The Reynolds-averaged Navier-Stokes equations are used to solve the mean flow of incompressible viscous fluid.The k-ε turbulence model is introduced to simulate the turbulence motion, and the volume of fluid(VOF)is utilized to track the free surface.A two-dimensional numerical wave flume is built to simulate and investigate the wave dissipation performance of partially perforated caisson with double-chamber on a rubble-mound foundation.The numerical results are compared with the reflection coefficient of perforated caisson with single-chamber on a rubble-mound foundation of the completed experimental results, and the comparisons are in good agreement.According to the numerical calculation results, the reflection coefficient and the flow field near the partially perforated caisson with double-chamber on a rubble-mound foundation are analyzed.The results show that the reflection coefficient Kr?has a nonlinear relationship with the total relative wave chamber width B/L, and gets the minimum value at B/L=0.15.The influence of the rubble-mound foundation height on the reflection coefficient is associated with the width of each wave chamber and the wave period.The reflection coefficient has a smaller value when the widths of the front and back chamber are equal(B1=B2).The flows inside the front wave chamber are more violent, and vorticity and turbulence are mainly concentrated on both sides of each perforated wall, as well as at the free water surface outside and in front of the wave chamber.