LES of turbulent liquid jet primary breakup in turbulent coaxial air flow

Feng, Xiao; Dianat, Mehriar; McGuirk, James J.

doi:10.1016/j.ijmultiphaseflow.2013.11.013

Cited by 91 publications

(56 citation statements)

References 39 publications

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“…This method has been used in the literature to provide satisfactory simulated flows in a wide variety of configurations. 30,34,35 III. PRELIMINARIES…”

Section: Methodsmentioning

confidence: 99%

Initial condition effects on large scale structure in numerical simulations of plane mixing layers

McMullan

Garrett

2016

Physics of Fluids

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In this paper Large Eddy Simulations are performed on the spatially developing plane turbulent mixing layer. The simulated mixing layers originate from initially laminar conditions. The focus of this research is on the e↵ect of the nature of the imposed fluctuations on the large-scale spanwise and streamwise structures in the flow. Two simulations are performed; one with low-level three-dimensional inflow fluctuations obtained from pseudo-random numbers, the other with physically-correlated fluctuations of the same magnitude obtained from an inflow generation technique. Where white-noise fluctuations provide the inflow disturbances, no spatially stationary streamwise vortex structure is observed, and the large-scale spanwise turbulent vortical structures grow continuously and linearly. These structures are observed to have a three-dimensional internal geometry with branches and dislocations. Where physically-correlated provide the inflow disturbances a 'streaky' streamwise structure that is spatially stationary is observed, with the large-scale turbulent vortical structures growing with the square-root of time. These large-scale structures are quasi-two-dimensional, on top of which the secondary structure rides. The simulation results are discussed in the context of the varying interpretations of mixing layer growth that have been postulated. Recommendations are made concerning the data required from experiments in order to produce accurate numerical simulation recreations of real flows.

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“…This method has been used in the literature to provide satisfactory simulated flows in a wide variety of configurations. 30,34,35 III. PRELIMINARIES…”

Section: Methodsmentioning

confidence: 99%

Initial condition effects on large scale structure in numerical simulations of plane mixing layers

McMullan

Garrett

2016

Physics of Fluids

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“…It has been implemented [12] into the general purpose open source solver OpenFOAM [13] using a formulation suitable for general unstructured grids. Details of the CLSVOF method implemented in an in-house code for structured grids with no contact models can be found in [14], and [15,16,17,18]. The topology of the two-phase flow is represented by two properties; VOF represents the liquid volume fraction and LS is the shortest distance from the interface, positive within the liquid, negative outside and zero on the interface.…”

Section: Methodsmentioning

confidence: 99%

Coupled Level-Set Volume of Fluid Simulations of Water Flowing Over a Simplified Drainage Channel With and Without Air Coflow

Dianat¹,

Skarysz²,

Hodgson³

et al. 2017

SAE Int. J. Passeng. Cars - Mech. Syst.

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INTRODUCTIONPredicting and controlling the motion of rainwater over the exterior of road vehicles, EWM, is an important consideration for vehicle designers. Phenomena such as A-pillar overflow can obscure a driver's vision and droplets or rivulets falling on passengers or their belongings can be a significant source of customer dissatisfaction.There are a wide range of engineering applications involving the flow of liquid films, rivulets and droplets over solid surfaces. For example, water or ice on an airplane wing can significantly interfere with its overall performance [1,2]. Rivulets are also observed in coating flows in the chemical industry [3]. In the automotive sector examples of EWM simulations can be found in [4] and [5] that both use Lagrangian particle tracking for the airborne droplets and a simple 2D film model for the surface flow. While the approach to the dispersed phase (airborne) may be satisfactory, the assumption that the surface flow can be modelled using a 2D film has limitations. These 2D film models, details of which can be found in [6] for example, solve transport equations for the film thickness but make no attempt to resolve the 3D shape of the surface water. Using such film methods behaviour such as film-stripping and breakup can only be modelled empirically, with the results being valid within certain flow regimes. More fundamentally the two-way interaction between the aerodynamic drag on the water and the shape of the water feature cannot be predicted using such methods.The objective here is to develop and demonstrate a computational method that can capture the underlying physics and predict the motion of various liquid flow features on the exterior surface of vehicles. By predicting the resolved 3D shape of the droplet it is hoped that this will be more general than existing thin film models. By resolving water features fully in 3D it is possible to predict droplet breakup or coalescence without the need for empirical modelling as is the case for film models. ABSTRACTThe motivation for this paper is to predict the flow of water over exterior surfaces of road vehicles. We present simulations of liquid flows on solid surfaces under the influence of gravity with and without the addition of aerodynamic forces on the liquid. This is done using an implementation of a Coupled Level Set Volume of Fluid method (CLSVOF) multiphase approach implemented in the open source OpenFOAM CFD code. This is a high fidelity interface-resolving method that solves for the velocity field in both phases without restrictions on the flow regime. In the current paper the suitability of the approach to Exterior Water Management (EWM) is demonstrated using the representative test cases of a continuous liquid rivulet flowing along an inclined surface with a channel located downstream perpendicular to the oncoming flow. Experimental work has been carried out to record the motion of the rivulet in this case and also to measure the contact angle of the liquid with the solid surface. The measurements of the liquid/...

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“…This method has been used extensively in recent research, being used to specify inflow conditions for plane mixing layers, 31,32 axisymmetric jet flows, 33 and multiphase flow. 34 In all of these flow configurations, the turbulent inlet condition produced main simulation flow-fields with accurate flow statistics.…”

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confidence: 99%

The Effect of Initial Conditions on Streamwise Vortices in the Plane Turbulent Mixing Layer

McMullan

Garrett

2015

22nd AIAA Computational Fluid Dynamics Conference

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In this research we investigate the effect of inflow conditions on the streamwise vortices that exist in the plane turbulent mixing layer. Both initially-laminar and initially-turbulent mixing layers are considered here. The effect of the imposed fluctuations is assessed in the initially-laminar mixing layer simulations through the use of a white noise disturbance environment, and a physically-correlated fluctuation environment produced by an inflow generation method. The initially-turbulent mixing layer has its inflow condition produced by the inflow generation method. Each simulation produces good statistical agreement with the experimental data. The initially-laminar simulation with correlated fluctuations predicts the presence of statistically stationary streamwise vortices, whilst the other two simulations do not.

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LES of turbulent liquid jet primary breakup in turbulent coaxial air flow

Cited by 91 publications

References 39 publications

Initial condition effects on large scale structure in numerical simulations of plane mixing layers

Initial condition effects on large scale structure in numerical simulations of plane mixing layers

Coupled Level-Set Volume of Fluid Simulations of Water Flowing Over a Simplified Drainage Channel With and Without Air Coflow

The Effect of Initial Conditions on Streamwise Vortices in the Plane Turbulent Mixing Layer

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