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Effect of roof impacts on coupling between wave response and sloshing in tanks of LNG-carriers

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 RAOs Irregular sea-state Tp=1.6s, Hs=0.034m. Tanks 1 and 2: 19cm.

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Effect of roof impacts on coupling between wave response and sloshing in tanks of LNG-carriers

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  1. 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)

  2. Experimental and numerical roll RAOs Irregular sea-state Tp=1.6s, Hs=0.034m. Tanks 1 and 2: 19cm Tank 1: 39cm. Tank 2: 19cm.

  3. ROOF AT FREE SURFACE. ADJUSTMENT OF ROLL VISCOUS COEFFICIENT ROLL RAO HS = 6 cm

  4. ROOF AT FREE SURFACE. ADJUSTMENT OF ROLL VISCOUS COEFFICIENT ROLL RAO HS = 12 cm

  5. FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS) ROLL RAO

  6. FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS) RAO OF THE FIRST SLOSHING MODE

  7. FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 6 cm, TP = 1.6 s (NO IMPACTS) RAO OF THE THIRD SLOSHING MODE

  8. FLAT ROOF 16 cm ABOVE FREE SURFACE. HS = 12 cm, TP = 1.6 s (A FEW IMPACTS) ROLL RAO

  9. FLAT ROOF 16 cm ABOVE FREE SURFACE. EXPERIMENTAL RAOS OF THE FIRST SLOSHING MODE HS = 6, 9, 12 cm TP = 1.6 s

  10. EXPERIMENTAL ROLL RAOS FLAT ROOF AT 16, 11, 5 cm. HS = 12 cm TP = 1.6 s HS = 6 cm

  11. CHAMFERED ROOFS

  12. MESH FOR DIOCUVE

  13. EXPERIMENTAL ROLL RAOS FLAT VS. CHAMFERED 16 cm ABOVE F.S. HS = 6 cm TP = 1.6 s

  14. EXPERIMENTAL AND NUMERICAL ROLL RAOS FLAT VS. CHAMFERED 16 cm ABOVE F. S. HS = 6 cm TP = 1.6 s FLAT

  15. EXPERIMENTAL AND NUMERICAL ROLL RAOS CHAMFERED ROOF 16 cm ABOVE F. S. HS = 12 cm TP = 1.6 s

  16. EXPERIMENTAL AND NUMERICAL ROLL RAOS CHAMFERED ROOF 11 cm ABOVE F. S. HS = 6 cm TP = 1.6 s

  17. EXPERIMENTAL AND NUMERICAL ROLL RAOS CHAMFERED ROOF 11 cm ABOVE F. S. HS = 12 cm TP = 1.6 s

  18. 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)

  19. FLAT ROOF 11 cm ABOVE FREE SURFACE

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