Abstract
Using vorticity equation and Poisson equation for stream function for governing equation, flow structure around a circular cylinder in water waves was calculated numerically. Calculated results were expressing appropriately the behavior of vorticity, stream line and pressure field. Next, fluid force acting on the circular cylinder was calculated using the values of pressure field obtained by numerical analysis. The coefficients CD, CM of Morison equation were obtained applying the Minimum square method to in-line force with time. Consequently, it was found that when Keulegan-Carpenter number, K. C. became larger, coefficients CD, CM were different gradually compare with these of potential flow.
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