Study On The Hydrodynamic Characteristics Of “π” Shaped Arc-plate Permeable Breakwater Based On OpenFOAM

With the continuous development of the marine industry,port construction is becoming increasingly important.As an important component of the port,the breakwater is the key to port construction.Due to its bottom seated structural characteristics,traditional breakwater hinders the exchange of surrounding water bodies,and is difficult to construct and expensive,gradually unable to meet the needs of port construction and development.Therefore,experts and scholars have designed a plate type permeable embankment with low cost,simple structure,and convenient for the exchange of nearby water bodies,which has received widespread attention and development due to its advantages.In this paper,a "π" shaped arc-plate permeable breakwater structure with double wave baffles added to both wings of a single arc-plate permeable breakwater structure is proposed.The control equation used is the Reynolds time average equation,the wave generation method is the push plate wave generation,and the free surface capture is the VOF method.Based on the Open FOAM software,a numerical model of the interaction between waves and the structure is established.From the perspectives of mesh generation,micro amplitude wave theory The accuracy of the numerical flume is verified by comparing the results of physical model tests.This paper compares the transmission coefficient and reflection coefficient of the "π" shaped arc plate type permeable embankment with that of the single arc plate type permeable embankment,and studies the wave dissipation performance and stress characteristics of the "π" shaped arc plate type permeable embankment by changing the relative arc plate height,relative wave baffle height,and relative submergence depth.The research results show that the wave dissipation performance of the "π" shaped arc plate permeable breakwater is better than that of the single arc plate permeable breakwater.As the relative arc plate height decreases,the relative wave baffle height increases,and the relative submergence depth decreases,the transmission coefficient of the structure gradually decreases,and the reflection coefficient gradually increases.As the relative height of the arc plate increases,the pressure on each measuring point on the upper surface of the arc plate of the structure gradually increases,while the pressure on the lower surface of the arc plate,the front wave baffle,and the back wave surface slightly decreases.With the increase in the relative height of the wave deflector,the pressure on the upper surface of the arc plate changes limited,while the pressure on the lower surface of the arc plate decreases slightly.The range of positive pressure on the front wave deflector surface gradually increases,while the range of negative pressure changes limited.The range of positive pressure on the back wave surface of the front wave deflector gradually decreases,and the range of negative pressure changes limited.As the relative submergence depth increases,the negative pressure on the upper surface of the arc plate generally increases,while the positive pressure rule is not obvious.The pressure on the lower surface of the arc plate slightly decreases,and the pressure on the front and back wave surfaces of the front wave baffle gradually decreases.With the decrease of the relative arc plate height,the horizontal wave force on the structure generally decreases,the range of positive vertical wave force gradually decreases,and the negative vertical wave force has limited variation.As the height of the relative wave baffle increases,the horizontal wave force on the structure gradually increases,and the vertical wave force changes limited.As the relative submergence depth increases,the horizontal wave force on the structure gradually decreases,the positive vertical wave force gradually decreases,and the negative vertical wave force gradually increases.