This paper presents the hydrodynamic effects of the submarine that moves horizontally, close to the sea bottom. Moving close to sea bottom, induces wall effects on hydrodynamic forces; resistance and lift. A bare hull of a submarine (torpedo shape), without appendages, in horizontal position and different distances from the bottom is considered. For evaluating the problem, variations of resistance and lift versus distance to sea bottom are studied. Pressure distribution on the body, has unique role, which is detailed in this paper. Bottom effects on the pressure resistance and frictional resistance are evaluated separately. According to the results of this paper, bottom effect causes increase in frictional resistance, decrease in pressure resistance, variation in total resistance, increase in negative lift and suction on the hull. Minimum distance for eliminating the changes in the lift forces is suggested equal to 5D, and for resistance is 2D. This analysis is performed by Flow Vision (V.2.3) software based on CFD method and solving the RANS equations.
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