Numerical simulation of water entry of two-dimensional structures with complex geometry using a CIP-based model

Zheng, Kaiyuan; Zhao, Xizeng; Yan, Dongming

doi:10.1016/j.apor.2020.102379

Cited by 26 publications

(4 citation statements)

References 34 publications

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“…Additionally, in [64] investigators proposed a method in their work to address spurious pressure oscillations observed in simulating moving boundary flow problems with sharp-interface immersed boundary (IB) methods. In another study [65], researchers implemented a modified ghost-cell immersed boundary method for the treatment of water entry of two-dimensional structures with complex geometry. Researchers investigating sedimentation challenges have extensively applied the Immersed Boundary(IB) method approach, as evidenced by studies conducted in [14,16,58,[66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Two dimensional simulations to study the relationship between settling velocity and flexibility of a particle

Panghal,

Ghosh,

Sharma

2024

Phys. Scr.

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In various industrial and real-life scenarios, sedimentation, whether involving flexible fibres, permeable structures, or a combination of both, plays a pivotal role. Its impact spans from influencing paper properties to waste water treatment and microorganism transport dynamics. Understanding sedimentation is crucial for optimizing processes like flocculation, organic matter removal, and particulate material management. Settling velocity, a key metric, is vital in designing instruments and formulating optimization strategies across environmental engineering and sediment transport. Despite extensive research on settling velocity correlations with viscosity, structure density, and permeability, the relationship with structural flexibility remains unexplored. This study employs the ImmersedBoundary (IB) method, utilizing a MATLAB code to numerically investigate the correlation between settling velocity and the flexibility of settling structures, addressing a gap in prior research. The results demonstrate a robust correlation between settling velocity and flexibility, supported by high R-squared values (ranging from 0.9979 to 1) for exponential fits across all discussed cases. TheR-squared value, a statistical measure assessing model accuracy, reinforces the superiority of the exponential fit in describing the settling velocity-flexibility relationship. To confirm the optimal fit, we conducted fitting attempts with various curve types using MATLAB, encompassing polynomial, Fourier, and smooth spline curves for both impermeable and permeable structures. The exponentialcurve consistently emerged as the most fitting model in this context.In our recent research, we conducted a sensitivity analysis focusing on the time-step to validate the robustness of our findings. The investigation encompassed both impermeable and permeable scenarios for the structures under study. The time-step was systematically varied across a specified range, revealing a notable outcome: the results demonstrated a consistent independence from the chosen time-step values.

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Section: Introductionmentioning

confidence: 99%

Two dimensional simulations to study the relationship between settling velocity and flexibility of a particle

Panghal,

Ghosh,

Sharma

2024

Phys. Scr.

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“…With the rapid development of computer technology, the numerical method has become a mainstream research method owing to its essential advantages of low cost and fast calculating speed compared to the other two methods. The traditional mesh-based numerical methods, such as the volume of fluid (VOF) [4,5], the finite volume method (FVM) [6], the boundary element method (BEM) [7], and the constrained interpolation profile (CIP) [8], are widely applied in simulating phenomena of fluid-structure interactions. However, meshes generated by these methods are prone to distortions, leading to inaccurate calculation results when applied to problems involving large deformations of free interfaces, such as the water entry of a torpedo.…”

Section: Introductionmentioning

confidence: 99%

Study on Water Entry of a 3D Torpedo Based on the Improved Smoothed Particle Hydrodynamics Method

Cai,

Wu,

Han

et al. 2024

Applied Sciences

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The water entry of a torpedo is a complex nonlinear problem, involving transient impact, free surface deformation, droplet splashing, and fluid–structure coupling, which poses severe challenges to traditional mesh methods. The meshless smoothed particle hydrodynamics (SPH) method shows unique advantages in capturing the complex features of the water entry of the torpedo at different entry angles. However, it still suffers from some inherent shortcomings, such as low surface discretization accuracy, poor discretization flexibility, and low calculation efficiency. In this study, an improved adaptive SPH algorithm is proposed to investigate the water entry of the torpedo accurately and efficiently. This method integrates meshless point generation and adaptive techniques simultaneously. The numerical results demonstrate that when the torpedo vertically enters the water at different velocities, the induced impact loads acting on the head of the torpedo fluctuate significantly with two peak values in the initial stage and thereafter stabilize in a later stage. The impact load acting on the torpedo, the entry depth of the torpedo, the splash height of the droplets, and the size of the cavity generated around the torpedo increase with the increment in the entry velocity. When the torpedo enters the water at different entry angles under the same initial entry velocity, both the vertical and the horizontal movements of the torpedo are observed, which results in more complex variations in parameters along the x- and y-axes. The findings and the corresponding numerical method in this study can provide a certain basis for the future designs of the entry trajectory and the structural bearing capacity of torpedoes.

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“…[14]. A CIP-based model for the water-entry of the two-dimensional structures with complex geometry, which was the highorder difference model, was given by Zheng, Zhao, and Yan [15].…”

Section: Introductionmentioning

confidence: 99%

Structural response characteristics of TMA during water-entry procedure

Hao,

2023

J. Phys.: Conf. Ser.

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This work presents a comprehensive numerical investigation of the structural responses of the Trans-Medium Aircrafts (TMA) during a water-entry event and the max mises-stress, the acceleration, and the water-entry deepness are analyzed and discussed. The simulating finite element model of the elastic field and the fluid field are imitated and solved by the coupled euler lagrange (CEL) method. The water-entry velocity is set from 0 m/s to 8 m/s. From the results, the max mises-stress is about 24 MPa and the max acceleration of all simulation conditions is 110000 m/s2. Considering the elastic effect of the TMA structure, the current research is of great importance to the TMA’s structural design scheme.

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Numerical simulation of water entry of two-dimensional structures with complex geometry using a CIP-based model

Cited by 26 publications

References 34 publications

Two dimensional simulations to study the relationship between settling velocity and flexibility of a particle

Two dimensional simulations to study the relationship between settling velocity and flexibility of a particle

Study on Water Entry of a 3D Torpedo Based on the Improved Smoothed Particle Hydrodynamics Method

Structural response characteristics of TMA during water-entry procedure

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