Numerical Simulation of Fixed and Moving Cylinders in Focusing Wave by a Hybrid Method

Based on the open source tool OpenFOAM, a self-developed solver qaleFOAM is applied to generate a focusing wave and simulate the interaction between the focusing wave and fixed/moving cylinder. With qaleFOAM, the focusing wave is generated by the external wave tank based on fully nonlinear potential theory (FNPT) and quasi-arbitrary LagrangianEulerian finite element method (QALE-FEM), and a relaxation zone is used for the wave propagation between the external wave tank and the internal Navier–Stokes domain. In this paper, the generation and propagation of focusing wave is tested first, and the wave elevation at different wave gauges is monitored to show the accuracy of focusing wave generation. Then, a cylinder fixed/moving in the incident focusing wave is simulated by qaleFOAM, the wave elevation near and away from the cylinder is monitored, and the pressure distribution on the cylinder surface is probed. The computed result is compared with the experimental result to validate the numerical method.