Numerical Simulation of Ship Maneuvering Motions in Viscous Flow

2009 ◽  
Vol 419-420 ◽  
pp. 677-680
Author(s):  
Dong Li Li ◽  
Liang Yang ◽  
Hong Yu Zhang ◽  
Tian Shu Peng
Keyword(s):  
Numerical Simulation ◽  
Viscous Flow ◽  
Simulation Method ◽  
Turing Test ◽  
The Body ◽  
Ship Maneuvering ◽  
Motion Simulator ◽  
Real Size ◽  
Cfd Method ◽  
Viscous Flow Field

In this paper, based on CFD method and dynamic mesh technology, the ship maneuvering performance is predicted in viscous flow. Numerical computation models are built to realize the simulation of the ship maneuvering motions such as static drift test, static rudder test, pure yaw test and pure sway test. Hydrodynamic forces and moments acting on a maneuvering ship are obtained in the body-fixed coordinate system. The computational results are compared with data of potential theory method. Then based on VC code, a simulator of ship maneuvering motions is built to simulate ship Zigzagging and Turing test. The results show that the present numerical simulation method and the ship maneuvering motion simulator are able to be used in numerical simulation of the real size ship maneuvering motions in viscous flow field.

Numerical Simulation of Ship Motions in Regular and Irregular Waves

2019 ◽  
Vol 53 (1) ◽  
pp. 97-106
Author(s):  
Bao-Ji Zhang ◽  
Jie Liu ◽  
Ning Xu ◽  
Lei Niu ◽  
Wen-Xuan She
Keyword(s):  
Numerical Simulation ◽  
Wave Length ◽  
Simulation Method ◽  
Irregular Waves ◽  
Navier Stokes ◽  
Ship Motions ◽  
Vof Model ◽  
Split Operator ◽  
Strip Theory ◽  
Cfd Method

AbstractA numerical simulation method is presented in this study to predict ship resistance and motion responses in regular and irregular waves. The unsteady RANS (Reynolds Average Navier-Stokes) method is selected as the governing equation, and a volume of fluid (VoF) model is used to capture the free surface, combining the k-ε equations. A finite volume method (FVM) is utilized to discretize both the RANS equations and VoF transport equation. The pressure implicit split operator (PISO) method is set as the velocity-pressure coupling equation. The overset mesh technique is utilized to simulate ship motions in waves. A DTMB5415 ship is selected as a case study to predict its pitch and heave responses in regular and irregular waves at different wave length and wave steepness. The ship is free to move in the pitch and heave directions. The CFD (Computational Fluid Dynamics) results are found to be in good agreement with the strip theory and experimental data. It can be found that the CFD method presented in this study can provide a theoretical basis and technical support for green design and manufacture of ships.

Numerical Simulation of Viscous Flow Field around Ships in Ballast

2016 ◽  
Vol 320 ◽  
pp. 911-922 ◽  
Author(s):  
Wan-zhen Luo ◽  
Chun-yu Guo ◽  
Tie-cheng Wu ◽  
Sai-shuai Dai ◽  
Yu-min Su
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Viscous Flow ◽  
Viscous Flow Field

Structure Optimization Design and Airflow Numerical Simulation for Negative Pressure Isolated Cabin

2012 ◽  
Vol 490-495 ◽  
pp. 876-879
Author(s):  
Yan Jun Zhang ◽  
Feng Tian ◽  
Jian Yang ◽  
Qiu Ming Sun ◽  
Ming Xi Hu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Negative Pressure ◽  
Optimization Design ◽  
Structure Optimization ◽  
The Body ◽  
Air Flow Rate ◽  
Design Requirements ◽  
Cfd Method ◽  
Structure Optimization Design

Structure optimization design of negative-pressure isolated cabin and numerical simulation for airflow are preformed by using CFD method，and trace of expiration contamination by patient are studied. Results show that when area of outlet setting as 4235mm2, the negative pressure in cabin reached -31.96 Pa meeting to the design requirements. And air flow rate near the head of the body are 0.14m/s, which is comfort for human and closing to test value(0.11m/s). Flow rate and pressure in the cabin distributed evenly in the most of the space of cabin, by which bio-safety and comfort was assured . Results also show that fresh air, after fully spreading, formed airflow to the feet above chest which can drive contaminants expelling from the mouth forming one-way flow to the feet direction, which can ensure maximum exhaust to discharge from cabin and air quality in the cabin improved.

