Resistance reduction optimization of an amphibious transport vehicle

Liu, Bolong; Xu, Xiaojun; Pan, Dibo

doi:10.1016/j.oceaneng.2023.114854

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…In this paper, the RANS equation is used as its basic control framework to simulate the unsteady flow process using an implicit solution method. The CFD methodologies, anchored in the RANS equations, are effectively established to address fluid dynamics challenges in engineering, as supported by [21]. The RANS equations can depict the evolution of averaged flow field variables in turbulent motion, achieved through time-averaging the unsteady flow governing equations and primarily focusing on large-scale, time-averaged flow phenomena.…”

Section: Governing Equationmentioning

confidence: 99%

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Wang,

Gu,

Lang

et al. 2024

JMSE

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This study verifies the effects of deployment parameters on the safe separation of Autonomous Underwater Vehicles (AUVs) and mission payloads. The initial separation phase is meticulously modeled based on computational fluid dynamics (CFD) simulations employing the cubic constitutive Shear Stress Transport (SST) k-ω turbulence model and overset grid technologies. This phase is characterized by a 6-degree-of-freedom (6-DOF) framework incorporating Dynamic Fluid-Body Interaction (DFBI), supported by empirical validation. The SST k-ω turbulence model demonstrates superior performance in managing flows characterized by adverse pressure gradients and separation. DFBI entails computationally modeling fluid–solid interactions during motion or deformation. The utilization of overset grids presents several advantages, including enhanced computational efficiency by concentrating computational resources solely on regions of interest, simplified handling of intricate geometries and moving bodies, and adaptability in adjusting grids to accommodate changing simulation conditions. This research analyzes mission payloads’ trajectories and attitude adjustments after release from AUVs under various cruising speeds and initial release dynamics, such as descent and angular velocities. Additionally, this study evaluates the effects of varying ocean currents at different depths on separation safety. Results indicate that the interaction between AUVs and mission payloads during separation increases under higher navigational speeds, reducing the separation speed and degrading the stability. As the initial drop velocities increase, fast transition through the AUV’s immediate flow field promotes separation. The core of this process is the initial pitch angle management upon deployment. Optimizing initial pitching angular velocity prolongs the time for mission payloads to reach their maximum pitch angle, thus decreasing horizontal displacement and improving separation safety. Deploying AUVs at greater depths alleviates the influence of ocean currents, thereby reducing disturbances during payload separation.

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Section: Governing Equationmentioning

confidence: 99%

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Wang,

Gu,

Lang

et al. 2024

JMSE

View full text Add to dashboard Cite

show abstract

“…Sun et al [4] and Pan et al [5] conducted studies using experiments and simulations to improve resistance performance by adding flaps as attachments to reduce lateral resistance of high-speed amphibious vehicles. Liu et al [6] performed optimal design using CFD by selecting and analyzing shape control parameters as optimal design variables to reduce the hydrodynamic resistance of an amphibious vehicle, comparing the results with experiments. Jaouad et al [7] also focused on using CFD for amphibious vehicles to minimize drag and improve the aerodynamic performance characteristics of these vehicles.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Influence of Wheel Attachments on Resistance Performance of Amphibious Vessel for Marine Debris Collection

Jeong,

Nam,

Park

et al. 2024

JMSE

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This study aims to investigate the influence of wheel configurations on hydrodynamic resistance of an amphibious vessel through experiments and simulations. To evaluate the resistance performance associated with wheel attachments, three configurations were examined: vessel without attachments, with caterpillars, and with both caterpillars and shoe−paddles. A comprehensive series of computational fluid dynamics (CFD) simulations were conducted for these attachment types, complemented by experimental validations. The Volume-of-Fluid (VOF) model was employed in CFD simulations to capture the free surface movement, and the Dynamic Fluid–Body Interaction (DFBI) model was adopted to represent the two-degree-of-freedom motion of the vessel, specifically trim and sinkage. The total resistance derived from CFD simulations was calculated across a range of Froude numbers (Fns), including the design speed of the target vessel, and validated through model tests conducted in a wave basin equipped with a towing facility. The analysis indicated a general increase in resistance when attachments were added to the amphibious vessel. Remarkably, at the design speed (Fn = 0.27), the total resistance with both caterpillars and shoe−paddles exceeded that of the configuration without any attachments by more than 75.7%. These results provide crucial insights for the preliminary design stage of amphibious vessels, particularly those intended for marine debris collection in hard-to-reach areas.

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Energy efficiency research of propulsion system for series-parallel hybridization of amphibious vehicles

Sun,

Xin,

Gao

2024

Heliyon

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Resistance reduction optimization of an amphibious transport vehicle

Cited by 9 publications

References 26 publications

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Safety Analysis of Initial Separation Phase for AUV Deployment of Mission Payloads

Experimental and Numerical Study on Influence of Wheel Attachments on Resistance Performance of Amphibious Vessel for Marine Debris Collection

Energy efficiency research of propulsion system for series-parallel hybridization of amphibious vehicles

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