Experimental investigation of hydrodynamic characteristics of a submersible vehicle model with a non-axisymmetric nose in pitch maneuver

Snoussi, Ali; Dehghan, Ali Akbar; Manshadi, Mojtaba Dehghan

doi:10.1016/j.oceaneng.2015.03.010

Cited by 35 publications

(16 citation statements)

References 20 publications

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“…Jagadees et al 2009 [3] observed using experimental analysis that the hydrodynamic force coefficients are very sensitive to the depth of immersion and the speed of the AUV. Saeidinezhad et al 2015 [4], carried out an experimental analysis of the effect of the Reynolds number on the pitch and on the drag coefficient of a submersible vehicle model. Javadi et al 2015 [5] performed an experimental investigation of the effect of bow profiles on the resistance of the AUV in a towing tank at different Froude numbers and studied the variability of the friction drag as a function of the Froude number.…”

Section: Introductionmentioning

confidence: 99%

Layout Effect of Two Autonomous Underwater Vehicles on the Hydrodynamics Performances

Helmaoui

Saidi

Laidoudi

et al. 2020

Wseas Transactions on Systems

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Three-dimensional computational fluid dynamics (CFD) is used for the design optimization of the layout of an autonomous underwater vehicles (AUV) containing three torpedo-shaped hulls. The AUV layout is defined by two parameters a and b present the stance following YY and XX respectively. several simulations are carried on the AUV with different positions of the torpedo in order to define the optimal layout which designates the minimum drag. the numerical results approve that the variation in the drag coefficient of the AUV is the to the interaction of the flow rate and the pressure change between the both hulls. in addition, an optimal layout for the minimum AUV drag with two torpedoes is found which provides a drag reduce of about 11.4% lower than a single UV with a single torpedo.

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Section: Introductionmentioning

confidence: 99%

Layout Effect of Two Autonomous Underwater Vehicles on the Hydrodynamics Performances

Helmaoui

Saidi

Laidoudi

et al. 2020

Wseas Transactions on Systems

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“…Investigation of the hydrodynamic performance of AUV has substantial significance in the design of AUV. Several experimental and numerical studies are available in the literature in which the evolution of hydrodynamic coefficients over AUV hulls were studied to better understand the hydrodynamic forces and moments acting on the AUV under various conditions [2,3,4,5,6,7,8,9,10,11,12]. Jagadees et al [2] made experimental analysis of hydrodynamic force coefficients at different angle of attacks and Reynolds numbers over the standard hull form.…”

Section: Introductionmentioning

confidence: 99%

“…Jagadees et al [2] made experimental analysis of hydrodynamic force coefficients at different angle of attacks and Reynolds numbers over the standard hull form. Saeidinezhad et al [3] analyzed the effect of Reynolds numbers on the pitch and drag coefficient of a submersible vehicle model. Javadi et al [4] conducted experimental analysis of the effect of bow profiles on the resistance of the AUV in a towing tank at different Froude numbers and have studied the variability of the friction drag with Froude numbers.…”

Section: Introductionmentioning

confidence: 99%

The effects of free stream turbulence on the hydrodynamic characteristics of an AUV hull form

2019

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This article presents experimental and numerical studies on the effect of free stream turbulence on evolution of flow over an autonomous underwater vehicle (AUV) hull form at three Reynolds numbers with different submergence depths and angles of attack. The experiments were conducted in a recirculating water tank and the instantaneous velocity profiles were recorded along the AUV using Acoustic Doppler Velocimetry (ADV). The experimental results of stream-wise mean velocity, turbulent kinetic energy(TKE) and Reynolds stresses were used to validate the predictive capability of a Reynolds stress model (RSM) with the wall reflection term of the pressure strain correlation. From the high fidelity RSM based simulations it is observed that in presence of free stream turbulence, the pressure, skin friction, drag and lift coefficients decrease on the AUV hull.The variation of the hydrodynamic coefficients were also plotted along the AUV hull for different values of submergence depth and angle of attack with different levels of free stream turbulence. The conclusions from this experimental and numerical investigation give guidance for improved design paradigms for the design of AUVs.

