The oscillating vortices are of much practical importance in the analysis of the fluid-induced
vibrations in cross-flow of a steam generator. However, the investigations on the vortex
shedding, unsteady lifts, frequency spectrums, and the required number of tubes to study the
phenomenon are very limited. In this work, a series of numerical experiments of a triangular
array of tubes with a pitch ratio of 1.633 have been performed. The lift coefficients of the
tubes were monitored to examine the effects of the numbers of tube rows and columns on …