Numerical Simulation of the uplift force of semi-submerged platforms

A vertical two-dimensional numerical wave model is developed based on 2-D unsteady incompressible Reynolds Equation, in which the standard k-epsilon equation is used to close the Reynolds equations and VOF Youngs method is used to reconstruct the free surface. And the Dynamic Mesh Model was introduced to generate waves: smooth waves can be obtained by setting the computing area change with one boundary moving to and fro in appropriate frequency and amplitude. Finally, the validated model was used to simulate the uplift forces of the offshore platform. The relation between positions of platform and characters of wave is demonstrated and analyzed, and a tentative rule governing the uplift forces was given. It can be found that the uplift forces of platforms have linear rules with the ratio of the platform length to the wave length when they are under the water.