IDEA:
L1-30 - Numerical and Analytical Simulations of Ship-Jacket Collisions

PILLAR:
C - Waterborne

RESEARCH AREA:
RA5 - Safe, Secure and Resilient Transport Systems

TEAM NAME:
OWTColl

TEAM MEMBERS:
Martinus Putra Widjaja (Team leader)


UNIVERSITY:
ICAM

COUNTRY:
FRANCE

ABSTRACT:
Nowadays, the challenge on
offshore industry increasing as the European Union target to generate 20-40 GW
by 2020 from the renewable energy sector. Thus, a bigger wind farm is needed
and it leads to a different structure to sustain the load on the offshore site.
Jacket type structures are one solution that could be used in deeper sea and it
is important to perform a study on this particular jacket’s type. Based on that
fact, collision frequency in the North Sea and the possible widespread risks of
the ship-jacket collision, the industry needs another tool to analyze the
collisions rather than the commercial finite element solver which takes a lot
of time to complete the calculation. 
The super-element method based on plastic
limit analysis has been applied in a previous work to derive analytically the
crushing resistance of a cylinder when it is impacted by the stem or the bulb
of a striking ship. Then, the developed algorithms have been implemented (also
in a previous work) in an analytical tool named “COLEOL”. The aim of this
master thesis is to perform nonlinear numerical simulations of rigid ship - jacket
collisions using the well-known finite element code LS-DYNA and to compare the
obtained results (crushing force as shown on figure below) and absorbed energy
to COLEOL results. For several impact scenarios, the discrepancy between
numerical and analytical calculations is assessed and the limitations of the
COLEOL program are outlined