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“…This requires that the AUV design be as optimal as possible, necessitating a careful analysis of the hydrodynamic performance of the AUV structure. Several experimental and numerical studies are available in the literature to analyze the hydrodynamic parameters around AUVs [3,4,5,6,7,8,9,10,11,12,13,14,15].Mansoorzadeh and Javanmard [3] have studied the effect of free surface on drag and lift coefficients of AUV at different submergence depths and compared the experimental data with the computational fluid dynamics (CFD) simulations. It was observed that hydrodynamic coefficients were very much responsive to the submergence depth and AUV speed.…”

mentioning

confidence: 99%

“…numbers. Saeidinezhad et al [5] performed experimental analysis of the effect of Reynolds numbers on the pitch and drag coefficient of a submersible vehicle model. Javadi et al [6] conducted experimental analysis of the effect of bow profiles on the resistance of the AUV in a towing tank at different Froude numbers and have studied the variability of the friction drag with Froude numbers .…”

mentioning

confidence: 99%

Experimental and numerical investigation of the hydrodynamic characteristics of Autonomous Underwater Vehicles over sea-beds with complex topography

2020

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Improved designs for Autonomous Underwater Vehicles (AUV) are becoming increasingly important due to their utility in academic and industrial applications. However, a majority of such testing and design is carried out under conditions that may not reflect the operating environment of shallow water AUVs. This may lead to imprecise estimations of the AUV's performance and sub-optimal designs. This article presents experimental and numerical studies carried out in conjunction, to investigate the hydrodynamic characteristics of AUV hulls at different Reynolds numbers over sloped channel-beds. We carry out experiments to measure the velocity field and turbulent statistics around the AUV with quantified uncertainty. These are contrasted against corresponding flat bed experiments to gauge the effect of test bed topography on AUV performance.The experimental data was used to validate Reynolds Stress Model predictions. Hydrodynamic parameters such as drag, pressure and skin friction coefficients were predicted from the RSM simulations at different test bed slopes, angles of attack and drift angles of the AUV hull, to analyze the hydrodynamic performance of the AUV. The results presented in this article offer avenues for design improvement of AUVs operating in shallow environments, such as the continental slope and estuaries.The exploration of ocean and to interpret its underwater behavior is of importance in todays world. To examine the ocean bed, convenient accessories are required to minimize the presence of human operators underneath of ocean. Autonomous Underwater Vehicles (AUV) are automated vehicles that are capable of underwater locomotion. These have applications in a variety of fields. For example, in the commercial field, oil and sub-sea drilling companies use AUVs for the purpose of checking the appropriate oceanic area where drilling may be optimally beneficial. For research and exploration, AUVs are used to track reefs and other life-forms that exist underwater. Additionally, AUVs have found applications in military and academic fields as well, besides others[1].The initial AUV designs were just modifications on existing designs of submersible torpedoes [2]. However, with the new found applications of these vehicles, focused investigation into their optimal design have become more critical. For instance, there is a demand for AUVs that can execute missions of the order of weeks and months. This requires that the AUV design be as optimal as possible, necessitating a careful analysis of the hydrodynamic performance of the AUV structure. Several experimental and numerical studies are available in the literature to analyze the hydrodynamic parameters around AUVs [3,4,5,6,7,8,9,10,11,12,13,14,15].Mansoorzadeh and Javanmard [3] have studied the effect of free surface on drag and lift coefficients of AUV at different submergence depths and compared the experimental data with the computational fluid dynamics (CFD) simulations. It was observed that hydrodynamic coefficients were very much responsive to the submergence...

show abstract

Experimental investigation of hydrodynamic characteristics of a submersible vehicle model with a non-axisymmetric nose in pitch maneuver

Cited by 35 publications

References 20 publications

Layout Effect of Two Autonomous Underwater Vehicles on the Hydrodynamics Performances

Layout Effect of Two Autonomous Underwater Vehicles on the Hydrodynamics Performances

The effects of free stream turbulence on the hydrodynamic characteristics of an AUV hull form

Experimental and numerical investigation of the hydrodynamic characteristics of Autonomous Underwater Vehicles over sea-beds with complex topography

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