Post doc Renato Skejic is working with development of medium-fidelity computational methods for added resistance due to waves. This means potential flow methods that are less complicated, faster and more robust than full 3-D non-linear panel methods while still being more accurate than the current linear potential flow methods implemented in ShipX and applied in Gymir. The methods he is aiming at will be computationally fast, but will require input of 3-D hull geometry. The deliverables are expected to be in terms of scientific paper(s) and computer implementation(s) of the method(s). Final implementation and integration with (for instance) ShipX and Gymir will be outside the scope of the post doc project.
The ships behavior and their operational patterns in a seaway are strongly affected by the presence of the added resistance in a seaway. Therefore, in order to ensure the optimized and economically justified short, medium and/or long time duration voyages of the ship in the realistic irregular wave field scenarios, the added resistance needs to be investigated from both, the theoretical and/or experimental point of view.
Present work, related to the investigation of the added resistance in waves, accounts for the several, so called, medium-fidelity theoretical methods, which are capable for the prediction of the mentioned quantity. The methods, having the medium level of complexity and being satisfactory robust and fast, are based on the pragmatic theoretical derivations. They, in the same time, are satisfying requirement concerning the accuracy within common engineering practice. This in turn makes the medium-fidelity methods one of the best candidates for the simulator environment when the investigation of the ship optimized operational profile in a seaway is required.
The developed medium-fidelity methods for the prediction of the added resistance in waves are employed on the several distinctive ship hull forms with the significantly different block coefficients. This is done in order to exemplify capabilities of the developed methods in respect to the investigated ship hull forms and their corresponding experimental data. Finally, the applicability of the medium-fidelity methods is discussed based on the requirements imposed by the parties involved in investigation of the optimized ships operational profiles in a seaway.
Predictionof Added Resistance in Waves - report SM2017 F-007 (Skejic & Alterskjær,2017)