Numerical and experimental study of internal solitary wave loads on tension leg platforms

Wang, Xu; Zhou, Jifu

doi:10.1007/s42241-021-0015-y

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…It can be seen from the figure that the numerical simulation results are in good agreement with the experimental results, indicating that the dynamic pressure induced by ISWs obtained by numerical calculation in the current numerical According to the analysis of the dynamic pressure induced by the ISW in Section IV-C, the relationship between the maximum dynamic pressure induced by the ISW and its amplitude can be described by equation (12) based on the MCC theory. When the density and depth of the upper and lower fluids are known, as long as the maximum dynamic pressure induced by the ISW through the piezoelectric sensor is obtained, the amplitude of the current ISW can be inverted by equation (12). TABLE V shows the comparison between the amplitude inversion value of ISW and the measured value under various working conditions, in which the measured amplitude is obtained by the conductivity probe array installed in the IWF.…”

Section: E Internal Solitary Flume Experimentssupporting

confidence: 70%

“…Zhi et al [10] established the theory of ISW propagation and evolution over slope-shelf topography based on the two-layer fluid numerical flume model of finite water depth and verified it by numerical method. Zhang et al and Wang et al [11]- [12] proposed an accurate and controllable numerical flume to calculate the interaction between ISWs and structures At present, the observation or the study of ISWs mainly focuses on either the changes of velocity, temperature, density and salinity in seawater induced by the ISWs, or the characteristics of sea surface convergence and divergence caused by the ISW propagation. However, the sudden strong flow induced by the ISW propagation will cause the change of dynamic pressure in the flow field, and there are few studies on the characteristics of dynamic pressure induced by the propagation of ISW.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Dynamic Pressure Characteristics Induced by an Internal Solitary Wave in a Two-Layer Fluid of Finite Depth

et al. 2022

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In this paper, the dynamic pressure characteristics induced by an internal solitary wave (ISW) in a two-layer fluid of finite depth are studied. A method for detecting ISWs by dynamic pressure is proposed. First, an accurate controllable ISW numerical flume is established based on the applicability conditions of three kinds of ISW theories. Then the relationship between the maximum dynamic pressure and the amplitude of the ISW under four density stratifications is studied. The results show that the dynamic pressure variation induced by the ISW is synchronous with that of interface displacement. Under the same density stratification, the maximum dynamic pressure has a strong linear relationship with the corresponding amplitude. Furthermore, the nonlinear error is less than 7 %, and the relationship is not affected by the ocean structure. According to the above characteristics of dynamic pressure, a series of dynamic pressure measurement experiments were carried out in a large internal wave flume (IWF) using a very low frequency (VLF) piezoelectric sensor. The experimental results show that the dynamic pressure measurement results are in good agreement with the numerical simulation results. Last, the Miyata-Choi-Camassa (MCC) theory is used to invert the measured maximum dynamic pressure to the amplitude of ISW, and compared with the measured amplitude, the maximum error is less than 6 %, which verifies the feasibility of the inversion method of ISW amplitude by using dynamic pressure measurement proposed in this paper, and provides a new method and idea for detecting ISW at sea in the future.INDEX TERMS Internal solitary wave, dynamic pressure, numerical flume, detection method.

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Section: E Internal Solitary Flume Experimentssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Investigation on Dynamic Pressure Characteristics Induced by an Internal Solitary Wave in a Two-Layer Fluid of Finite Depth

et al. 2022

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“…The dynamic pressure on the head gradually becomes larger than that on the tail, thus the C x gradually reverses to positive and reaches the positive maximum at 3 when the submarine enters the upper layer totally, as seen in Figure 12c. In stage III, the dynamic pressure on the head gradually becomes smaller than that on the tail, thus the positive C x decreases and reaches the negative maximum at 5 when the submarine encounters the pycnocline, as seen in Figure 12e. In stage IV, the submarine passes through the interface of the ISW again.…”

Section: Interaction Between Submarine and Isws With Different Pycnoc...mentioning

confidence: 95%

“…It was found that the motion response due to ISWs is much greater than the one due to surface waves. To further explore the interaction mechanism between platforms and ISWs Wang et al [4,5] conducted a series of laboratory experiments and numerical tests to investigate the ISW loads on a semi-submersible platform. The results indicated that the horizontal and vertical forces on the semi-submersible platform due to ISWs can be divided into three components, namely the wave pressure-difference force, viscous pressure-difference force, and the frictional force, in which the frictional force is negligible.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Internal Solitary Wave Forces on a Moving Submarine

Xie

Zhang

et al. 2022

JMSE

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A numerical model is developed to investigate the hydrodynamic characteristics of a moving submarine induced by internal solitary waves (ISWs) in continuously stratified fluids. A new numerical scheme for the generation of ISWs with a current is proposed, in which the forward speed of the submarine is equivalent to the current. The superposition of the velocity field obtained from extended Korteweg-de Vires (eKdV) theory and the velocity field of the current is taken as the initial velocity field in a numerical wave tank. Convergence analysis is conducted, while the present numerical model is validated by comparing it with experimental data. Then, the interaction between the moving submarine and the ISWs against different pycnocline thicknesses and different moving speeds is investigated. The proposed numerical model can produce accurate ISWs coupled with a current. It can be found that the hydrodynamic forces on the submarine decrease with the increment of pycnocline thickness. The moving speed of the submarine performs a significant effect on the horizontal force, but a light effect on the vertical forces and the torque. It is also found that the forces on the moving submarine cannot be considered as the linear superposition of the navigation resistance in still water and the forces induced by ISWs.

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