Global motions can trigger violent sloshing in tanks, which induce large loads on tank structures. Free-surface RANSE methods are employed for the detailed analysis of such flows. In the presented application also the interaction between free-surface motions of the tank fluids with the ship motions were taken into account. An in-house developed six degrees of freedom (6 DOF) code was used to predict the ship motions.
Slamming induced Loads
Bow and stern slamming cause global and local loads. In the presented application stern slamming pressures were computed and validated with measurements. GL has experience in the numerical prediction of slamming induced pressures since 2001. A lot of validation work has been published over the years.
Whipping of Container Ship
In this application the deformation of a container ship in seaway due to whipping effects caused by slamming forces was predicted and validated with model measurements. The RANSE computations are based on a two-way-coupling, six degrees of freedom (6-DOF)-code, which was developed by GL. The comparison between measurements and calculations show the same value of influence due to whipping effects.
Springing of Ultra Large Container Vessel (ULCV)
Waves may induce resonance vibrations of the hull girder in relatively soft ships, called "springing". These nonlinear effects can be captured in simulations of the fluid-structure interaction. With the two-way coupling RANSE code the deformation of a ULCV in seaway due to springing effects was predicted, see publications.
Ventilation of Open Top Reefer Container Ship
Engine rooms and cargo holds for refrigerated containers require frequently ventilation to remove excess heat. Proper dimensioning of the ventilation during design avoids costly refits once the ship is delivered. RANSE methods allow better assessment of required ventilation fluxes and the comparison of alternative ventilation concepts.
In the presented application the influence of an open top designed container ship on the temperature distribution in a reefer cargo hold was investigated. In a first calculation the temperature, pressure and velocity distribution due to natural, density-driven flow were predicted (ship in harbour, zero speed). In a second step, the ship has a speed of 10 knots and the fair wind cool down the cargo hold.
