Evaluation of submarine motions under irregular ocean waves by panel method

Abstract

This paper utilizes the Panel method to evaluate the effect of submerged depth in ocean waves on submarine motions. At the depth called the "wave base", the effects become so small that motions are almost negligible. The present research aims at recommending a safe depth for calm and stable motions of a submarine. Depth of λ/2 could be considered as an absolutely calm depth but a depth of 0.1λ is recommended as an operationally safe and approximately calm depth for submarines. To achieve the objectives of the study, a naval submarine was analyzed at some depths accompanied by regular surface wave. By increasing the depth, the reductions in submarine motions are evaluated. The obtained results from the study might have beneficial outcomes for AUVs, and research in submersibles and naval submarines. As mentioned, the analysis is performed by Panel method and the results are compared with those of a CFD method.