CFD Modeling of Regular and Irregular Waves Generated by Flap Type Wave Maker

Eldeen, Ali Shehab Shams; El-Baz, Ahmed; Elmarhomy, None Abdalla Mostafa

doi:10.37934/arfmts.85.2.128144

Cited by 6 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where ߩ is the density of the seawater, ݃ is the gravitational acceleration, ‫ܪ‬ ‫݉‬ is the significant wave height, and ܶ is the periodic time of the incident wave. The average power of the nonlinear wave is investigated using equation (25) and is equal to 40 W at a significant wave height of 380 mm according to Pierson-Moskowitz's nonlinear wave model spectrum [36], and the width of the floating body is 346 mm. The dynamic response of the floating body was recorded and presented in Figure 9 showing the time domain of the vertical position in mm in the first two minutes of the operation.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Energy Harvesting PTO Against Nonlinear Waves Using Control System

Farag,

Shehab

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Many systems include turbines, linear electromagnetic or hydroelectric components, as well as wave energy converters designed particularly for energy harvesting from ocean and sea waves. While each of these methods has its merits, it is also feasible to harvest a considerable quantity of energy generated by the sea and ocean waves. Wave energy is considered a renewable and ecologically friendly energy source. It is harvested through wave energy converters and is particularly useful to coastal nations. In this paper, a mechanical motion rectifier (MMR) is proposed to convert the bidirectional reciprocating movement of a floating body above the nonlinear wave into a rotating movement in one direction. Experimental investigations are carried out to examine the performance of the system. An experimental wave tank was built to produce nonlinear waves by controlled flapper motion. Mechanical and electrical efficiency were investigated for both systems. Through the use of a generator, the energy can be taken in the form of electrical energy and stored in appropriate batteries, resulting in clean and sustainable energy from the sea’s waves.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhancement of Energy Harvesting PTO Against Nonlinear Waves Using Control System

Farag,

Shehab

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Due to creating a numerical mesh using a VOF-RANS model for free surface tracking without investing time to create a new code, Flow-3D hydrodynamic model from Flow Science Inc. has been employed. The volume-of-fluid (VOF) approach [27,28] presents the fraction F of the cell filled with fluid as F = 0 outside the fluid domain, F = 1 within the interior of the fluid, and 0 < F < 1 for cells that are cut by a boundary. The general mass continuity equation using the fluid fraction can be written as:…”

Section: Reynolds Averaging and Vof Approachmentioning

confidence: 99%

Diffusion of a Surface Marine Sewage Effluent

Sahameddin Mahmoudi Kurdistani,

Gianluca Cosimo Perrone

2023

CFDL

View full text Add to dashboard Cite

Any scalar concentration discharging to the sea through a freshwater release is a thermodynamic two-phase flow including different densities and different temperatures. Because of Reynolds similarity, physical models are not feasible to use and numerical models such as CFD-RANS are the solutions. A series of numerical experiments have been conducted to derive an empirical formula that determines the length of the 95% scalar concentration reduction, useful for primary and emergency engineering-environmental decisions. Results show that the scalar concentration intrusion length is a function of seawater density-temperature, freshwater density-temperature, sea current Froude number, effluent jet Froude number, and the scalar concentration in which among those, the sea current Froude number has the most effective role in which as an example of the lowest and highest tested sea current velocities, an effluent discharge of 0.052 m3/s with a concentration of 1 Kg/m3 and effluent jet velocity 0.245 m/s in 3.2 meters from the effluent source reaches to the 95% scalar concentration reduction when there is a high-velocity sea current (0.5 m/s) while in the presence of a low-velocity sea current (0.05 m/s), the same effluent discharge with the same scalar concentration and the same effluent jet velocity, the length of the 95% scalar concentration reduction increase to 42.8 meters from the effluent source.

show abstract

“…The SIMPLEC (Semi-Implicit Method for Pressure-Linked Equations-Consistent) algorithm is the basis of the pressure-velocity coupling system. The realizable k-Ԑ turbulence model is applied when there is flow Ali Shehab [14] and Ariffin [15]. In the numerical simulation, air is utilized as the working medium, and an ideal gas density is assumed.…”

Section: Numerical Detailsmentioning

confidence: 99%

Numerical Modeling and Geometry Enhancement of a Reactive Silencer

Ismail

Elmarhomy

Morgan

et al. 2023

ARFMTS

View full text Add to dashboard Cite

Internal combustion engines and blowers frequently utilize silencers to reduce exhaust noise. In the current paper, the transmission loss of reactive silencers is predicted using the plane wave decomposition method and a three-dimensional (3-D) time-domain computational fluid dynamics (CFD) approach. A mass-flow-inlet boundary condition is first used to perform a steady flow computation, which serves as an initial condition for the two subsequent unsteady flow computations. At the model's inlet, an impulse (acoustic excitation) is placed over the constant mass flow to perform the first unstable flow computation. Once the impulse has fully propagated into the silencer, the non-reflecting boundary condition (NRBC) is then added. For the scenario without acoustic excitation at the inlet, a second unsteady flow computation is performed. During the two transient computations, the time histories of the pressure and velocity at the upstream measuring points as well as the history of the pressures at the downstream measuring point are recorded. The related acoustic quantities show variations between the two unsteady flow computational findings. As a result, the transmitted sound pressure signal is just the sound pressure downstream, while the incident sound pressure signal is obtained by utilizing plane wave decomposition upstream. The transmission loss (TL) of the silencer is then calculated after the Fast Fourier Transform (FFT) converts the two sound pressure signals from the time domain to the frequency domain. The numerical calculations and the reported data are in good agreement for the published results, in addition to geometry enhancement by increasing number of holes in the cross section for muffler.

show abstract

CFD Modeling of Regular and Irregular Waves Generated by Flap Type Wave Maker

Cited by 6 publications

References 16 publications

Enhancement of Energy Harvesting PTO Against Nonlinear Waves Using Control System

Enhancement of Energy Harvesting PTO Against Nonlinear Waves Using Control System

Diffusion of a Surface Marine Sewage Effluent

Numerical Modeling and Geometry Enhancement of a Reactive Silencer

Contact Info

Product

Resources

About