Naslov
Wind load computations of a offshore floating object

Autori
Jovan, Ivica

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
24.01

Godina
2018

Stranica
82

Mentor
Jasak, Hrvoje

Ključne riječi
CFD ; foam-extend ; influence of wind ; Paired-Column Semi submersible platform

Sažetak
Very high and complex structures need to be able to withstand the external loads imposed by nature, at least to the extent that the disastrous damage of natural forces is reduced to acceptable limits. One of such structures are oil platforms that are exposed to the influence of strong winds due to their location on the open sea. Accurate assessment and prediction of wind loads are very important for reducing adverse effects. The current methods used for studying wind effects around objects are measurements on existing objects and measurements in wind tunnels. However they are complex and expensive. Due to the rapid development of computer technology, the unavoidable segment of complex fluid flow analysis is Computational Fluid Dynamics (CFD) which is becoming an alternative method. In this thesis, the open source CFD package foam-extend is used to simulate incompressible flow around two different Paired-Column Semi submersible platform models (Test D and Test J). The 3D CAD models were obtained from SNAME OC-8 Comparative Wind Load Study. Numerical simulations are performed for four different cases. Each of the models are simulated with two different approaches of turbulence modelling, RANS and LES. The results of numerical simulations are presented as images of the flow field for different variables. A comparison of the atmospheric boundary layer obtained from simulations and in the wind tunnel is shown. The values of force coefficient and moment coefficients are also compared with the values obtained in the wind tunnel.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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