جستجوی مقالات مرتبط با کلیدواژه « ضریب انتقال موج » در نشریات گروه « مهندسی دریا »

Predicting the effect of waves on breakwaters is very important for port design. One of the types of breakwaters that can be installed, moved and reused in different conditions, even in deep waters, is floating breakwaters. But their complex reaction in response to the passing of the wave makes their use suitable for a certain periodicity range. One of the most important and influential issues in the efficiency of a floating breakwater is its geometric shape. In this research, numerical investigation of the effect of floating breakwater section geometry in single and double rows on the wave transmission coefficient in ANSYS-AQWA software for wave periods between 3 and 10 seconds has been investigated. For validation, the results of the present numerical model were compared with the experimental results, which are in good agreement. In the used models, the immersion depth is assumed constant and the proposed geometric sections with different masses and densities were investigated. Based on the results obtained with in the mentioned periods, a geometry with the best efficiency and lower cost has been proposed for related projects.

In the field of port design or protection of marine structures, one of the important things is predicting the performance of breakwaters against radiation waves. A type of breakwater that today, in addition to being able to be quickly installed, moved and reused in areas with similar conditions, maintains the water connection between protected space and open waters, is a floating breakwater. One of the factors influencing the performance of floating breakwaters is the geometrical parameters of the floating breakwater section. In this research, the numerical investigation of the effect of geometrical parameters of rectangular floating breakwater in single-row and double-row state on its hydrodynamic performance and wave transmission coefficient in ANSYS-AQWA software for wave periods in the range of 3 to 7 seconds has been investigated. For verification, the results of the present numerical model were compared with the laboratory results of Ji Deng et al. in (2019), which is in good agreement. The results showed that the use of a rectangular floating breakwater with the ratio of the height of the structure to the width of the structure in the range of 0.35 to 0.45 has the best performance. Also, increasing the mass of the structure against short-period waves improves performance and reduces the forces on the restraining cable and while in the face of long-period waves, reducing the mass of the structure improves the performance of the rectangular floating breakwater.

Floating breakwaters are good alternative to the so-called fixed base breakwaters, which, in addition to having the main purpose of protecting the beach from waves, also maintain the water connection between the sea and the protected area. Researchers in order to increase the efficiency and increase the performance range of floating breakwaters, have done many researches on their effective parameters. In this research, due to improve the performance of the rectangular floating breakwater, the effect of using straight transverse ducts with a rectangular cross-section and transverse ducts with a geometric design modeled after the Tesla valve on the performance of the floating breakwater using ANSYSAQWA software was investigated. In this modeling, floating breakwaters with a height of 4 meters and an immersion depth of 2 meters were analyzed under the influence of waves with a height of 1 meter and in the range of wave periods (3-8) seconds. The results showed that compared to the rectangular floating breakwater model in the period (3-8) seconds, Using a straight channel in the body of a rectangular floating breakwater up to an average value of 20.9% and using a duct with a geometric design modeled on the Tesla valve in the body of a rectangular floating breakwater improves the performance of the structure up to an average of 20.3%.