scholarly journals Simulation of vertical tidal turbine based on OpenFOAM and influence of inlet turbulence

2019 ◽  
Vol 272 ◽  
pp. 01017
Author(s):  
Liu Yun-ya ◽  
Yu-chen Yang ◽  
Ya-wen Yang
Keyword(s):  
Numerical Simulation ◽  
Turbulence Model ◽  
Cfd Simulation ◽  
Vertical Axis ◽  
Simulation Method ◽  
Hydrodynamic Characteristics ◽  
Numerical Simulation Method ◽  
Tidal Turbine ◽  
Cfd Method ◽  
Control Equation

This paper first introduces the basic theory of CFD method, including basic control equations, finite volume method, control equation solving algorithm and turbulence model selection. Second, based on OpenFOAM, an open-source fluid mechanics software, a numerical simulation method of vertical axis tidal turbine was proposed by using k-ω SST turbulence model and PIMPLE algorithm. The hydrodynamic characteristics of the vertical axis turbine were studied, and the calculation results were compared with experiments. The higher consistency proves the feasibility of the numerical simulation method proposed in this paper. Finally, the influence of inlet turbulence on numerical simulation was explored, and a set of effective CFD simulation strategies was concluded, which provided a valuable reference for future CFD simulation and research on vertical axis tidal turbines.

Precision Analysis of Simulation Systems with Hardware-in-Loop Caused by Performance of Three-Axis Virtual Flight Motion Simulator

2011 ◽  
Vol 383-390 ◽  
pp. 4860-4864
Author(s):  
Tao Wang ◽  
Ming Chao Zhu ◽  
Sheng Li Yin ◽  
Hong Guang Jia
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Simulation System ◽  
Visual Simulation ◽  
Mechanical Device ◽  
Load Torque ◽  
Motion Simulator ◽  
Hardware In Loop ◽  
Simulation Systems ◽  
Main Factor

Simulation systems with hardware-in-loop are composed by three-Axis virtual flight motion simulator, simulation computer, load torque simulator, and visual simulation systems. Three-Axis Virtual Flight Motion Simulator are used to simulate the attitude of missile in simulation system with hardware-in-loop, so its performance influenced the result of simulation directly. This paper mainly analyzed the factors which influenced the performance of a three-Axis virtual flight motion simulator which we are used now in the lab, then analyzed the entire simulation system’s error caused by these factors through numerical simulation method. By analysis we can see that bandwidth is the main factor influenced the precision of simulation systems with hardware-in-loop, mechanical device installation error and measurement error may also cause some errors of the systems at the same time.

Tail shapes lead to different propulsive mechanisms in the body/caudal fin undulation of fish

2020 ◽  
pp. 095440622096768
Author(s):  
Jialei Song ◽  
Yong Zhong ◽  
Ruxu Du ◽  
Ling Yin ◽  
Yang Ding
Keyword(s):  
Numerical Simulation ◽  
Aspect Ratio ◽  
High Efficiency ◽  
The Body ◽  
Caudal Fin ◽  
Fish Model ◽  
Swimming Efficiency ◽  
Simulation Results ◽  
Propulsive Mechanism ◽  
High Depth

In this paper, we investigate the hydrodynamics of swimmers with three caudal fins: a round one corresponding to snakehead fish ( Channidae), an indented one corresponding to saithe ( Pollachius virens), and a lunate one corresponding to tuna ( Thunnus thynnus). A direct numerical simulation (DNS) approach with a self-propelled fish model was adopted. The simulation results show that the caudal fin transitions from a pushing/suction combined propulsive mechanism to a suction-dominated propulsive mechanism with increasing aspect ratio ( AR). Interestingly, different from a previous finding that suction-based propulsion leads to high efficiency in animal swimming, this study shows that the utilization of suction-based propulsion by a high- AR caudal fin reduces swimming efficiency. Therefore, the suction-based propulsive mechanism does not necessarily lead to high efficiency, while other factors might play a role. Further analysis shows that the large lateral momentum transferred to the flow due to the high depth of the high- AR caudal fin leads to the lowest efficiency despite the most significant suction.

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