Tarbiat Modares University Modares Civil Engineering Journal 2476-6763 20 3 2020 10 22 Numerical Modeling of Pressure on Composite Berm Breakwater and its Comparison with Horizontally Caisson Breakwater Considering the Effect of Porous Medium Numerical Modeling of Pressure on Composite Berm Breakwater and its Comparison with Horizontally Caisson Breakwater Considering the Effect of Porous Medium 79 92 12352 FA Morteza Marashian Water and Environmental Engineering Department, Faculty of Civil Engineering, Shahrood University of Technology Mahdi Adjami Water and Environmental Engineering Department, Faculty of Civil Engineering, Shahrood University of Technology Ahmad Rezaee Mazyak Faculty of Civil and Environmental Engineering, TMU Journal Article The pressure distribution resulting from the wave interaction in the horizontally caisson breakwater is one of the important parameters in the design of this breakwater. Due to the significant impact of this parameter, the use of composite berm breakwater has been investigated to improve the performance and reduce the forces applied to the structure .In this study, numerical modeling of pressure on composite berm breakwater and its comparison with horizontally caisson breakwater has been investigated by numerical model of FLOW-3D. In composite berm breakwater, compared with the horizontally caisson breakwater at P1 (the maximum pressure applied to the caisson at the surface of the water), the amount of achieved pressure showed the reduction of 52.09% and at P2 (maximum pressure in the caisson crest), the achieved pressure showed 63/07 % decrease. Also in P3 (maximum pressure in caisson toe), the pressure was reduced by 76.09%, and in Pu (uplift pressure under caisson), this value indicates a decrease of 53.92%.<span dir="RTL"></span> The pressure distribution resulting from the wave interaction in the horizontally caisson breakwater is one of the important parameters in the design of this breakwater. Due to the significant impact of this parameter, the use of composite berm breakwater has been investigated to improve the performance and reduce the forces applied to the structure .In this study, numerical modeling of pressure on composite berm breakwater and its comparison with horizontally caisson breakwater has been investigated by numerical model of FLOW-3D. In composite berm breakwater, compared with the horizontally caisson breakwater at P1 (the maximum pressure applied to the caisson at the surface of the water), the amount of achieved pressure showed the reduction of 52.09% and at P2 (maximum pressure in the caisson crest), the achieved pressure showed 63/07 % decrease. Also in P3 (maximum pressure in caisson toe), the pressure was reduced by 76.09%, and in Pu (uplift pressure under caisson), this value indicates a decrease of 53.92%.<span dir="RTL"></span> https://mcej.modares.ac.ir/article_12352_49b44fc23736ae85aededcc798f22c4a.pdf