March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
In recent years, the Office of Naval Research of the United State Navy has initiated a specific task aiming to accurately predict dynamic ship response and impact loads through two-phase computational fluid dynamic (CFD) simulations for use in improving semi-planing ship design. As with proper CFD practices, validation must be shown before the computed pressure and impact loads can be used in the structural analysis of the ship. This task demonstrates how a CFD tool was validated and used for predicting wave impact load to improve the design of our future ships by making them safer while engaged in critical missions.
In the current study, the Athena, a standard test model which has been used to generate benchmark test cases for CFD validation in the last two decades, has been retested to provide better data for CFD validation. STAR-CCM+® and one other flow solver have been used to compare with the new test data for calm water and regular waves. A series of benchmark cases were performed to validate pitch, heave, resistance and vertical acceleration. In addition to the regular waves, the CFD validation for the irregular wave data is underway.
In order to reconstruct the irregular wave field in STAR-CCM+, a 6-DOF potential flow solver, LAMP, has been used to generate a wave field which is close to the wave field generated by the tow tank wave maker. A similar method was used to generate the full scale wave field for the scenario of possible maximum wave impact load. Several groups of regular waves with different headings were generated and superimposed to form an irregular wave field. The predicted ship motion data, the pressure at the sensors and the wave impact loads are provided for validation and further structural analysis.