Shanghai Rules and Research Institute

Shanghai, China

Shanghai Rules and Research Institute

Shanghai, China

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Zhang C.,South China University of Technology | Zhang C.,Shanghai Rules and Research Institute | Zhang W.,South China University of Technology | Lin N.,South China University of Technology | And 6 more authors.
Ocean Engineering | Year: 2013

A numerical model is developed to solve increasing ocean engineering problems involving complex and/or moving rigid structures and nonlinear free surface action with considering air movement effects. The model is based on the two-phase flow model of incompressible viscous immiscible fluids containing various interfaces, and employs a coupled immersed boundary (IB) and volume of fluid (VOF) methods. To solve the governing equations, a two-step projection method is employed and the finite difference method on a staggered and fixed Cartesian grid is used throughout the computation. The bi-conjugate gradient stabilized technique is applied to solve the pressure Poisson equation. In particular, the advection term is discretized in a composite difference scheme to enhance the stability of the algorithm. The direct forcing IB method is utilized to deal with no-slip boundary condition, while the VOF method, which employs a piecewise line interface calculation technique and a Lagrange method to reconstruct and update the interface respectively, is used to track distorted and broken free surfaces. The results of this study demonstrate the accuracy and capability of the two-phase model to simulate a moving body in free surface flows while also considering air movement effects. © 2013 Elsevier Ltd.


Zhang W.,South China University of Technology | Tang Y.,South China University of Technology | Zhao C.,South China University of Technology | Zhang C.,South China University of Technology | Zhang C.,Shanghai Rules and Research Institute
Applied Mechanics and Materials | Year: 2012

A numerical model based on the two-phase flow model for incompressible viscous fluid with a complex free surface has been developed in this study. The two-step projection method is employed to solve the Navier-Stokes equations in the numerical solutions, and finite difference method on a staggered grid is used throughout the computation. The two-order accurate volume of fluid (VOF) method is used to track the distorted and broken free surfaces. The two-phase model is first validated by simulating the dam break over a dry bed, in which the numerical results and experimental data agree well. Then 2-D fluid sloshing in a horizontally excited rectangular tank at different excitation frequencies is simulated using this two-phase model. The results of this study show that the two-phase flow model with VOF method is a potential tool for the simulation of nonlinear fluid sloshing. These studies demonstrate the capability of the two-phase model to simulate free surface flow problems with considering air movement effects. © (2012) Trans Tech Publications, Switzerland.


Zhang C.,Shanghai Rules and Research Institute | Zhang C.,South China University of Technology | Lin N.,South China University of Technology | Tang Y.,Center for Maritime Engineering | Zhao C.,South China University of Technology
Computers and Fluids | Year: 2014

In this study, a finite difference model for the viscous incompressible Navier-Stokes (N-S) equations is developed to investigate problems with respect to wave-structure interaction. A two-step projection algorithm is employed to discretize the N-S equations on a fixed Cartesian grid. Coupled with wave generating and absorbing options, the model captures free surfaces using a volume-of-fluid method with a second-order piecewise linear interface construction (PLIC-VOF). In addition, a second-order sharp interface immersed boundary (SI-IB) method is utilized to account for the no-slip boundary condition on structure surfaces. The new model is capable of simulating free surface flows and their interaction with a stationary or moving structure, and wave generating and absorbing options are available in the model for some specific cases. To validate the model from different aspects, a series of numerical experiments are conducted. These tests include an oscillating cylinder in fluid without a free surface, liquid sloshing in a tank, water exit and entry of a horizontal cylinder, some wave generation and absorption tests, and a solitary wave over a submerged rectangular obstacle. Excellent agreement is obtained when the results are compared to analytical, experimental and other numerical results. Furthermore, two cases of a submerged and a semi-submerged ellipse rotating in a tank are investigated, and some significant phenomena are observed. © 2013 Elsevier Ltd.


Zhou Y.,Shanghai JiaoTong University | Zhou Y.,Shanghai Rules and Research Institute | Ma N.,Shanghai JiaoTong University | Gu J.,Shanghai JiaoTong University
Ship Building of China | Year: 2013

Parametric rolling in head seas as one of the main stability failure models has attracted significant attentions of the International Maritime Organization (IMO). Roll moment of inertia is one of the key factors for predicting parametric rolling, since it has strong effect on natural roll period. In this paper, total of four calculation methods of roll moment of inertia are compared with each other and a 3 DOF weakly non-linear model is presented to study their effects on the prediction of parametric rolling. Radiation force and diffraction force are calculated based on 3D frequency-domain method, and time-delay effect is taken into account with the help of impulse response theory. The effect of different calculation methods of roll moment of inertia on the response of motion is discussed based on the vulnerability analysis of 3 actual container ships, and a simplified empirical approach of roll moment of inertia is given, which could be applied to the second generation intact stability criteria for parametric rolling prediction.


