Investigations on experimental and computational trim optimisation methods

Trim and Engine Power Joint Optimization of a Ship Based on Minimum Energy Consumption over a Whole Voyage

“…In this paper, the ship resistance, based on which the relationship of speed vs. draft and trim surface is created, is obtained by CFD numerical simulations under different combinations of draft, trim, and speed. As CFD is low in accuracy if the hydrodynamic model or parameters are not properly set [22], model tests or full-scale measurements of real ships could be used instead of CFD simulations to gain more accurate resistance results for the proposed optimization methods. The hull resistance is the input data only for the proposed methods, and can be obtained using various methods.…”

“…Xie et al [21] developed a speed and trim joint optimization method by using sensor data and a fuel consumption prediction model to minimize the fuel consumption, and proved that joint optimization can overcome the limitations of single-factor optimization such as trim optimization and speed optimization by considering multiple factors simultaneously. Korkmaz et al [22] investigated the trim trends by using Experimental Fluid Dynamics (EFD) compared to CFD with the example of a RoPax vessel, and came to some valuable conclusions on the comparison of the accuracy of EFD and CFD, and some suggestions were given on how to improve the precision of trim trends prediction.…”

“…As stated above, the existing literature primarily focuses on the methods to obtain optimal trim, such as CFD numerical stimulation [16,[18][19][20][21], model tests [22], and analysis of real ship measured data [12][13][14][15]17], etc. The relevant research was mostly aimed at finding the optimal trim which corresponds to the minimum energy consumption at a given draft and speed, or at performing trim and speed joint optimization with a fixed draft.…”

“…6:Calculate the travel time T i according to tr 0i and d 1i with Equation(22). Add point (P Bi , tr 0i ) into point set P TR A, and add point (P Bi , T i ) into point set P T A. T A, and create a spline with point set P TR A denoted by SP PB-tr .…”