When waves hit coastal structures，fragmentation tends to occur，and the flow pattern of the water changes from laminar to turbulent. The numerical wave flumes have been created based on open source computational fluid dynamic tool OpenFOAM，and laminar flow model and buoyancy modified k-ω SST turbulence model are adopted to simulate wave loads on arc crown walls. The convergence of numerical results is verified by comparing results of pressure at specified positions by three sets of grids. In order to compare the accuracy of the calculation results based on the laminar flow model and the turbulent flow model，the numerical results of the point pressure at the specified position and the total force on the arc crown wall are compared with the corresponding experimental data. The results show that the k-ω SST turbulence model with buoyancy correction can provide more accurate prediction results.