Tiezhi Sun

Dalian University of Technology

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Guiyong Zhang

Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration

Zhi Zong

Dalian University of Technology

Li Zou

Dalian University of Technology

Rundong Zhang

Chongqing University

Huakun Huang

Hong Kong Polytechnic University

Yingjie Wei

Harbin Institute of Technology

Zihao Wang

Dalian University of Technology

Yichen Jiang

Dalian University of Technology

Bo Zhou

Dalian University of Technology

Hao Xu

Dalian University of Technology

Cooperative Institutions

Dalian University of Technology

Harbin Institute of Technology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration

Shanghai Jiao Tong University

Tsinghua University

Wuhan Ship Development & Design Institute

Xi'an Jiaotong University

Chongqing University

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Experimental study on transformation and energy properties of depression internal solitary wave over a bottom step

Physics of Fluids (2021)

Li Zou Zehua Wen Tiezhi Sun Xinyu Ma Xueyu Wang

Waveform deformation and breaking are widespread phenomena when internal solitary waves (ISWs) encounter changing topographies, which have been observed in many parts of oceans. In this study, experiments are performed in a series of combinations of bottom step topographies with different heights and ISWs in different amplitudes within a two-layer stratified fluid system. According to experimental results, the evolution processes of ISWs over the bottom step are classified into four typical regimes as the wave–step interaction varying from weak to strong, which are the transmission regime, transitional regime, breaking regime, and reflection regime, corresponding to the evolution patterns of steady passage, deformation, breaking, and strong reflection, respectively. To describe the intensity of wave–step interaction, a new improved interaction parameter is proposed, which takes both relative amplitude of ISWs and relative topography changes into consideration, and achieved better effectiveness in defining the boundaries between different regimes. In terms of energy properties, with the wave–step interaction becoming stronger, the transmission ratio keeps decreasing throughout all regimes, while the reflection wave starts to appear since the breaking regime and its energy keeps increasing. At the critical point between the breaking regime and reflection regime, the reflection ratio equals the transmission ratio, and the energy loss ratio reaches its maximum.

Reflection

Critical point (mathematics)

10.1063/5.0038875

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Citations (11)

Joint proper orthogonal decomposition: A novel perspective for feature extraction from multivariate cavitation flow fields

Ocean Engineering (2023)

Zihao Wang Guiyong Zhang Huakun Huang Hao Xu Tiezhi Sun

Interpretability

Representation

Feature (linguistics)

10.1016/j.oceaneng.2023.116003

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Citations (8)

An efficient numerical algorithm based on the lattice Boltzmann flux solver for trans-media hydrodynamic problems

Ocean Engineering (2024)

Yunpeng Lu Guiyong Zhang Haoran Yan Heng Wang Xi Yang

Lattice Boltzmann methods

Solver

10.1016/j.oceaneng.2024.120117

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Citations (0)

Analysis of Non-Dimensional Parameters for Double-Row Jet Hydraulic Collection Method on Flow Field Characteristics

Li Zou Yanqing Dong Guoqing Jin Zongbing Yu Tiezhi Sun

Mineral collecting technology is both a core functional module and a major source of perturbation in deep-sea mining. Achieving low environmental disturbance and high collection efficiency in collection technology remains a challenging issue nowadays. In this study, the numerical simulation method validated by experimental results is used to analyze the effects of structural and dynamical dimensionless parameters on the flow field characteristics for the double-row jet hydraulic collection method. The results indicate that with the increase of the velocity ratio, the bottom flow pattern can be divided into three stages: jet dominated, transition and suction dominated. When the suction velocity remains constant, the bottom flow pattern gradually shifts to a suction-dominant state as the suction pipe width increases Average vertical velocity elevates with the narrowing of the suction width (b) at fixed Re settings. Furthermore, the bottom flow pattern gradually shifts to jet-dominated state as the ratio of nozzle distance from suction pipe to suction pipe width increases. Finally, the relative lifting force decreases exponentially with the increase in the relative diameter. The prioritization of three length parameters for bottom flow field impacts was achieved.

