DIFFRACTION LOADS ON MULTIPLE VERTICAL CIRCULAR CYLINDERS BY LEAST-SQUARES TREFFTZ-TYPE FINITE ELEMENTS

摘要

The paper deals with the application of the so-called "frameless" Trefftz-type finite elements to the calculation of wave induced loads on the offshore, seabed, cylindrical structures. The method is based on the use of a suitably truncated T-complete set of Trefftz functions over individual subdomains linked by means of a least square procedure. The Neumann homogeneous boundary conditions and the Sommerfeld radiation condition are readily incorporated in the trial functions of special purpose finite elements.