Rational assessment of stern slamming of a large twin screw liquefied natural gas (LNG) carrier comprised prediction of hydrodynamic impact loads and their effects on the dynamic global structural behavior of the hull girder. Linear theory obtained regular equivalent waves that caused maximum relative normal velocities at critical locations underneath the ship’s stern. Reynolds-averaged Navier–Stokes computations based on the volume of fluid method yielded transient (nonlinear) hydrodynamic impact (slamming) loads that were coupled to a nonlinear motion analysis of the ship in waves. At every time step of the transient computation, the finite volume grid was translated and rotated, simulating the actual position of the ship. Hydrodynamic loads acting on the hull were converted to nodal forces for a finite element model of the ship structure. Slamming-induced pressure peaks, typically lasting for about 0.5 s, were characterized by a steep increase and decrease before and after the peak values. Shape and duration agreed favorably with full-scale measurements and model tests carried out on other ships, indicating the plausibility of our numerical predictions. Hull girder whipping was analyzed to investigate dynamic amplification of structural stresses. Short-duration impact-related slamming loads excited the ship structure to vibrations in a wide range of frequencies. Excitation of the lowest fundamental eigenmode contributed most to additional stresses caused by hull girder whipping. Although, for the cases investigated, longitudinal stresses and shear stresses caused by quasisteady wave bending were uncritical, we obtained a significant amplification (up to 25%) due to the dynamic structural response.
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August 2009
Ocean Engineering
Stern Slamming of a LNG Carrier
Daewoong Kim
e-mail: daewoong@dsme.co.kr
Daewoong Kim
Daewoo Shipbuilding & Marine Engineering Co. Ltd.
, 541 Daewoo Center Building Namdaemunro 5-Ga, Jung-Gu 656-714, South Korea
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Jan Oberhagemann
Michael Holtmann
Ould el Moctar
Thomas E. Schellin
Daewoong Kim
Daewoo Shipbuilding & Marine Engineering Co. Ltd.
, 541 Daewoo Center Building Namdaemunro 5-Ga, Jung-Gu 656-714, South Koreae-mail: daewoong@dsme.co.kr
J. Offshore Mech. Arct. Eng. Aug 2009, 131(3): 031103 (10 pages)
Published Online: June 2, 2009
Article history
Received:
July 3, 2008
Revised:
October 5, 2008
Published:
June 2, 2009
Citation
Oberhagemann, J., Holtmann, M., el Moctar, O., Schellin, T. E., and Kim, D. (June 2, 2009). "Stern Slamming of a LNG Carrier." ASME. J. Offshore Mech. Arct. Eng. August 2009; 131(3): 031103. https://doi.org/10.1115/1.3124131
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