The effect of appendages on the hydrodynamic characteristics of an underwater vehicle near the free surface

Shariati, S. Khalil; Mousavizadegan, S. Hossein

doi:10.1016/j.apor.2017.07.001

Cited by 50 publications

(9 citation statements)

References 10 publications

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“…The authors used Star CCM+ software, developed using a finite volume method. In that study, the major influence of appendage resistance was detected on the viscous part of the total resistance, while wave making resistance was not affected significantly [3].…”

Section: Introductionmentioning

confidence: 70%

“…The IVR is calculated according to Eq. (3) [4]: (3) where -the water inlet velocity, ;the craft velocity, .…”

Section: Inlet Velocity Ratio (Ivr)mentioning

confidence: 99%

“…Thus, the more complex appendages are installed on the floating object, the more important it is to evaluate their resistance. For the CFD study on submarines, Shariati et al showed that the total resistance of a submarine increased by fitting appendages on it [3]. The authors used Star CCM+ software, developed using a finite volume method.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Drag Force Reduction for a Waterjet Propulsion System

Cerpinska

Irbe

Pupurs

et al. 2021

Latvian Journal of Physics and Technical Sciences

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The paper provides simulation results for SUP (Stand Up Paddle) board appendage resistance. Additional propulsion is added to the SUP board. It is equipped with a waterjet. The waterjet is attached to the board rudder. This increases the drag coefficient for rudder five times. To reduce the drag variable, design options for the waterjet duct were proposed. The simulation tests were performed using SolidWorks Flow software using two types of simulations, namely, the pressure on the body and the flow around the body. The objective was to streamline the bluff duct of the waterjet and thus to create the appendage design with minimum drag force from fluid flow and possibly greater Inlet Velocity Ratio. Calculations showed that rounding-off the edges of waterjet duct resulted in 35 % of drag coefficient reduction, while further streamlining reduced it by additional 10 %.

show abstract

Section: Introductionmentioning

confidence: 70%

“…The IVR is calculated according to Eq. (3) [4]: (3) where -the water inlet velocity, ;the craft velocity, .…”

Section: Inlet Velocity Ratio (Ivr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling of Drag Force Reduction for a Waterjet Propulsion System

Cerpinska

Irbe

Pupurs

et al. 2021

Latvian Journal of Physics and Technical Sciences

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“…Querard et al [29] have stated that standard k-ε turbulence model is useful by means of computational time when compared with similar models. Standard k-ε turbulence model has been used in many recent studies such as Liu et al [30], Nematollahi et al [14], Shariati et al [31], Shariati et al [17] and Sezen et al [11].…”

Section: Physics Modellingmentioning

confidence: 99%

Hydrodynamic Investigation of a Submarine Moving Under Free Surface

Doğrul¹

2019

J ETA Maritime Sci

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Submerged bodies are commonly used in many fields such as scientific researches, military and commercial applications. Especially in military applications, submarines have a significant role as a silent and deterrent vehicle. Contrary to popular belief, submerged bodies also operate in shallow depth that free surface effects come into play. This causes the visual identification of submarines while protecting them from sonar detection. This study focuses on the investigation of free surface effects on submarine hydrodynamics moving forward in different depths. The numerical calculations have been conducted at different Reynolds numbers ranging from 1.5x10 7 to 3.5x10 7 for both bare and appended forms of DARPA Suboff. A commercial CFD solver has been used to solve URANS equations with k-ε turbulence model. The numerical approach has first been verified and validated with the available experimental data. Later, the numerical results have been discussed in terms of total resistance, resistance components and free surface deformations. It has been concluded that the submergence depth has a significant role on resistance components for depth Froude number larger than 0.7 and the appendages have little effect on free surface deformations in all depths.

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“…Numerous computational studies on the towed DSub configuration are available in the literature, where usually the Reynolds-averaged Navier-Stokes (RANS) equations are solved due to cost considerations (Gorski, Coleman & Haussling 1990;Givler et al 1991;Boger & Dreyer 2006;Toxopeus 2008;Pan, Zhang & Zhou 2012;Budak & Beji 2016;Cao, Zhu & Zeng 2016;Manshadi, Hejranfar & Farajollahi 2017;Gao et al 2018;Wang et al 2018;Zhang, Chao & Pan 2019), with some works dealing also with the free-surface effects (Shariati & Mousavizadegan 2017;Amiri et al 2018). More recently, hybrid formulations such as the detached eddy simulation (DES) approach are gradually replacing RANS in the design cycle.…”

Section: Introductionmentioning

confidence: 99%