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Zou C.-F.,Shanghai JiaoTong University | Zou C.-F.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | Wang D.-Y.,Shanghai JiaoTong University | Wang D.-Y.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | And 4 more authors.
Journal of Marine Science and Technology (Japan) | Year: 2015

A series of sloshing model tests for various viscous liquids were carried out and the effects of liquid viscosity on sloshing are investigated quantitatively in this paper. The experimental results show that the liquid viscosity has an important effect on sloshing pressure, which is the mean value of those peak pressures from several consecutive periods. Energy dissipation due to viscous friction leads to reduction of sloshing pressure and the dissipation effect is more remarkable, especially when liquid viscosity becomes higher. As a result of viscous damping effect, the rising time of impact pressure is longer in higher viscosity liquid. © 2015, JASNAOE.


Ao L.,Shanghai JiaoTong University | Ao L.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | Wang D.-Y.,Shanghai JiaoTong University | Wang D.-Y.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration
International Journal of Naval Architecture and Ocean Engineering | Year: 2016

The present paper studies the ultimate torsional strength of stiffened box girders with large deck opening due to the influence of cracks. Three types of hull girders with different spans are provided for comparison. Potential parameters which may have effects on the torsional strength including the mesh refinement, initial deflection, material strain hardening, geometric properties of crack and stiffener are discussed. Two new concepts that play an significant role in the ultimate strength research of damaged box girders are introduced, one of which is the effective residual section (ERS), the other is the initial damage of the failure zone (IDFZ) for intact structures. New simple formulas for predicting the residual ultimate torsional strength of cracked stiffened box girders are derived on the basis of the two new concepts. © 2016 Production and hosting by Elsevier B.V. on behalf of Society of Naval Architects of Korea.


Zou C.-F.,Shanghai JiaoTong University | Zou C.-F.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | Wang D.-Y.,Shanghai JiaoTong University | Wang D.-Y.,The Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration | And 2 more authors.
International Journal of Naval Architecture and Ocean Engineering | Year: 2015

In this paper, numerical investigations for tank sloshing, based on commercial CFD package FLUENT, are performed to study effects of boundary layer grid, liquid viscosity and compressible air on sloshing pressure, wave height and rising time of impact pressure. Also, sloshing experiments for liquids of different viscosity are carried out to validate the numerical results. Through comparison of numerical and experimental results, a computational model including boundary layer grid can predict the sloshing pressure more accurately. Energy dissipation due to viscous friction leads to reduction of sloshing pressure and wave elevation. Sloshing pressure is also reduced because of cushion effect of compressible air. Due to high viscosity damping effect and compressible air effect, the rising time of impact pressure becomes longer. It is also found that liquid viscosity and compressible air influence distribution of dynamic pressure along the vertical tank wall. © SNAK, 2015.

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