The influence of obliquely perforated dual-baffles on sway induced tank sloshing dynamics

Saghi, Hassan; Mikkola, Tommi; Hirdaris, Spyros

doi:10.1177/1475090220961920

Cited by 10 publications

(4 citation statements)

References 42 publications

(47 reference statements)

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“…In the present study, a submerged bare hull of a UV was modelled in a viscous and incompressible fl uid so that the fl uid fl ow was considered turbulent. Accordingly, Reynolds Averaged Navier Stokes (RANS) equations are used as the governing equations [24][25][26][27]:…”

Section: Methodology / Metodologijamentioning

confidence: 99%

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

Saghi¹,

Parunov²

2023

Naše more

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Power reduction is the central goal to maximize cruising duration of tourist underwater vehicles (UV) that can be achieved by shaping the hull. So, in this paper, hydrodynamic force of resistance of the tourist UV’s bare hull is analysed. A numerical model based on Computational Fluid Dynamics in OpenFOAM is developed to simulate the longitudinal movement of an UV in a viscous and incompressible fluid for the infinite water depth. Three head geometries, including both spherical heads (S-S), spherical bow and elliptical stern head (S-E), and UV with both elliptical heads (E-E) are compared. At the first step, the effects of the length-to-diameter ratio and forward speed is studied for the S-S UV. The mesh size is calibrated using Grid Convergence Index, provided by ASME, while the model validation is based on the results for cube and sphere as well as by comparison with resistance coefficient of a SUBOFF bare hull. S-E and E-E UVs are then analysed for typical length-to-diameter ratio, comparing their force of resistance to the S-S type. The elongated elliptical heads are in many cases found favourable compared to the spherical heads. The results of this study may be useful for the conceptual design of tourist UV and for verification of the complex numerical models that are necessary to account for the influence of appendages on the force of resistance of such innovative UV.

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Section: Methodology / Metodologijamentioning

confidence: 99%

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

Saghi¹,

Parunov²

2023

Naše more

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“…Porous baffles can also modify the system's natural frequency [11], but they play a more significant role by extracting energy from the system and damping the motion [12,13]. There have been significant experimental and numerical studies on the effect of porous baffles on forced systems (not dynamically coupled), in particular focusing on their position, size and material construction [14][15][16][17][18][19][20][21][22][23]. The key features of the baffles turn out to be their size and construction.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of shallow-water sloshing coupled to horizontal vessel motion in the presence of a time-dependent porous baffle

Turner

2024

J Eng Math

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Shallow-water fluid sloshing in the Lagrangian Particle Path formulation, with the addition of an energy-extracting porous baffle, is simulated numerically using a symplectic numerical scheme which captures, in an essential way, the energy exchange. The fluid motion in a rectangular vessel is dynamically coupled to a surface-piercing porous baffle. The fluid transmission through the baffle is characterized by a nonlinear Darcy–Forchheimer model equation. The numerical scheme is symplectic, based on the implicit-midpoint rule, and thus is strategically designed to maintain the energy partition between the fluid and vessel throughout numerous time steps. Our results demonstrate the non-conservative nature of the system, with the porous baffle effectively dissipating energy from the overall system. Furthermore, we present findings that demonstrate the role of time-periodic variations in baffle porosity on energy dissipation. By manipulating the frequency and magnitude of this time-dependent variability, it is established that a greater amount of energy can be extracted from the system compared with the optimal fixed porosity baffle. These results shed new light on potential strategies for enhancing energy dissipation in such configurations.

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“…As a result, linear elasticity may underestimate the displacement and stress in such structures, leading to inaccurate predictions of their behavior and potentially compromising their safety. More literature survey for reviewing the literature on the recent papers about vibration control systems (e.g., TLD) and soil-structure interaction [52][53][54][55][56] could show the advantages of the considering solid nonlinearity in FSI estimation.…”

Section: Introductionmentioning

confidence: 99%

Coupling of a Nonlinear Structure with Sloshing

Jamalabadi

2023

Mathematical Problems in Engineering

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In this paper the role of solid nonlinearity on the fluid–structure interaction (FSI) is studied. First a simple mass-spring-damper system with a third-degree spring is coupled with a linear sloshing system to study the effect of solid nonlinearity. It shows that even both systems show similar behavior in free vibration tests, but nonlinearity caused 50% less on the amplitude of vibration. Then a higher order solid system coupled with a sloshing tuned liquid damper which is modeled by boundary element method (BEM) is examined. Finally, the coupling of a nonlinear solid with the sloshing system calculated at high-resolution method of smoothed particle is analyzed. The results reveal that considering surface nonlinearity in BEM has not improved the prediction significantly and the full NavierStokes calculations is in another phase and amplitude to a step response of the system even after two periods of the system in comparison with linear estimation. As shown the nonlinearity in solid part can cause a big difference in response of coupled system that pointed the necessity of the use of accurate fluid models such as BEM or smoothed particle hydrodynamics method as well as solid system identification before the coupling.

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The influence of obliquely perforated dual-baffles on sway induced tank sloshing dynamics

Cited by 10 publications

References 42 publications

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

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

Numerical simulations of shallow-water sloshing coupled to horizontal vessel motion in the presence of a time-dependent porous baffle

Coupling of a Nonlinear Structure with Sloshing

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