There are many different numerical methods for solving the Navier-Stokes equations for problems with a free surface. Some examples are volume of fluid (VOF), Marker and cell (MAC), level set, smooth particle hydrodynamics (SPH), boundary element methods (BEM) and weighted residual methods. One important element when solving problems with a free surface is how the free surface is treated. One of the most popular techniques is the VOF method. Another approach is to have markers on the free surface and this method is pursued in this study.