10.2139/ssrn.4670646

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Citations (0)

10.1063/5.0065967.16

Default Digital Object Group (2021)

Tiezhi Sun Rundong Zhang Guiyong Zhang

This paper explores the physical phenomena of different-density spheres passing vertically through a stratified liquid containing high-viscosity dimethicone on the water surface. High-speed photography to monitor the cavity evolution and a hydrophone used to record the acoustic features. The results show that the thickness of the dimethicone layer and the density of the sphere have a significant impact on the shape of the splash crown, especially regarding the form of surface sealing and the time at which it occurs. As the thickness of the dimethicone layer increases and the density of the sphere decreases, the shrinkage time of the splash crown of the water layer is delayed, and the number of surface sealing events tends to decrease. Furthermore, the thickness of the dimethicone layer has a significant effect on the deep pinch-off phenomenon for high-density spheres and exhibits a weaker influence on low-density spheres. Moreover, examination of the acoustic signals indicates that the cavity evolution is closely related to acoustic properties, and the thickness of the dimethicone layer presents different effects at different stages of the entering process. These results indicate that the dimethicone layer and the density of the spheres have a considerable influence on cavity development and acoustic features in the wake of water entry.

Hydrophone

10.1063/5.0065967.16

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Non-Boussinesq effect on the internal solitary wave propagation under a Lagrangian-like description for various pycnocline thickness conditions

Physica D Nonlinear Phenomena (2023)

Jiuming Zhang Li Zou Tiezhi Sun Xinyu Ma Hao Wang

Pycnocline

Wavenumber

10.1016/j.physd.2023.134007

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Citations (1)

Development and Application of a Fluid Mechanics Analysis Framework Based on Complex Network Theory

Zihao Wang Guiyong Zhang Tiezhi Sun Bo Zhou

10.2139/ssrn.4970365

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Experimental study of the effects of a viscous liquid layer on the cavity dynamics of vertical entry by a sphere into water at low Froude number

Physics of Fluids (2021)

Tiezhi Sun Heng Wang Chongbin Shi Zhi Zong Guiyong Zhang

The water entry process is relevant to a wide range of engineering applications and has been extensively investigated. Most liquids used in such studies are single-layered, and little attention has been paid to how the structure of a two-layer liquid system affects the splash and cavity formation. In this study, we use high-speed photography to experimentally investigate the water entry of a sphere after it has passed vertically through a layer of highly viscous liquid (dimethicone) at a low Froude number. We investigate the effects of different thicknesses of this dimethicone layer and find that the formation of the splash crown is closely related to both the thickness and the Froude number. In a certain range of dimethicone thickness, the height of the splash interface decreases with the increasing thickness and increases with the decreasing Froude number. The dimensionless interface height at the pinch-off time is found to have a linear relationship with the dimensionless initial velocity of the sphere. Furthermore, the formation of the cavity, including its length and pinch-off depth, depends on the Froude number. However, the pinch-off time is almost independent of the dimethicone thickness and the Froude number, and the cavity length is nearly independent of the dimethicone thickness for all Froude numbers examined.

Froude number

Dimensionless quantity

10.1063/5.0032818

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Citations (29)

Identification of control equations using low-dimensional flow representations of pitching airfoil

Physics of Fluids (2024)

Zihao Wang Guiyong Zhang Bo Zhou Tiezhi Sun Jinxin Wu

This study investigates the application of data-driven modeling techniques for understanding the complex dynamics of pitching airfoils at low Reynolds numbers and high angles of attack. Linear and nonlinear dimensionality reduction methods, namely principal component analysis (PCA) and isometric mapping (ISOMAP), are employed to obtain low-dimensional representations of the flow field. Subsequently, sparse identification of nonlinear dynamics (SINDy) is utilized to model the governing equations. The key findings are as follows: PCA primarily captures linear information, with the first two to three dimensions maintaining relatively low reconstruction errors. In contrast, ISOMAP excels in capturing nonlinear features, exhibiting noticeably smaller reconstruction errors. The main information is concentrated in the two-dimensional plane constructed by PCA1 and PCA2 (or ISOMAP1 and ISOMAP2). Differences in trajectory planes formed by combinations of other axes reflect flow field disparities. ISOMAP provides a nonlinear low-dimensional representation, advantageous for capturing nonlinear relationships between flow field characteristics and governing equations. The combination of ISOMAP and SINDy yields virtually no errors in identifying governing equations. Conversely, PCA and SINDy result in significantly different linear trajectories, leading to higher reconstruction errors. The identified governing equations using ISOMAP and SINDy remain consistent across different datasets, demonstrating the method's stability and robustness in accurately characterizing flow field properties under similar conditions.

Isomap

Robustness

10.1063/5.0205170

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Citations (1)

Hydrodynamic performance of a water-air trans-media flying submersible vehicle

Ocean Engineering (2024)

Deshun Lu Wei Lin Jinxiong Duan Tiezhi Sun

10.1016/j.oceaneng.2024.118102

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Citations (2)