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-flowtube 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.