Schiffe und Offshore-Strukturen in Wellen

Numerical Prediction of Ship and Offshore Structure Responses in Irregular Seaways using CFD-CSD Methods

Andreas Peters, Udo Lantermann, Bettar O. el Moctar

We present computational methods to assess motions and vibrations of ship and offshore structures in irregular waves. The numerical methods solved the Navier-Stokes equations coupled with the nonlinear rigid body motion equations of elastic ship and offshore structures. We numerically investigated different ship types and offshore structures in random irregular long crested waves, and in deterministic wave sequences. Comparisons to experimental measurements agreed favorably. We relied on different wave models, including second order Stokes waves and nonlinear wave fields obtained from the solution of nonlinear Schroedinger equations. Simulations in random irregular waves provided short-term ship and offshore structure response probability distributions under sea state conditions relevant for design loads.