Simulation of liquid sloshing in 2D containers using the volume of fluid method

Elahi, Rasool; Passandideh-Fard, Mohammad; Javanshir, Alireza

doi:10.1016/j.oceaneng.2014.12.022

Cited by 50 publications

(9 citation statements)

References 38 publications

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“…The process is repeated until the solid deflection values (W n+1 ) converge. A similar concept of time dependent update of displacement values from fluid forces is described by Elahi et al (2015).…”

Section: Fluid-solid Couplingmentioning

confidence: 99%

Low Reynolds Number Effect on Energy Extraction Performance of Semi-Passive Flapping Foil

Javed

Djidjeli

Xing

2018

JAFM

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In this paper, 2-D numerical solution scheme is used to study the performance of semi-passive flapping foil flow energy harvester at Reynolds numbers ranging from 5000 to 50,000. The energy harvester comprises of NACA0015 airfoil which is supported on a translational spring and damper. An external sinosoidal pitch excitation is provided to the airfoil. Energy is extracted from the flow induced vibration of airfoil in translational mode. Movement of airfoil is accommodated in fluid domain by using a hybrid meshfree-Cartesian fluid grid. A body conformal meshfree nodal cloud forms the near field domain, encompassing the airfoil. During the simulation, the solid boundary causes the motion of the meshfree nodal cloud, without necessitating re-meshing. In the far field, the static Cartesian grid encloses and partly overlaps the meshfree nodal cloud. A coupled mesh based and meshfree solution scheme is utilized to solve laminar flow, viscous, incompressible equations, in Arbitrary-Lagrangian-Eulerian (ALE) formulation, over a hybrid grid. Spatial discretization of flow equations is carried out using radial basis function in finite difference mode (RBF-FD) over meshfree nodes and conventional finite differencing over Cartesian grid. Stabilized flow momentum equations are used to avoid spurious fluctuations at high Reynolds numbers. A closely coupled, partitioned, sub iteration method is used for fluid structure interaction. The study is focused to analyse the behaviour of flow energy harvesters at various Reynolds numbers. Effects of changing the translational spring stiffness and pitch activation frequency are also investigated. Instantaneous flow structures around the airfoil have been compared at different Reynolds numbers and pitch amplitudes. It is found that net power extracted by the system increases at high Reynolds numbers. Moreover, re-attachment of leading edge separation vortex plays an important role in ther overall system performance.

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Section: Fluid-solid Couplingmentioning

confidence: 99%

Low Reynolds Number Effect on Energy Extraction Performance of Semi-Passive Flapping Foil

Javed

Djidjeli

Xing

2018

JAFM

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“…On the other hand, the case of the heterogeneous incompressible liquid in the container was studied, first by Rayleigh and then, was the subject of limited number of works (Capodanno 1993;2001); ( Lamb 1932) and (Essaouini 2014). A twodimensional numerical model is developed by Elahi et al (2015) to study liquid sloshing in containers in presence of water/air free surface deformation, liquid viscosity and surface tension. The model is validated by a comprehensive comparison between the computational and theoretical/experimental results for various time-dependent linear/angular acceleration sloshing scenarios.…”

Section: Introductionmentioning

confidence: 99%

Sloshing Analysis of a Heterogeneous Viscous Liquid in Immovable Tank under Pitching Excitation

Bahaoui

Essaouini

Bakkali

2020

JAFM

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The effects of the heterogeneity of liquid on the tank sloshing under pitching excitation are analyzed and discussed. The time history of the free surface elevation for tank containing a homogeneousheterogeneous liquid are recorded and discussed. Numerical simulations are performed for various functions of density using the finite-element method. A theoretical model in the case of heterogeneous viscous liquid are developed using the variation formulation based on the Navier-Stokes equations. The effect of viscosity on the responses is also discussed for each case. In each case, the time history plots for the vertical fluid displacement at a select node, and the pressure in selected elements are presented to illustrate the results of numerical simulations. The effect of heterogeneity parameter of the amplitude of liquid sloshing in a two dimensional partially filled rectangular tank under pitch excitation is conducted to investigate the effects of excitation variable density on the liquid sloshing by a series of numerical experiments. The results are compared with existing theoretical study and the comparison shows fair agreement.

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“…It was implemented in numerous works for tracking the free surface motion, Mirzaii (2012), the deformation of the liquid-gas interface in containers Elahi (2015) and liquid sloshing in tanks with internal baffles, Alireza (2013). It was integrated in hybrid multifluid-VOF model to enable simulation of both the initial jet impingement and the long-time entrained bubble plume phenomena, Olabanji (2015).…”

Section: Introductionmentioning

confidence: 99%

Numerical Visualization of Plunging Water Jet using Volume of Fluid Model

Boualouache

Zidouni

Mataoui

2018

JAFM

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A plunging liquid jet is defined as a moving column of liquid passing through a gaseous headspace, air in our case, before impinging a free surface of receiving liquid pool. The mechanism of air entrainment due to plunging liquid jets is very complex and the complete mechanism of air entrainment is not fully understood so far. The present paper is an unsteady numerical simulation of air entrainment by water jet plunging, using the Volume Of Fluid (VOF) model. The piece wise linear interface construction algorithm (PLIC) for interface tracking is used, to describe the phase distributions of entirely immiscible air and liquid phases. The aim of this work is to investigate the performance and accuracy of the VOF method in predicting the initial impact between the descending jet and water free surface, air entrainment and the developing flow region under free surface. Three scale models based on geometric similarities (Froude number and dimensionless free jet length) are used for validation according to Chanson (2004) experience. The simulations show with accuracy, the air cavity formation steps, caused by the initial jet impact, its deep stretching under the pool free surface, until breakdown due to the shear created by a toroidal vortex. In terms of, air entrainment estimation, bubble dispersion and radial distribution of air volume fraction, large-scale models present a good agreement with the experience. However, for the smallest scale model, the results lead to suggest that air entrainment is governed by more parameters than the geometric similarities.

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Simulation of liquid sloshing in 2D containers using the volume of fluid method

Cited by 50 publications

References 38 publications

Low Reynolds Number Effect on Energy Extraction Performance of Semi-Passive Flapping Foil

Low Reynolds Number Effect on Energy Extraction Performance of Semi-Passive Flapping Foil

Sloshing Analysis of a Heterogeneous Viscous Liquid in Immovable Tank under Pitching Excitation

Numerical Visualization of Plunging Water Jet using Volume of Fluid Model

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