Numerical solution for the second-order wave interaction with porous structures

Hsu, Hu-Hsiao; Wu, Yung-Chao

doi:10.1002/(sici)1097-0363(19990215)29:3<265::aid-fld784>3.0.co;2-5

Cited by 3 publications

(4 citation statements)

References 19 publications

(39 reference statements)

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“…3 and 4 represent a set of robust sub elements in the model. The computational model in FLOW-3D has the advantage of meeting engineering and hydraulic boundary conditions [5,17]. FLOW-3D was used to apply the model and create many scenarios for numerical simulation of the proposed breakwater.…”

Section: Numerical Moldingmentioning

confidence: 99%

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Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Badr Hussein,

Ibrahim

2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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The main objective of the breakwater systems is to protect the closed water yard from waves and storms, as they help bring calm inside the port and thus achieve safety for ships inside it, and ease of operation. This paper presents the results of the study on wave interaction with vertical slotted water breakers. The research was conducted on two breakwater models, each of which was defined as follows: The first breakwater has two perforated walls: the lower portion is porous, while the top part is solid, while the second wall is the polar opposite of the first, with a porosity of 50% in both. The second breakwater is similar to the first, but it lacks the horizontal slit wall. The first and second breakwaters were compared, and the result indicate that the first breakwater hydrodynamic output performance the second in the range (10-15 %).The second breakwater is affected by the wave force less in the range (85-90%) than its breaker first counterpart. On the models that have been tested, the wave's force increases as its relative length (h/L) increases. According to the results of this study, the transmission factor (kt) rises as the relative length (h / L) decreases, while the reflection factor (kr) decreases as the relative length (h / L) reduces. FLOW-3D has the ability to calculate the velocities in front and behind the breakwaters and can be used in similar studies.

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Section: Numerical Moldingmentioning

confidence: 99%

“…At (10) and At (11) The coefficients , , and might be computed by utilizing the matching criteria (i.e. adding( 9), (10), and( 11) with (4) as well as (5) the matrix formula at the breakwater:…”

Section: Analytical Studymentioning

confidence: 99%

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Badr Hussein,

Ibrahim

2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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“…A commercial CFD software package based on volume of fluid (VOF) labeled FLOW 3D was actually used for the numerical analysis of the scale curved breaker model. To achieve a convenient balance between accuracy and time, two distinct grids with different cell sizes were used [29]. Low frequency waves have mesh cells of 1 cm diameter in each direction, while high frequency waves have mesh cells with a diameter of 0.5 cm in each direction, as the greater the number of mesh cells, the higher the accuracy of the results [30].…”

Section: Numerical Modeling / Numeričko Modeliranjementioning

confidence: 99%

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hussein¹,

Ibrahim²

2022

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The purpose of breakwaters is to protect the ports, beaches, or beach facilities from strong waves and storms, as they help establish calm inside the port and thus achieve safety for ships and ease of operation. This paper presents an experimental and numerical study of unconventional alternatives to the vertical breakwater in order to evaluate the hydrodynamic performance of the proposed models. Two proposed cases for a semi-submerged breakwater were selected in the form of a half-pipe section with an inside diameter of 20 cm and a thickness of 1 cm. Case (a) was of the concave type of semicircular breakwater, while case (b) was of the convex type. Numerical modeling FLOW 3D was used to construct numerous scenarios for numerical simulation of the proposed breakwaters. The obtained results indicates that, when comparing the wave transmission coefficient (Kt) and its reflection coefficient (Kr) with the relative water depth (h/L), the transmission coefficient decreased with the relative height of the wave, while the reflection coefficient was completely reversed. In case (a), Kt was less than in case (b) at a range of 10% to 15%, while Kr in case (a) was bigger than in case (b) at a range of 5% to 10%. When the wave hit the breakwater, it was reflected back as its energy is dissipated in less water depth and its speed decreases as it approaches the port. The velocity of the wave decreases as it approaches the bottom, which means that the wave is affected by the depth of the water, i.e. the lower the water depth, the lower the wave velocity. Case (a) was more efficient and effective in wave dissipation, current velocity, and bed stability than case (b), so it is recommended to use case (a) due to its efficiency in protecting coastal areas and generating electricity.

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“…To apply the model and generate several scenarios for numerical simulation of the proposed breakwater, numerical molding FLOW 3D was used. In this model, two separate grids of different cell sizes were used to achieve a convenient balance between precision/accuracy and time measurement [4]. Low frequency waves have mesh cells that are 1 cm in diameter in each direction, and high frequency waves have mesh cells that are 0.5 cm in diameter for each direction [15].…”

Section: Numerical Moldingmentioning

confidence: 99%

Study Unconventional Alternatives to Vertical Breakwater

H¹,

Mahmoud

2021

Journal of Engineering Research

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The main objective of the breakwaters is to protect the port, the beach or the beach facilities from strong waves and storms, as they help to establish calm inside the port and thus achieve safety for ships, and ease of operation. This research aims to present study unconventional alternatives to vertical breakwater. In this study, two different models of vertical wave barriers implemented were chosen for their study and evaluation of the hydrodynamic performance. The first model is a vertical wall with circular slots and the second model is a vertical wall with square slots. A comparison was made between the two models it was found that the square slots reduce the transmission of waves more than circular slots by 5 to 20%. The use of two circular slotted walls decreases wave transmission by up to 30% and increases wave energy dissipation by up to 40% as compared to a single wall. With increasing relative length (h/L), the horizontal wave force rises. The relative wave forces (F/Fo), at porosity ( ) =0.25, was greater than at porosity ( ) = 0.50 by 10 to 30%. At the openings, the wave velocity is high, and the wave energy dissipation factor was also high; the higher the wave amplitude, the greater the wave energy dissipation factor.

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Numerical solution for the second-order wave interaction with porous structures

Cited by 3 publications

References 19 publications

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Study Unconventional Alternatives to Vertical Breakwater

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