Numerical simulation of wave interacting with a submerged cylinder using a 2D RANS model

• Accuracy of a 2D RANS model IH2VOF to simulated forces on a submerged cylinder is verified.
• The same trend of fundamental quantities with the gap between the cylinder and the bottom was obtained.
• Lift forces and streamlines show good agreement compared with the experimental results.
• The Morison method shows the better agreement to estimate the drag and inertia coefficients.

A 2D RANS numerical model (IH2VOF) is employed to study wave interacting with a circular cylinder with a diameter of 0.02 m in a water depth of 0.27 m, with a wave period of 1.08 s and a wave height of 0.047 m. The influence of the wall proximity on the forces is analyzed for ratios between the pipe (i.e. circular cylinder) distance from the bottom and the pipe diameter varying from 0.04 to 1.5. Results of lift forces and streamlines are compared with the experimental results of Jarno-Druaux et al. (1995) and good agreement is found. Lift, drag and inertia coefficients are also compared with experimental results and the same trend of fundamental quantities with the gap between the cylinder and the bottom was obtained with the model giving slightly larger values. Finally, the influence of the method to estimate the drag and inertia coefficients in the force calculated using Morison equation is analyzed and Morison method shows the better agreement.