Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Abstract

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.

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

“…The hydrodynamic boundary conditions, no slip and in the direction of the unit vector normal, are presently at the boundaries of the object hydrodynamically analysed in the imposed fl uid fl ow fi eld (viscosity and vortices are present; therefore the RANS equation system is applied and solved). The validity of the above-mentioned numerical models in predicting breakwater effi ciency is also verifi ed by comparing their results with the present experimental results along with other experimental and theoretical results obtained from other studies [26,27,28]. The comparison was made to the present experimental results under the same conditions as the wave case in terms of its frequency and time to reach the end of the channel, which was 12 seconds, and this case was for an emerging wave without a breakwater.…”