Influence of free-surface on wake flow characteristics of a torpedo-like geometry

Kilavuz, A.; Durhasan, Tahir; Özgören, Muammer; Sarigiguzel, F.; Şahi̇n, Beşi̇r; Kavurmacıoğlu, Levent; Akıllı, Hüseyin; Sekeroglu, E.; Yanıktepe, Bülent

doi:10.1007/s00773-022-00893-7

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…Lower angles of attack studies (de Barros et al, 2008;Yagmur, 2016), on the other hand, are often used in combined yawing angles of attacks studies as well as in self-adjusting route of autonomous underwater vehicles (AUVs). Experimental investigations of a torpedo-like geometries for different angles of attack and submersion ratios were performed by Kilavuz et al (2022aKilavuz et al ( , 2022bKilavuz et al ( and 2022c and Sariguzel et al (2022). They emphasized that free-surface has a dominant effect when the submersion ratio is less than a diameter of the geometry and the elliptical noses provide a better performance near the surface.…”

Section: Introductionmentioning

confidence: 99%

POD Analysis of Flow around Torpedo-Like Geometry with a Hemispherical Nose

KENAN,

YANIKTEPE,

OZGOREN

et al. 2023

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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There has been an increased interest in underwater vehicles for a wide range of applications over the past decade. In the current study, flow characteristics around a common, torpedo-like geometry with a Myring profile were investigated at a length-based Reynolds number of Re=20000 using the Particle Image Velocimetry (PIV). As a result of PIV and Proper Orthogonal Decomposition (POD) analyzes in this study; instantaneous streamline topology Ψ, instantaneous vorticity ωL⁄U_∞ contours, instantaneous streamwise velocity component u⁄U_∞ graphs, cross-streamwise velocity component v⁄U_∞ graphs, instantaneous vorticity ωL⁄U_∞ graphs, perpendicular to the flow direction, instantaneous vortex graphs and time-averaged TKE graphs were evaluated and compared. At the same time, as a result of PIV analysis, time-average streamline topology <Ψ> and Time-averaged vorticity <ωL⁄U_∞ > contours values are given. When the flow characteristics were compared by using the obtained POD method of the PIV results, it was determined that although the POD data were generally quite similar to the PIV results, the POD analysis results had a more uniform flow structure and vortex turbulence was lessened.

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Section: Introductionmentioning

confidence: 99%

POD Analysis of Flow around Torpedo-Like Geometry with a Hemispherical Nose

KENAN,

YANIKTEPE,

OZGOREN

et al. 2023

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Comparison of Flow Characteristics of Wake Regions of Single and Lined up in a Row Torpedo-Like Geometries at Uniform Flow Conditions

Akbudak,

Şekeroğlu,

Yanıktepe

et al. 2023

Sustainable Aviation

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A Computational Investigation of the Influence of Seafloor Conditions on the Turbulent Flow Characteristics of an Autonomous Underwater Vehicle

Tabatabaei Malazi,

Tumse,

Ozgoren

et al. 2024

Arab J Sci Eng

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The effect of the seabed on the hydrodynamics of three-dimensional autonomous underwater vehicles (AUVs) varies according to the physical conditions of the place where AUVs interact with the environmental conditions. This study examines the hydrodynamics of an AUV resembling a torpedo model while taking the influence of the seabed surface as a function of the dimensionless distances (G/D) between the torpedo and the seabed. Reynolds numbers, varying from 1 × 104 to 8 × 104, were considered. These Reynolds numbers were associated with various seabed distances falling within 0.25 ≤ G/D ≤ 1.5. To perform the simulations, governing equations were utilized and incorporated with the k–ω SST turbulence model. It has been observed that when AUVs or torpedo models operate in close proximity to the seabed surface, several key hydrodynamic parameters and flow characteristics are affected. These include the pressure coefficient (Cp), drag coefficient (CD), overall flow structures, maneuverability, and performance of the torpedo model. As the AUV or torpedo model approaches the seabed surface, the symmetrical flow pattern deteriorates. This deterioration is associated with changes in vortical flow structures under the influence of seabed surfaces. Additionally, the intensity of the shear stress (τ) near the seabed surface gradually increases as the AUV or torpedo model gets closer to it. In summary, the proximity of AUVs or torpedo models to the seabed surface causes disruptions in the flow patterns, increased shear stress, and alterations in key hydrodynamic parameters, ultimately affecting the system's performance and behavior.

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Influence of free-surface on wake flow characteristics of a torpedo-like geometry

Cited by 5 publications

References 36 publications

POD Analysis of Flow around Torpedo-Like Geometry with a Hemispherical Nose

POD Analysis of Flow around Torpedo-Like Geometry with a Hemispherical Nose

Comparison of Flow Characteristics of Wake Regions of Single and Lined up in a Row Torpedo-Like Geometries at Uniform Flow Conditions

A Computational Investigation of the Influence of Seafloor Conditions on the Turbulent Flow Characteristics of an Autonomous Underwater Vehicle

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