Roll Motions
CFD for Roll Motions and Damping
In the design stage it is important to be able to predict the viscous roll damping of a vessel. However, computational methods based on potential flow theory cannot predict viscous effects. With CFD the damping coefficients can be obtained with reasonable accuracy. Furthermore, the complex flow behaviour around the bilges and bilge keels of the hull can be investigated.

Figure 1: Prediction of roll motion with CFD, see also [1]. Left: flow field around rolling object with sharp bilge. Right: predicted and measured roll damping coefficient.

Figure 2: Comparison of pressure contours [Pa] in the vicinity of the bilges for T=1.5s with amplitude 0.1 rad.

Figure 3: Comparison between calculated results and measured results for damping coefficient on hull with sharp and rounded bilge.

Figure 4: Comparison in flow vorticity field around bilge with sharp edge (left) and bilge with bilge keel (right) with equal amplitude and roll period.


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