Numerical Simulation of Water Exit and Entry Using a Modified Ghost-Cell Immersed Boundary Method

Zheng, Kaiyuan; Zhao, Xizeng

doi:10.1007/978-981-15-0291-0_151

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…In addition, due to the complexity and low efficiency of water experiments [18,19], the repeatability and universality of the experiments are greatly reduced, and the efficiency of simulation analysis can make up for this deficiency. It solves the problem that the experimental method cannot easily obtain the flow field information around the motion process [20][21][22][23]. The quantitative relationship between the robot's own attributes, motion behavior, and performance can be quickly obtained by simulation analysis [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Simulation Analysis for Motions through Multiphase Environments

Wang,

Fan,

Liu

2023

Biomimetics

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The motion process and force of the jumper crossing a multiphase environment are of great significance to the research of small amphibious robots. Here, CFD (Computational Fluid Dynamics)-based simulation analysis for motions through multiphase environments (water–air multiphase) is successfully realized by UDF (user-defined function). The analytical model is first established to investigate the jumping response of the jumpers with respect to the jump angle, force, and water depth. The numerical model of the jumper and its surrounding fluid domain is conducted to obtain various dynamic parameters in the jumping process, such as jumping height and speed. Satisfactory agreements are obtained by comparing the error of repeated simulation results (5%). Meanwhile, the influence of the jumper’s own attributes, including mass and structural size, on the jumping performance is analyzed. The flow field information, such as wall shear and velocity when the jumper approaches and breaks through the water surface, is finally extracted, which lays a foundation for the structural design and dynamic underwater analysis of the amphibious robot.

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Section: Introductionmentioning

confidence: 99%

CFD-Based Simulation Analysis for Motions through Multiphase Environments

Wang,

Fan,

Liu

2023

Biomimetics

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“…Recently. Zheng and Zhao (2020) also used the modified host-cell immersed boundary method to investigate the water entry problem.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of two steps on the performance and longitudinal stability of a mono-hull high-speed craft

Sajedi

Ghadimi

2020

Cogent Engineering

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Transverse steps in modern high-speed craft can increase the longitudinal stability in addition to reducing frictional resistance. The porpoising instability can also be avoided by selecting the appropriate location and height of the transverse step. In the current paper, a non-step and a double-step model are investigated. The primary purpose of the present study is to examine the impact of second step on the stability and performance of the craft. Both models are generally identical. They are prismatic with a deadrise angle of 24 degrees, made of fiberglass, and are 2.64 meters long and 0.55 meters wide. The only difference between the two models is the bottom shape. One has two transverse steps, and the other has no step. These models are tested in a towing tank within a range of beam Froude numbers of 0.43 to 3.87. Measured parameters include rise-up of the bow and aft as well as center of gravity, trim, and resistance of the models. The obtained results indicate that through creating the second step, the longitudinal stability of the model increases, and the trim decreases. On the other hand, the double-step model has lower resistance in the pre-planing state.

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Numerical Simulation of Water Exit and Entry Using a Modified Ghost-Cell Immersed Boundary Method

Cited by 2 publications

References 13 publications

CFD-Based Simulation Analysis for Motions through Multiphase Environments

CFD-Based Simulation Analysis for Motions through Multiphase Environments

Experimental investigation of the effect of two steps on the performance and longitudinal stability of a mono-hull high-speed craft

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