Numerical investigation on the wave force characteristics of multi-cylinder with equilateral-triangular arrangement

A numerical investigation of two-dimensional unsteady, viscous and laminar compressible flow past an asymmetric biconvex circular-arc aerofoil in supersonic regime is carried out. The focus of the present work is to investigate the effects of variation of Mach number, at two different angles of attack, on the flow and force characteristics on NACA 2S-(50)(04)-(50)(20) aerofoil. The value of Reynolds number is taken as 5x105. The computations are carried out at Mach numbers of 1.25, 1.5 and 2.0 at an angle of attack of α=0° and α=10°. It is found that the aerofoil works well in the supersonic flow and, unlike the conventional symmetric biconvex aerofoil, generates finite lift at α=0° due to stronger shock waves at the lower surface. Moreover, the L/D ratio at α=10° is always found to be more than 2.5.

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WAVE FORCE CHARACTERISTICS ON THE WAVE ABSORBING CAISSON WITH ANGULAR MEMBERS IN IT'S FRONT

Journal of Japan Society of Civil Engineers Ser B3 (Ocean Engineering) ◽

10.2208/jscejoe.67.i_76 ◽

2011 ◽

Vol 67 (2) ◽

pp. I_76-I_81

Author(s):

Hiroyuki KAWAMURA ◽

Koichiro OGURA ◽

Junichiro ASADA ◽

Kaiin MEIYO

Keyword(s):

Wave Force ◽

Force Characteristics

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Interaction Effect between Caissons by Installation of New Caisson on Existing Caisson Breakwater in Second Order Stokes Wave Condition

Journal of Korean Society of Coastal and Ocean Engineers ◽

10.9765/kscoe.2021.33.6.345 ◽

2021 ◽

Vol 33 (6) ◽

pp. 345-356

Author(s):

Min Su Park

Keyword(s):

Wave Structure ◽

Time Domain Analysis ◽

Wave Force ◽

Stokes Wave ◽

Wave Forces ◽

Wave Condition ◽

Unusual Distribution ◽

Caisson Breakwater ◽

The Individual ◽

Force Characteristics

In order to increase the structural stability of existing caisson breakwater, the design and the construction is carried out by installation of new caissons on the back or the front of old caissons. In this study, we use the ANSYS AQWA program to analyze the wave forces acting on individual caisson according to effects of wave structure interaction when new caissons are additionally installed on existing caisson breakwater. Firstly, the wave force characteristics acting on the individual caisson were analyzed for each period (frequency) in the frequency domain. In time domain analysis, the dynamic wave force characteristics were strongly influenced by the distance between caissons on the frequency at which the unusual distribution of wave forces occurs.

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Numerical investigation of the wave force on a partially immersed rectangular structure: Long waves over a flat bottom

Ocean Engineering ◽

10.1016/j.oceaneng.2020.108540 ◽

2021 ◽

Vol 221 ◽

pp. 108540

Author(s):

Oleg I. Gusev ◽

Gayaz S. Khakimzyanov ◽

Leonid B. Chubarov

Keyword(s):

Numerical Investigation ◽

Wave Force ◽

Long Waves ◽

Flat Bottom

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Wave Force Characteristics and Stability of Detached Breakwaters Consisting of Open Cell Caissons Interlocked via Crushed Stones

Water ◽

10.3390/w12102873 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2873

Author(s):

Byeong Wook Lee ◽

Jae-Sang Jung ◽

Woo-Sun Park ◽

Jae-Seon Yoon

Keyword(s):

Structural Stability ◽

Analytical Solutions ◽

Incident Angle ◽

Frictional Resistance ◽

Wave Theory ◽

Wave Force ◽

Linear Wave ◽

Open Cell ◽

Wave Basin ◽

Force Characteristics

The maximum external force acting on a long continuous harbor structure can be reduced by controlling the phase difference of forces acting longitudinally. This strategy can be used to increase the structural stability of breakwaters consisting of caissons. Breakwaters have been developed using interlocking caissons to effectively respond to the constant increase in wave height due to climate change. In this study, we investigated the wave force characteristics and stability of a detached breakwater consisting of open cell caissons interlocked via crushed stones. We performed wave basin experiments and compared the results with analytical solutions of linear diffraction waves. The results revealed that the maximum wave force acting on the front of the breakwater decreased as the incident angle increased, reducing by as much as 79% for an incident angle of 30°. Although the variability of the maximum wave force for each caisson is large owing to the influence of the diffracted waves, the maximum wave force acting on the entire detached breakwater was not significantly affected by this variability. The analytical solutions based on linear wave theory agreed with the experimental results, indicating that the findings can be applied to actual designs. The structural stability of the breakwater was enhanced, even for low incident wave angles, compared to that of a single integral structure, as the frictional resistance produced by the sliding structure increased due to the shear resistance between the filled crushed stones and the rubble mound.

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