DIFRAKSI GELOMBANG PADA SILINDER 8ESAR DENGAN MILD SLOPE EQUATION

Abstract

ABSTRACT
This research is aimed to know the process of wave diffraction
around the large cylinder of offshore structure using finite element
method. This model chosen because of some reasons, i.e the
complication of offshore structure's shape which are caused difficulties
to conduct physical model solving. The other excess of this numerical
model is cheaper and easier than physical model conducted in the
laboratorium.
The equation of wave diffraction can be formulated as Helmholtz
equation. A second approach can be developed by Mild Slope Equation,
which is assumed that the depth is constant. The Helmholtz equation
was done using finite element method with linear triangle interpolation.
With finite element method, the complicated domain area can be solved
more easily and effectively.
The result shows that the use of finite element method is still
adequate to solve Helmholtz equation' for period 8, 9 and 10 second.
For period of 8 second numerical error produce the wave height
difference of 0,36 m. The numerical model is then easily edited to
analyze another offshore structures.
Keywords: diffraction, cyllinder, finite element