Numerical analysis on three-dimensional green water events induced by freak waves

The green water phenomenon is boarding of sea water onto the deck due to high amplitude waves, which can cause several damages to the equipment on deck. In the present paper the green water phenomenon on three-dimensional models is analyzed using the Moving Particles Semi-Implicit Method (MPS), a fully lagrangian method for incompressible flow. This work is focused on the validation of the method comparing the numerical results with experimental results for green water on reduced scale models. The pressure on sensors over the deck of the models shows good agreement with experimental data.

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Numerical Analysis of Heat Transfer for Steady Three-Dimensional Compressible Flow in Long Microchannels

Journal of Enhanced Heat Transfer ◽

10.1615/jenhheattransf.v12.i2.30 ◽

2005 ◽

Vol 12 (2) ◽

pp. 171-188 ◽

Cited By ~ 4

Author(s):

Ching-Shung Chen

Keyword(s):

Heat Transfer ◽

Numerical Analysis ◽

Compressible Flow ◽

Three Dimensional

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Three dimensional numerical analysis of heat transfer during spray quenching of 22MnB5 steel with a single nozzle

Heat and Mass Transfer ◽

10.1007/s00231-020-02992-w ◽

2020 ◽

Author(s):

Emre Bulut ◽

Gökhan Sevilgen ◽

Ferdi Eşiyok ◽

Ferruh Öztürk ◽

Tuğçe Turan Abi

Keyword(s):

Heat Transfer ◽

Numerical Analysis ◽

Three Dimensional ◽

22Mnb5 Steel

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Optimization of the Navy’s three-dimensional mine impact burial prediction simulation model, Impact35, using high-order numerical methods

The Journal of Defense Modeling and Simulation Applications Methodology Technology ◽

10.1177/15485129211028661 ◽

2021 ◽

pp. 154851292110286

Author(s):

Athanasios Donas ◽

Ioannis Famelis ◽

Peter C Chu ◽

George Galanis

Keyword(s):

Numerical Analysis ◽

Numerical Methods ◽

Prediction Model ◽

Simulation Model ◽

Three Dimensional ◽

Simulation System ◽

High Order ◽

Alternative Methodology ◽

Runge Kutta ◽

Fifth Order

The aim of this paper is to present an application of high-order numerical analysis methods to a simulation system that models the movement of a cylindrical-shaped object (mine, projectile, etc.) in a marine environment and in general in fluids with important applications in Naval operations. More specifically, an alternative methodology is proposed for the dynamics of the Navy’s three-dimensional mine impact burial prediction model, Impact35/vortex, based on the Dormand–Prince Runge–Kutta fifth-order and the singly diagonally implicit Runge–Kutta fifth-order methods. The main aim is to improve the time efficiency of the system, while keeping the deviation levels of the final results, derived from the standard and the proposed methodology, low.

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Air Ventilation Performance of School Classrooms with Respect to the Installation Positions of Return Duct

Sustainability ◽

10.3390/su13116188 ◽

2021 ◽

Vol 13 (11) ◽

pp. 6188

Author(s):

Sungwan Son ◽

Choon-Man Jang

Keyword(s):

Air Quality ◽

Numerical Analysis ◽

Indoor Air Quality ◽

Indoor Air ◽

Three Dimensional ◽

Cross Infection ◽

School Students ◽

Height Range ◽

Air Ventilation ◽

Ventilation Performance

For students, who spend most of their time in school classrooms, it is important to maintain indoor air quality (IAQ) to ensure a comfortable and healthy life. Recently, the ventilation performance for indoor air quality in elementary schools has emerged as an important social issue due to the increase in the number of days of continuous high concentrations of particulate matter. Three-dimensional numerical analysis has been introduced to evaluate the indoor airflow according to the installation location of return diffusers. Considering the possibility of the cross-infection of infectious diseases between students due to the direction of airflow in the classroom, the airflow angles of the average respiratory height range of elementary school students, between 1.0 and 1.5 m, are analyzed. Throughout the numerical analysis inside the classroom, it is found that the floor return system reduces the indoor horizontal airflow that causes cross-infection among students by 20% compared to the upper return systems. Air ventilation performance is also analyzed in detail using the results of numerical simulation, including streamlines, temperature and the age of air.

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