Computational fluid dynamics analysis on the added resistance of submarine due to Deck wetness at surface condition

Abstract

This article describes the evaluation of the wave profile of submarine at surface condition and deck flooding which occurred by the wave making pattern at the bow. Movement of ships and submarines on the free surface of calm water creates the surface wave. Because of the difference in the bow shape and freeboard height, the wave making system in ships and submarines is different. Rounded or elliptical bow shape of submarines generates a high bow wave which causes deck and bow wetness. This is because of the fact that in submarines, this situation arises a small freeboard. In submarines, Deck wetness (because of deck flooding) is a very important subject that has some remarkable consequences, such as increase in resistance and added weigh. The focus of this article is on the added frictional resistance in the deck wetness condition. The bow wave profile, deck wetness and added resistance are studied in several Froude numbers by computational fluid dynamics method. This analysis is performed for a bare hull model at two different drafts by Flow Vision (V.2.3) software based on computational fluid dynamics method and solving the Reynolds-averaged Navier-Stokes equations.

Numerical Investigate the Effect of Turbulence Models on the CFD Computation of Submarine Resistance

“…Reynolds Stress Diffusion D is provided below: (13) Where: µ is the dynamic viscosity, k  is a model coefficient…”

“…One of the primary objectives for designers and researchers is to accurately predict the resistance of submarines at various velocities. For this purpose, in recent days, researchers worldwide have extensively employed Computational Fluid Dynamics (CFD) for evaluating the ship hydrodynamics characteristics [1][2][3][4][5][6][7][8][9][10] and particularly on the submarine hydrodynamics [11][12][13] due to this method offers relatively reliable results compared to experimental method [6,14]. Furthermore, it provides the added advantage of saving time and costs, and the CFD can visualize flow detail around the ship submarine, which serves for the optimization of submarine hull form.…”

“…These researchers have identified effective turbulence models for accurately estimating the resistance of the ship and have provided insightful conclusions for the selection of an appropriate turbulence model for surface ships. Concerning the submarine resistance prediction, there have been carried out by several authors [11][12][13][19][20][21][22]. Tu T.N et al, [11] applied the RANSE method with five different turbulence models to predict submarine resistance at different velocities.…”

“…The results of this study showed that the SST k-ω turbulence model was in best agreement with the measured data. Mohammad Moonesun et al, [13] used CFD method with k-ɛ turbulence model to investigate the effect of ratio of length to diameter on submarine resistance for minimizing the resistance. Dogancan Uzun et al, [19] conducted a study influence of biofouling on submarine resistance in full-scale by using CFD method with SST k-ω turbulence model.…”

Hydrodynamic Force of Resistance of Tourist Underwater Vehicle’s Bare Hull with Diff erent Heads using OpenFOAM

“…A submarine operation in diff erent environments such as submerged and free surface conditions (including calm and wave conditions) has been investigated. The added force of resistance of submarines due to deck wetness at surface conditions was studied by Moonesun et al [20]. They determined deck fl ooding of submarines caused by the wave making pattern at the bow.…”