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This paper evaluates the effective depth of waves on the submarine at the depth of water. At the depth called the "Wave Base" which equals to λ/2 the wave effects become so small that motions are negligible. This paper aimed to recommend a minimum safe depth for calm and stable motions of a submarine. This paper concludes the depth of 0.1λ could be recommended as an operational safe and approximately calm depth for submarines. For this study, a torpedo shaped submersible is analyzed in some depths accompanying by regular surface wave. By increasing the depth, the reduction of submarine motions is evaluated. The results of this research can be used for AUVs, research submersibles and naval submarines. This analysis is performed by CFD tools of Flow-3D (V.10) software based on solving the RANS equations and VOF method.

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