Nonlinear vertical accelerations of a floating torus in regular waves
Journal article, Peer reviewed
Accepted version
Permanent lenke
http://hdl.handle.net/11250/2469507Utgivelsesdato
2016Metadata
Vis full innførselSamlinger
- Institutt for marin teknikk [3469]
- Publikasjoner fra CRIStin - NTNU [38525]
Originalversjon
Journal of Fluids and Structures. 2016, 66 589-608. 10.1016/j.jfluidstructs.2016.08.007Sammendrag
The longitudinal motions and vertical accelerations of a floating torus as well as wave motion inside the torus are studied by model tests in regular deep-water waves. Comparisons are made with linear and partly with second-order potential-flow theory for the smallest examined experimental wave height-to-wave length ratio 1/120. Reasonable agreement is obtained, in particular for the linear problem. The importance of 3D flow, hydroelasticity and strong hydrodynamic frequency dependency is documented. Experimental precision errors and bias errors, for instance, due to tank-wall interference are discussed. Numerical errors due to viscous effects are found to be secondary. Experiments show that the third and fourth harmonic accelerations of the torus matter and cannot be explained by a perturbation method with the wave steepness as a small parameter.