There are many ways in which ship operations can be optimised. One of them is by optimising the trim of the vessel to achieve minimum fuel consumption. However, getting accurate data needed for trim optimisation is not easy, while being essential to the success of trim optimisation.
The main purpose of the method used to acquire trim optimisation data, is to relate propulsion power to draft, speed and static trim of the vessel. The differences between individual trims can be small from the hydrodynamic point of view, which is why a precise method is necessary to produce reliable data. Model tests present the most reliable way of acquiring trim optimisation data, while CFD offers similar accuracy, for a fraction of the cost.
Trim optimisation data is acquired by performing self-propulsion simulations at different sailing conditions. The sailing conditions are selected based on the operational profile of the vessel, in order to minimize the cost of the study. The sets of sailing conditions are further refined during the study itself, as the calculated data sheds light on powering trends, showing where to focus more in order to achieve higher savings.