Spatial Realizations of Ship Radiation and Diffraction Waves in Random Ambient Sea Waves

摘要

This report presents the calculation procedure and numerical examples for the far field radiation and diffraction waves due to a ship in the presence of a random sea. The procedure essentially consists of extending a previously derived method for the ship waves due to a single exciting wave to the multi-wave random sea. Wave patterns are calculated for four ship hulls, including the case of a twin hull, in the presence of Sea States 2, 4, and 8. The results are presented in the form of three dimensional, two dimensional, and contour plots of the ship, sea, and superposed wave patterns. In a Sea State 4, the three smaller hulls make only a relatively small change to the ambient wave pattern while the CVA59 aircraft carrier makes a large change. Keywords: Far field waves; Radiation and diffraction; Random ambient sea waves; Spatial realizations.