The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform

Yun Peng Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Numerical simulation of dynamic response of a net cage for flatfish in waves
    China Ocean Engineering, 2014
    Co-Authors: Yun Peng Zhao, Tiao-jian Xu, Changtao Guan
    Abstract:

    A numerical model of flatfish cage is built based on the lumped mass method and the principle of rigid body kinematics. To validate the numerical model, a series of physical model tests are conducted in the wave flume. The numerical results correspond well with the data sets from physical model test. The effect of weight of bottom frame, height of fish net and net shape on motion responses of fish cage and tension force on mooring lines is then analyzed. The results indicate that the vertical displacements of Float Collar and bottom frame decrease with the increase in the weight of bottom frame; the maximum tension force on mooring lines increases with the increasing weight of bottom frame. The inclination angles of Float Collar and bottom frame decrease with the increasing net height; the maximum tension force increases obviously with the increase of net height.

  • Numerical analysis of hydrodynamic behaviors of two net cages with grid mooring system under wave action
    China Ocean Engineering, 2012
    Co-Authors: Chang-ping Chen, Guohai Dong, Yun Peng Zhao, Yucheng Li, Yan-na Zheng
    Abstract:

    Based on rigid kinematics theory and lumped mass method, a mathematical model of the two net cages of grid mooring system under waves is developed. In order to verify the numerical model, a series of physical model tests have been carried out. According to the comparisons between the simulated and the experimental results, it can be found that the simulated and the experimental results agree well in each wave condition. Then, the forces on the mooring lines and the Floating Collar movement are calculated under different wave conditions. Numerical results show that under the same condition, the forces on the bridle ropes are the largest, followed by forces on the main ropes and the grid ropes. The horizontal and the vertical Float Collar motion amplitudes increase with the increase of wave height, while the relationship of the horizontal motion amplitude and the wave period is indistinct. The vertical motion amplitude of the two cages is almost the same, while on the respect of horizontal motion amplitude, cage B (behind cage A, as shown in Fig. 4) moves much farther than cage A under the same wave condition. The inclination angle of the Floating system both in clockwise along y axis and the counter one enlarges a little with the increase of wave height.

  • Motion Characteristics of Composite-Type Sea Cage under Pure Wave
    Advanced Materials Research, 2012
    Co-Authors: Chun Liu Li, Yun Peng Zhao
    Abstract:

    To study motion range changes with wave condition and motion relationship between cages, physical model experiments were carried out. The authors designed 2 models of composite-type sea cages. Experimental data obtained by the CCD data acquisition system. The experiment results showed that 1.in the same period, horizontal motion range,vertical motion range and inclination changes of Float Collar increase with wave height; 2.In the same wave height, horizontal motion range of the Float Collar increases with period; 3.The laws between vertical motion and period are not obvious 4.The laws between inclination changes and period are not obvious 5.Motion range of the first cage along the direction of waves is less than other cages.

  • Analysis of hydrodynamic behaviors of gravity net cage in irregular waves
    Ocean Engineering, 2011
    Co-Authors: Tiao-jian Xu, Guohai Dong, Yun Peng Zhao, Yucheng Li
    Abstract:

    Abstract Based on the lumped-mass method and rigid-body kinematics theory, a mathematical model of a gravity cage system attacked by irregular waves is developed to simulate the hydrodynamic response of cage system, including the maximum tension of mooring lines and the motion of Float Collar. The normalized response amplitudes (response amplitude operators) are calculated for the cage motion response in heave and surge, and the mooring line tension response, in regular waves. In addition, a statistical approach is taken to determine the motion and tension transfer functions in irregular waves. In order to validate the numerical model of a gravity cage attacked by irregular waves, numerical predictions have been compared with the experimental observations in the time and frequency domain. The effect of wave incident angle on the Float Collar motion, mooring line tension and net volume reduction of the gravity cage system in irregular waves is also investigated. The results show that at high frequencies, the cage system has no significant heave motion. It tends to contour itself to longer waves. The variation amplitude of mooring line forces decreases as the wave frequency increases. With the increasing of wave incident angle, the horizontal displacement of the Float Collar increases.

Guohai Dong - One of the best experts on this subject based on the ideXlab platform.

  • Numerical analysis of hydrodynamic behaviors of two net cages with grid mooring system under wave action
    China Ocean Engineering, 2012
    Co-Authors: Chang-ping Chen, Guohai Dong, Yun Peng Zhao, Yucheng Li, Yan-na Zheng
    Abstract:

    Based on rigid kinematics theory and lumped mass method, a mathematical model of the two net cages of grid mooring system under waves is developed. In order to verify the numerical model, a series of physical model tests have been carried out. According to the comparisons between the simulated and the experimental results, it can be found that the simulated and the experimental results agree well in each wave condition. Then, the forces on the mooring lines and the Floating Collar movement are calculated under different wave conditions. Numerical results show that under the same condition, the forces on the bridle ropes are the largest, followed by forces on the main ropes and the grid ropes. The horizontal and the vertical Float Collar motion amplitudes increase with the increase of wave height, while the relationship of the horizontal motion amplitude and the wave period is indistinct. The vertical motion amplitude of the two cages is almost the same, while on the respect of horizontal motion amplitude, cage B (behind cage A, as shown in Fig. 4) moves much farther than cage A under the same wave condition. The inclination angle of the Floating system both in clockwise along y axis and the counter one enlarges a little with the increase of wave height.

