Effect of roof impacts on coupling between wave response and sloshing in tanks of LNG-carriers B. Molin, F. Remy (Ecole Centrale Marseille) A. Ledoux, N. Ruiz (Principia)
Jan 09, 2016
Effect of roof impacts on coupling between wave response and sloshing
in tanks of LNG-carriers
B. Molin, F. Remy (Ecole Centrale Marseille)
A. Ledoux, N. Ruiz (Principia)
Experimental and numerical roll RAOsIrregular sea-state Tp=1.6s, Hs=0.034m.
Tanks 1 and 2: 19cm Tank 1: 39cm. Tank 2: 19cm.
ROOF AT FREE SURFACE. ADJUSTMENT OF ROLL VISCOUS COEFFICIENT
HS = 6 cm
ROLL RAO
ROOF AT FREE SURFACE. ADJUSTMENT OF ROLL VISCOUS COEFFICIENT
HS = 12 cm
ROLL RAO
FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS)
ROLL RAO
FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS)
RAO OF THE FIRST SLOSHING MODE
FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS)
RAO OF THE THIRD SLOSHING MODE
FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 12 cm, TP = 1.6 s (A FEW IMPACTS)
ROLL RAO
FLAT ROOF 16 cm ABOVE FREE SURFACE. EXPERIMENTAL RAOS OF THE FIRST
SLOSHING MODE HS = 6, 9, 12 cm TP = 1.6 s
EXPERIMENTAL ROLL RAOSFLAT ROOF AT 16, 11, 5 cm.
HS = 12 cm TP = 1.6 s
HS = 6 cm
CHAMFERED ROOFS
MESH FOR DIOCUVE
EXPERIMENTAL ROLL RAOSFLAT VS. CHAMFERED 16 cm ABOVE F.S.
HS = 6 cm TP = 1.6 s
EXPERIMENTAL AND NUMERICAL ROLL RAOSFLAT VS. CHAMFERED 16 cm ABOVE F. S.
HS = 6 cm TP = 1.6 s
FLAT
EXPERIMENTAL AND NUMERICAL ROLL RAOSCHAMFERED ROOF 16 cm ABOVE F. S.
HS = 12 cm TP = 1.6 s
EXPERIMENTAL AND NUMERICAL ROLL RAOSCHAMFERED ROOF 11 cm ABOVE F. S.
HS = 6 cm TP = 1.6 s
EXPERIMENTAL AND NUMERICAL ROLL RAOSCHAMFERED ROOF 11 cm ABOVE F. S.
HS = 12 cm TP = 1.6 s
Conclusions
• Roof impacts do not seem to affect the roll response much
• Free surface non-linearities play a major role
• Chamfers effective by reducing free surface length
• Exploitation of test data still incomplete (roof impact loads)
FLAT ROOF 11 cm ABOVE FREE SURFACE