Non-linear free surface induced pressure on a submerged horizontal circular cylinder at low Keulegan-Carpenters numbers

The interaction of regular waves with a horizontal circular cylinder at low KC Keulegan-Carpenter numbers is studied on an experimental basis. The mai n aim of the present study is to evidence the effects of the submergence of the cylinder on the higher-order frequency components of the pressure at t he cylinder surface. It is shown that the bulk of the second and third harm onic term in the pressure is found on the lee side of the cylinder with pea k values up to 25 and 15% respectively of the undisturbed pressure at the a xis for the shallower cylinder condition tested. In the same case the highe r-order terms of both the pressure and the free surface elevation exhibit s aturation with increasing KC. (C) 2001 Elsevier Science Ltd. All rights res erved.