  • Analysis of hydrodynamic behaviors of gravity net cage in irregular waves
    Ocean Engineering, 2011
    Co-Authors: Tiao-jian Xu, Guohai Dong, Yun Peng Zhao, Yucheng Li
    Abstract:

    Abstract Based on the lumped-mass method and rigid-body kinematics theory, a mathematical model of a gravity cage system attacked by irregular waves is developed to simulate the hydrodynamic response of cage system, including the maximum tension of mooring lines and the motion of Float Collar. The normalized response amplitudes (response amplitude operators) are calculated for the cage motion response in heave and surge, and the mooring line tension response, in regular waves. In addition, a statistical approach is taken to determine the motion and tension transfer functions in irregular waves. In order to validate the numerical model of a gravity cage attacked by irregular waves, numerical predictions have been compared with the experimental observations in the time and frequency domain. The effect of wave incident angle on the Float Collar motion, mooring line tension and net volume reduction of the gravity cage system in irregular waves is also investigated. The results show that at high frequencies, the cage system has no significant heave motion. It tends to contour itself to longer waves. The variation amplitude of mooring line forces decreases as the wave frequency increases. With the increasing of wave incident angle, the horizontal displacement of the Float Collar increases.

  • research on the Float Collar of a gravity fish cage
    Engineering Applications of Computational Fluid Mechanics, 2009
    Co-Authors: Guohai Dong, Y N Zheng, B Teng, Y C Li
    Abstract:

    AbstractThe development of the fish cage has become more and more important for human beings, and a lot of achievements have been obtained in the field of aquacultural engineering. However, due to the environmental protection and the coastal utilization problems, moving marine aquaculture from near-shore region into deep sea has become imperative. Generally speaking, the advantages of developing the deep-sea aquaculture outweigh its disadvantages. However, some issues have become very critical, such as the higher waves and/or stronger current forces on the whole system of the fish cage. Thus a systematic and thorough research into the fish cage system in deep water is a task of top priority. By selecting a typical gravity fish cage with the fold-line or straight-line mooring system, this paper focuses on the research on the movement of the generalized Float Collar and the tension of the mooring ropes. The comparison between the experimental and computational results shows that the current computational me...

Zhu Hemin - One of the best experts on this subject based on the ideXlab platform.

Y C Li - One of the best experts on this subject based on the ideXlab platform.

  • research on the Float Collar of a gravity fish cage
    Engineering Applications of Computational Fluid Mechanics, 2009
    Co-Authors: Guohai Dong, Y N Zheng, B Teng, Y C Li
    Abstract:

    AbstractThe development of the fish cage has become more and more important for human beings, and a lot of achievements have been obtained in the field of aquacultural engineering. However, due to the environmental protection and the coastal utilization problems, moving marine aquaculture from near-shore region into deep sea has become imperative. Generally speaking, the advantages of developing the deep-sea aquaculture outweigh its disadvantages. However, some issues have become very critical, such as the higher waves and/or stronger current forces on the whole system of the fish cage. Thus a systematic and thorough research into the fish cage system in deep water is a task of top priority. By selecting a typical gravity fish cage with the fold-line or straight-line mooring system, this paper focuses on the research on the movement of the generalized Float Collar and the tension of the mooring ropes. The comparison between the experimental and computational results shows that the current computational me...

Yucheng Li - One of the best experts on this subject based on the ideXlab platform.

  • Numerical analysis of hydrodynamic behaviors of two net cages with grid mooring system under wave action
    China Ocean Engineering, 2012
    Co-Authors: Chang-ping Chen, Guohai Dong, Yun Peng Zhao, Yucheng Li, Yan-na Zheng
    Abstract:

    Based on rigid kinematics theory and lumped mass method, a mathematical model of the two net cages of grid mooring system under waves is developed. In order to verify the numerical model, a series of physical model tests have been carried out. According to the comparisons between the simulated and the experimental results, it can be found that the simulated and the experimental results agree well in each wave condition. Then, the forces on the mooring lines and the Floating Collar movement are calculated under different wave conditions. Numerical results show that under the same condition, the forces on the bridle ropes are the largest, followed by forces on the main ropes and the grid ropes. The horizontal and the vertical Float Collar motion amplitudes increase with the increase of wave height, while the relationship of the horizontal motion amplitude and the wave period is indistinct. The vertical motion amplitude of the two cages is almost the same, while on the respect of horizontal motion amplitude, cage B (behind cage A, as shown in Fig. 4) moves much farther than cage A under the same wave condition. The inclination angle of the Floating system both in clockwise along y axis and the counter one enlarges a little with the increase of wave height.

  • Analysis of hydrodynamic behaviors of gravity net cage in irregular waves
    Ocean Engineering, 2011
    Co-Authors: Tiao-jian Xu, Guohai Dong, Yun Peng Zhao, Yucheng Li
    Abstract:

    Abstract Based on the lumped-mass method and rigid-body kinematics theory, a mathematical model of a gravity cage system attacked by irregular waves is developed to simulate the hydrodynamic response of cage system, including the maximum tension of mooring lines and the motion of Float Collar. The normalized response amplitudes (response amplitude operators) are calculated for the cage motion response in heave and surge, and the mooring line tension response, in regular waves. In addition, a statistical approach is taken to determine the motion and tension transfer functions in irregular waves. In order to validate the numerical model of a gravity cage attacked by irregular waves, numerical predictions have been compared with the experimental observations in the time and frequency domain. The effect of wave incident angle on the Float Collar motion, mooring line tension and net volume reduction of the gravity cage system in irregular waves is also investigated. The results show that at high frequencies, the cage system has no significant heave motion. It tends to contour itself to longer waves. The variation amplitude of mooring line forces decreases as the wave frequency increases. With the increasing of wave incident angle, the horizontal displacement of the Float Collar increases.