Mon July 7th 2008
16:00
HR C101
Seminar Numerical simulation of hydrodynamic wave loading
Arthur Veldman

Details:

Extreme waves and their impact loading on fixed and floating structures,
like production and offloading platforms, coastal protection systems and
offshore wind farms, have long been subjects that could only be studied
with experimental methods. The complex, highly non-linear wave kinematics
could only globally be predicted with existing numerical CFD methods.
However, recent research has shown that new hydrodynamic models based on
the Navier--Stokes equations, in combination with a VOF-based method for
the description of the free-surface dynamics, are making progress in
predicting such effects.

In close cooperation with MARIN (Wageningen), Deltares (Delft) and the
offshore industry the development of these methods is pursued.
Major applications are external flows like green-water loading on the deck
of vessels and wave run-up against platforms, or internal flows like sloshing
inside LNG tanks. Detailed experiments are available to validate the numerical
simulations. During the method development, many numerical features had to be
refined, related for instance to mass conservation and smoothness of the
pressure signals. The current version of the method, called ComFLOW,
contains a two-phase flow description to include the cushioning effects
of entrapped air bubbles. Here the treatment of the density in computational
cells near the free surface appeared to require special care: a so-called
gravity-consistent averaging procedure has been designed.

Although the literature on numerical simulation of free-surface flow is
rapidly expanding, it is our experience that many numerical bits and pieces
still require considerable improvement before the methods can be used
for real-life applications.
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The 10th Complex Motion in Fluids 2021
AQUA
Max Planck Gesellschaft
MCEC
Twente
Centre for Scientific Computing
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