| Author | de Wilde, J.J., Huijsmans, R.H.M (MARIN) and Triantafyllou, M.S. (MIT) |
| Title | Experimental Investigation of the Sensitivity to In-line Motions and Magnus-like Lift Production on the Vortex-Induced Vibrations |
| Conference/Journal | ISOPE Conference, Honolulu, Hawaii |
| Paper no. | ISOPE2003-JSC-270 |
| Month | May |
| Year | 2003 |
Abstract
Experiments were carried out with a transversely oscillating cylinder in steady current, to investigate the sensitivity to small cylinder pitch rotations and in-line motions on the vortex induced lift forces. The in-line motions of a spring blade mounted cylinder are convex when towing forward (pushing) and concave when towing backwards (pulling). At the same time the cylinder performs a small pitch rotation (about its central axis), which could induce Magnus-like lift forces. An unexpectedly large sensitivity was found to the in-line motions in certain tests with oscillation amplitudes of over half a diameter. The observed sensitivity to the cylinder pitch rotations was rather small. The tests were carried out in the lock-in regime for VIV and at sub-critical Reynolds numbers, which are close to the critical Reynolds regime. The results presented in this paper will initiate further investigation and will potentially have practical implications as well.
Experiments were carried out with a transversely oscillating cylinder in steady current, to investigate the sensitivity to small cylinder pitch rotations and in-line motions on the vortex induced lift forces. The in-line motions of a spring blade mounted cylinder are convex when towing forward (pushing) and concave when towing backwards (pulling). At the same time the cylinder performs a small pitch rotation (about its central axis), which could induce Magnus-like lift forces. An unexpectedly large sensitivity was found to the in-line motions in certain tests with oscillation amplitudes of over half a diameter. The observed sensitivity to the cylinder pitch rotations was rather small. The tests were carried out in the lock-in regime for VIV and at sub-critical Reynolds numbers, which are close to the critical Reynolds regime. The results presented in this paper will initiate further investigation and will potentially have practical implications as well.