numerical prediction of fluid-elastic instability in tube bundles under cross flows

prediction of fluid-elastic instability is a great matter of importance in designing cross-flow tube bundles from the perspective of vibration. in the present paper, the threshold of fluid-elastic instability has been numerically predicted via simulation of incompressible, unsteady, and turbulent cross-flow through a tube bundle in a normal triangular arrangement. the conditions of simulation is the same as a previous experiment. a finite volume solver, based on cartesian-staggered grid, has been implemented and the interactions between fluid and structure are solved fully coupled method of solving flow and structure equations in each time step. the fluid-elastic instability was predicted and analyzed by presenting the structural responses, trajectory of flexible cylinders, and critical reduced velocities.