NUMERICAL SIMULATIONS FOR THE PHENOMENA OF VORTEX-INDUCED VIBRATION AND HEAT TRANSFER OF A CIRCULAR CYLINDER

Abstract

Fluid–structure interaction and heat transfer of a circular cylinder located in a spatially and temporally uniform, two-dimensional, laminar flow field was investigated. A pressure-based high-order upwind scheme using the PISO algorithm was applied to the simulation of vortex-induced vibration and heat transfer. The cylinder was allowed to move under the influence of a resultant force due to both pressure and shear drags. Combining cylinder movement with the Navier--Stokes equations, the behavior of natural coupling and heat transfer was hence simulated. The present study successfully simulated the motion of a cylinder and the associated vortex pattern as well as the “lock-in” phenomenon. In the flow field under natural coupling, the trajectory of the cylinder movement follows the shape of an “8”. Meanwhile, the motion pattern is sensitive to the variation of lift and drag coefficients. Heat transferred from a vibrating cylinder under natural coupling is enhanced as compared to the case of a fixed cylinder, especially when Reynolds number exceeds 400. If the vibration pattern can be precisely controlled, interference to the thermal boundary layer is expected to contribute to the enhancement of cylinder heat transfer.

This research work was supported by the National Science Council, Taiwan, ROC, under grant NSC91-2516-S-214-001.