Aiming at frequently occurred vibration damage problems of conventional heat exchangers,based on dynamic mesh technique and two-way fluid-structure interaction,a three-dimension numerical model of flow-induced vibration was established.The vibration trajectory of tube bundles, which were obtained difficultly in the experiment, were supplemented by numerical simulation.The change of the main vibration direction in the fluid-elastic instability of the tube bundle was studied.The influence of tube position on ...