study the differences in stress and flow field morphology of structures under different oscillation periods.Firstly,based on the self-developed underwater flow field simulation software zFlower,a module for inlet boundary conditions under un-steady inflow was developed.On the basis of a uniform and fully developed flow field,oscillation flow simulations with high and low frequency ratios were carried out to obtain the force state of the cylinder and the evolution process of the flow field under oscillation flow conditions.Results show that when the frequency of the incoming flow is high,the oscillating in-coming flow will affect the vortex shedding morphology of the flow,while the peak transverse force on the cylinder is rela-tively large.Meanwhile,when the incoming frequency is low,the absolute value of the lateral force acting on the structure does not change significantly,but the frequency spectrum of the force is complex,which may make it easier to excite the flow induced vibration of the structure.
oscillating flowflow structureunsteady flowlow Reynolds numberflow around a cylinder
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