79 / 2025-04-24 12:55:45

Numerical Investigation of Asymmetric Wave-induced Scour Around a Vertical Cylinder

asymmetric waves, unstructured grids, scouring, bedload transport.

The scouring dynamics of the seabed due to the presence of a vertical pile is very important for
the design of marine structures. In this work, the focus is the simulation on the case where scour
erosion around a cylinder is uniquely due to the non-linear wave propagation. This non-linear
wave, displaying asymmetric and skewed profiles, is transported by keeping its shape as an
inflow wave train. To this aim, a three-dimensional unstructured finite-volume technique is used
to solve Navier-Stokes equations numerically. The σ-transformation is applied to the vertical
coordinate to fit the computing mesh in describing the evolution of the free surface and mobile
bed. The morphodynamic model includes Exner-Polya and bedload transport equations. Wave
propagation, velocity profile, and dynamic of seabed morphology near the cylinder over an entire
wave phase are present. Comparisons of scour depth and shape between numerical results and
experiments are also carried out.