Abstract
Flow state around a square cylinder installed vertically in the wave field and the wave forces on the cylinder have been analyzed by using the point vortex method. The wake vortices due to flow separation from the cylinder corner in the wave field can be presented easily from this analytical method, and the wave forces calculated from this flow states agree roughly well with experimental values. Applying the calculated wave forces to Morison formula, the range of inertia coefficient becomes CM=2.1-1.7 which is similar to the case of a circular cylinder, and that of drag coefficient becomes CD=3-4 which is much larger than in the case of a circular cylinder.
