Algebraic coupled level set-volume of fluid method for surface tension dominant two-phase flows

Haghshenas, Majid; Wilson, James A.; Kumar, Ranganathan

doi:10.1016/j.ijmultiphaseflow.2016.12.002

Cited by 45 publications

(10 citation statements)

References 34 publications

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“…Interface tension related erroneous flows are best treated by improving the curvature calculation. This might be done using an (additional) height or level set function [92,[95][96][97][98][99]. Furthermore, a posterior damping of spurious velocities is possible by smoothing the curvature field and filtering interface-parallel velocities [86].…”

Section: Appendix a Spurious Velocitiesmentioning

confidence: 99%

Thermally driven convection in Li||Bi liquid metal batteries

Personnettaz

Beckstein

Landgraf

et al. 2018

Journal of Power Sources

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Liquid Metal Batteries (LMBs) are a promising concept for cheap electrical energy storage at grid level. These are built as a stable density stratification of three liquid layers, with two liquid metals separated by a molten salt. In order to ensure a safe and efficient operation, the understanding of transport phenomena in LMBs is essential. With this motivation we study thermal convection induced by internal heat generation. We consider the electrochemical nature of the cell in order to define the heat balance and the operating parameters. Moreover we develop a simple 1D heat conduction model as well as a fully 3D thermo-fluid dynamics model. The latter is implemented in the CFD library OpenFOAM, extending the volume of fluid solver, and validated against a pseudo-spectral code. Both models are used to study a rectangular 10×10 cm Li||Bi LMB cell at three different states of charge.

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Section: Appendix a Spurious Velocitiesmentioning

confidence: 99%

Thermally driven convection in Li||Bi liquid metal batteries

Personnettaz

Beckstein

Landgraf

et al. 2018

Journal of Power Sources

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“…It is well known that fluid physical properties make it changeable and pervasive, so that no matter how complex the structured surface of the part is, the fluid fully reaches the surface of the part being machined to achieve full finishing. [19][20][21][22] In recent years, related researchers made full use of the fluid flexible-profiling property to develop some fluid-based processing methods, including abrasive water jet polishing, abrasive flow machining, magnetorheological polishing, and elastic launch processing. [23][24][25][26][27] With respect to the processing mechanism, the abrasive flow in the abrasive water jet polishing and abrasive flow machining methods has a strong impact or high viscosity by exerting a strong jet force or squeeze pressure, in which the workpiece surface is strongly cut by the abrasive particles.…”

Section: Introductionmentioning

confidence: 99%

An ultrasonic-assisted soft abrasive flow processing method for mold structured surfaces

Zhu

2019

Advances in Mechanical Engineering

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As a fluid-based precise processing method, soft abrasive flow processing has been widely used in advanced electromechanical systems, complex mold manufacturing, and other engineering fields. Because of the low volume fraction of abrasive particles and micro-force/cutting removal characteristics, there exists a potential improvement in terms of processing efficiency and uniformity. In view of the above problems, this article presents an ultrasonic-assisted soft abrasive flow processing method. Based on the realizable k–ε turbulence model and the mixture flow model, an ultrasonic coupling enhancement dynamic model for soft abrasive flow is set up, and the kinetic energy transport equation of realizable k–ε turbulence model can be revised. Using particle image velocimetry technology, an on-line observation experimental platform for ultrasonic-assisted soft abrasive flow is developed to conduct the real-time acquisition of abrasive flow state and particle distribution in a constrained flow passage. An ultrasonic-assisted soft abrasive flow processing experimental platform is established to complete the processing experiment. The experimental results show that the ultrasonic excitation vibration can effectively enhance the turbulence intensity and distribution uniformity of the abrasive flow, the average processing time can be shortened by more than 6 h, and a better surface quality can be obtained.

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“…For the reduction of spurious currents it is required that the volume fraction and the interface normal vector ⃗ = ∇ |∇ | ⁄ are as smooth as possible since surface tension force is modelled as = ∇ , where = −∇ • ⃗ while using the CSF model [10]. Initially, interface normal vector is smoothed by interpolating it to cell vertices and then back to cell centre through inverse distance function [11]. In a uniform 2D mesh the above said interpolation routine results in…”

Section: Curvature Calculationmentioning

confidence: 99%

Assessment of Primary Breakup of Liquid Sheet Emanating from a Pressure Swirl Atomizer for Non-Newtonian Fluids

Kant

Banerjee

2021

ICLASS

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Numerical investigations were performed to determine the breakup length and spray cone angle of liquid sheet emanating from a pressure swirl atomizer. The working fluid was taken to be non-Newtonian in nature whose rheology can be represented as a power law fluid. The sheet morphology during its primary breakup was captured using Coupled Level Set VOF method that was implemented in an in-house two-phase Navier Stokes solver based on OpenFOAM libraries. The flow was assumed to be 2D axisymmetric. A parametric study was performed to determine the effect of injector geometry parameters like contraction ratio / , orifice length / and contraction angle ; injector operating condition like pressure drop across the injector Δ , density ratio / and inlet swirl ratio = ⁄ . Both shear thinning fluid and shear thickening fluids was investigated by varying the power law index, , between 0.5 to 1.5. The sheet breakup and its dynamics for non-Newtonian fluid will be compared with Newtonian fluid breakup mechanism.

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Algebraic coupled level set-volume of fluid method for surface tension dominant two-phase flows

Cited by 45 publications

References 34 publications

Thermally driven convection in Li||Bi liquid metal batteries

Thermally driven convection in Li||Bi liquid metal batteries

An ultrasonic-assisted soft abrasive flow processing method for mold structured surfaces

Assessment of Primary Breakup of Liquid Sheet Emanating from a Pressure Swirl Atomizer for Non-Newtonian Fluids

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