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32 SAMC
o
T • Annual report 2012
Fig. 28. A 1D numerical model has been developed to simu-
late a dynamic ice-structure interaction. Left: A graphi-
cal representation of the model, where a lattice grid of ice
nodes interacts with a cylindrical structure. The red areas
represent failed ice zones. Right: A typical result obtained
for the ice load in the intermittent crushing regime. The
characteristic saw-tooth pattern is clearly observed.
Fig. 29. Illustration of the analogies among different fields.
Left: A typical vortex shedding pattern when a flow moves
around a cylindrical structure. The oscillating forces inter-
act with the structure, causing it to start oscillating. Right:
An ice floe moving around an offshore structure known
to give rise to interaction and oscillation of the structure.
Could there be some similarity between the two? And what
can we learn from the experience in the field of VIV?
Numerical Modelling of Ice-Induced
Vibrations
After careful analysis of the model data, SAMCoT WP3
was chosen to develop a new numerical model for the
prediction of dynamic ice-structure interaction.
The aim of the project, initiated in 2012, was to incorpo
rate several phenomena in a 2D lattice model (Fig. 27).
The ice near the structure is divided in several nodes,
which take into account the natural inhomogeneous
character of ice. These nodes incorporate the driving
forces, confinement and friction at the ice-structure
interface and the interaction zone to predictively
model these regimes of an ice-structure interaction.
These good expectations are based on a 1D develop
ment and confirmed that the chosen approach can
lead to a model capable of predicting all three regimes
(Fig. 28).