Abstract
An alternative to experiments is the use of numerical model tests, where the performances of ships can be evaluated entirely by computer simulations. In this paper, the free surface viscous flow around a bare hull model is simulated with three Computational Fluid Dynamics (CFD) software packages (FINE Marine, ANSYS CFD and SHIPFLOW) and compared to the results obtained during the experimental tests. The bare hull model studied is the Duisburg Test Case (DTC), developed at the Institute of Ship Technology, Ocean Engineering and Transport Systems (ISMT) for benchmarking and validation of the numerical methods. Hull geometry and model test results of resistance, conducted in the experimental facility at SVA Postdam, Nietzschmann, in 2010, are publicly available. A comparative analysis of the numerical approach and experimental results is performed, related to the numerical simulation of the free surface viscous flow around a typical container ship. Further, a comparative analysis between the results provided by NUMECA, ANSYS and SHIPFLOW is performed. Regarding the solution obtained, a satisfactory agreement between the towing test results and the computation results can be noticed. The minimum mean error was obtained through the SHIPFLOW case, 2.011%, which proved the best solution for the case studied.
Highlights
In recent decades, freight transport has become important, being one of the most popular methods of transport
The computation was performed on parallel computers with four processors for the NUMECA case and 10 processors for the ANSYS and SHIPFLOW cases
The fact that the computations in SHIPFLOW and ANSYS were made on parallel computers with more processors than the one the NUMECA simulations were conducted on led to this considerable difference in real time
Summary
Freight transport has become important, being one of the most popular methods of transport. Container ships are being replaced by new, faster ships with a much larger capacity due to market demand. The study and improvement of these ships are essential in order to achieve the required performance. Ship resistance is a concept that is constantly being studied due to the changing environment of ship navigation and the tendency to improve ship performance, and to improve the methods for resistance prediction. Testing the ships in towing tanks is the most accurate solution for the prediction of resistance, but it is costly and takes a long time. As technology has developed quite a lot and the computers have a much higher capacity, the determination of the characteristics of ships has been oriented towards numerical simulations [1]
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