In this study, a two-dimensional numerical wave tank (NWT) was developed by solving the Navier-Stokes equations with the open-source CFD library OpenFOAM. The volume of fluid (VOF) method was adopted for the free surface capture and the k-ω SST model was used for the closure of governing equations. While the velocity profile method and the piston type wavemaker were tested separately for the wave generation, the artificial damping condition, Sommerfeld radiation condition and relaxation zone method were tested respectively to absorb the wave in the simulations of Stokes 2nd waves with different wave steepness ( i =0.01~0.06). According the comparisons between the numerical results and the analytical solutions, the performance of the model settings with different wave generation and absorption methods were analyzed. For the numerical simulations of 2nd order regular waves, the optimal setting is velocity profile method and relaxation zone method for cases with small wave steepness ( i =0.01~0.03), and the piston type wavemaker and the artificial damping condition with squared damping function for cases with large wave steepness ( i =0.04~0.06).