Print Email Facebook Twitter Numerical simulation of a forced and freely-vibrating cylinder at supercritical Reynolds numbers Title Numerical simulation of a forced and freely-vibrating cylinder at supercritical Reynolds numbers Author Derksen, Adriaan (TU Delft Aerospace Engineering) Contributor Viré, Axelle (mentor) Folkersma, Mikko (graduation committee) Sarwar, Kumayl (mentor) Degree granting institution Delft University of Technology Programme Aerospace Engineering | Aerodynamics and Wind Energy Date 2019-05-30 Abstract Recent innovations in the off-shore wind industry have lead to bigger wind turbines and taller support structures. These towers can suffer from vortex-induced vibrations (VIV). The present work couples the open-source CFD solver OpenFOAM with a structural solver to investigate these fluid-structure interactions (FSI) effects in more detail. 2D simulations are performed at supercritical Reynolds numbers and turbulence is modelled trough Unsteady Reynolds-Averaged Navier-Stokes (URANS). Two canonical VIV problems are considered: a transversely forced-vibrating and a transversely freely-vibrating (1 DOF) cylinder. Firstly, the aerodynamic damping was evaluated under different operating conditions by the forced-vibrating model. Furthermore, the effect of the structural mass, stiffness and damping parameters on the VIV response is analysed. Results will be summarised in terms of lock-in maps in the supercritical regime. Lastly, the reliability and accuracy of the CFD-FSI model has been assessed carefully. Eventually, these CFD results can be used to calibrate the phenomenological models for VIV at full-scale and are therefore a good compromise between engineering use and computational cost. Future work will investigate the effect of the spanwise flow component on the lock-in map, force magnification and wake patterns by means of large-eddy simulations. Subject Vortex-induced vibrationssupercritical Reynolds numberForced-vibrationFrree-vibrationnumerical simulationOpenFOAMURANSfluid-structure interactionCylinder aerodynamics To reference this document use: http://resolver.tudelft.nl/uuid:4c92eee4-8378-4a40-9180-bcb72f751076 Part of collection Student theses Document type master thesis Rights © 2019 Adriaan Derksen Files PDF FinalThesisReportAHPDerksen.pdf 9.15 MB Close viewer /islandora/object/uuid:4c92eee4-8378-4a40-9180-bcb72f751076/datastream/OBJ/view