Zhou Y.-H.,Shanghai JiaoTong University | Zhou Y.-H.,Shanghai Rules and Research Institute | Ma N.,Shanghai JiaoTong University | Shi X.,Shanghai Rules and Research Institute | Zhang C.,Shanghai Rules and Research Institute
Journal of Hydrodynamics | Year: 2015

The effect of roll damping on the prediction of a ship's motion is significant. A method based on the 3-D CFD approach for calculating the roll damping of a ship is proposed in this paper. The free decay experiments of 4 different types of ships at zero velocity are carried out. The roll damping coefficients are calculated and compared with the experiment results, with a good agreement. It is shown that the method adopted in this paper could be used to simulate the free rolling of a ship in the calm water at zero velocity very well and with good, stable accuracy for the prediction of the roll damping, and also with good applicability. This method may be further developed for the prediction of a full scale ship in the future. © 2015 Publishing House for Journal of Hydrodynamics.


Zhang D.,Shanghai JiaoTong University | Zhang D.,Marine Design and Research Institute of China | Huang X.-P.,Shanghai JiaoTong University | Ding S.-F.,Shanghai Rules and Research Institute | And 2 more authors.
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2014

The fatigue loading is obtained based on the classification society rules and Weibull long-term checking stress range distribution. Equivalent stress method is used to transform random loading spectrum into constant loading spectrum. A procedure which consists of FAD technology and crack growth life prediction method is used to assess the security life of high tensile thick steel plates under complex loading conditions. Fatigue life of a surface crack and an embedded crack located at butt welded joint in the upper deck of a large container ship under complex loading conditions, considering the effect of welded residual stress, are assessed respectively. It is concluded that the initial size of crack has significant effect on crack growth behavior, and the harmfulness of surface crack on structural security is more serious than that of embedded crack in conditions of the same initial crack size and applied load.


Ding S.-F.,Shanghai JiaoTong University | Ding S.-F.,Shanghai Rules and Research Institute | Tang W.-Y.,Shanghai JiaoTong University | Zhang S.-K.,Shanghai JiaoTong University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2010

In considering that the change of material performance in relation to temperature has an important impact on the research of the structural safety of an LNG carrier, it was concluded that the elastic modules, poisson ratio, and thermal expansion coefficient of the materials appear to have a nonlinear change in relation to temperature. MARC was taken as a calculation tool, a typical hollow cavity model of an LNG carrier was selected, and contrast analysis for a partial temperature field and temperature stress was conducted. These steps were taken to investigate the sensitivity of the partial strength of an LNG carrier against nonlinearity of material. The result shows that a difference exists for whether or not nonlinearity of material is considered-in the former case, the thermal stress value is small, and in general, it is a conservative way not to consider the nonlinear factor of material.


ZHOU Y.-H.,Shanghai JiaoTong University | ZHOU Y.-H.,Shanghai Rules and Research Institute | MA N.,Shanghai JiaoTong University | LU J.,China Ship Scientific Research Center | GU M.,China Ship Scientific Research Center
Journal of Hydrodynamics | Year: 2016

The parametric rolling (PR) in the head or following waves has been considered as one of the main stability failure modes in the development of the 2nd generation Intact Stability criterion by the International Maritime Organization (IMO). According to previous studies, the estimation methods of the roll damping affect the prediction of the PR significantly, and most of them are based on experiment data or Ikeda's empirical formula. The accuracy of the estimation method for the roll damping could be a key aspect for the validity of its prediction for the full scale ship. In this research, a hybrid prediction method is developed for the numerical prediction of the parametric rolling when experiment data are not available for the roll damping. Comparison study is also carried out between the hybrid method and a nonlinear dynamics method, where the roll damping is estimated by the simplified Ikeda's method and the direct CFD prediction method in a direct non-linear simulation based on the 3-D CFD approach in the model scale. It is shown that the results of the hybrid method are in satisfactory agreements with the model experiment results, and the method can be used for analysis especially at the early design stage where experiment data are often not available. © 2016 Publishing House for Journal of Hydrodynamics


Chen G.-Q.,Hefei University of Technology | Zhuang L.,Hefei University of Technology | Zhuang L.,Shanghai Rules and Research Institute | Zhou J.-B.,Hefei University of Technology | And 2 more authors.
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2011

Oscillation form, spreading velocity, oscillation frequency and amplitude of aviation fuel flame spreading were analyzed. When fuel temperature increased within the critical value, the spreading velocity and oscillation frequency of main flame and the oscillation amplitude of flash flame increased. Semi-empirical models were also developed to predict flame spreading velocity and oscillation frequency under different fuel temperature.

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