Realizability improvements to a hybrid mixture-bubble model for simulation of cavitating flows

Ghahramani, Ebrahim; Arabnejad, Mohammad Hossein; Bensow, Rickard

doi:10.1016/j.compfluid.2018.06.025

Cited by 21 publications

(18 citation statements)

References 21 publications

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“…In cavitation erosive cases, pressure waves are created during the cavity collapse and impact the nearby walls, which can lead to material damage. Fast condensation rates can predict such high values in pressure at the end phase of cavities collapse [14,15]; simulations with compressible liquids can predict pressure wave propagation patterns. The maximum pressure peaks can then be recorded on the surfaces and associated with erosion risk.…”

Section: Numerical Modelmentioning

confidence: 99%

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A numerical study on the effect of cavitation erosion in a diesel injector

Cristofaro

Edelbauer

Koukouvinis

et al. 2020

Applied Mathematical Modelling

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The consequences of geometry alterations in a Diesel injector caused by cavitation erosion are investigated with numerical simulations. The differences in the results between the nominal design geometry and the eroded one are analyzed for the internal injector flow and spray formation. The flow in the injector is modeled with a 3-phase Eulerian approach using a compressible pressure-based multiphase flow solver. Cavitation is simulated with a non-equilibrium mass transfer rate model based on the simplified form of the Rayleigh-Plesset equation. Slip velocity between the liquid-vapor mixture and the air is included in the model by solving two separate momentum conservation equations. The eroded injector is found to result to a loss in the rate of injection but also lower cavitation volume fraction inside the nozzle. The injected sprays are then simulated with a Lagrangian method considering as initial conditions the predicted flow characteristics at the exit of the nozzle. The obtained results show wider spray dispersion for the eroded injector and shorter spray tip penetration.

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Section: Numerical Modelmentioning

confidence: 99%

“…The prediction of cavitation erosion has been the subject of a wide range of research [4,5,6,7,8,9,10,11,12,13,14,15]. Among them, experimental campaigns are of great importance to obtain a deeper understanding of the underlying physics and to allow the validation of numerical models.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the effect of cavitation erosion in a diesel injector

Cristofaro

Edelbauer

Koukouvinis

et al. 2020

Applied Mathematical Modelling

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show abstract

“…In contrast to a purely Eulerian approach, the simulation of Lagrangian bubble dynamics enabled the calculation of medium to high frequency pressure fluctuations induced by cavitation. Ghahramani, Arabnejad & Bensow (2018) developed a multi-scale model similar to Vallier (2013), wherein larger cavities are considered in the Eulerian framework while smaller cavities are treated as Lagrangian bubbles. Although, in contrast to other approaches discussed above (Vallier 2013;Lidtke 2017;Ma et al 2017) their approach transforms small vapour clouds into multiple Lagrangian bubbles and, based on the Eulerian vapour volume fraction, a Lagrangian bubble is introduced into each control volume of a small cavity.…”

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confidence: 99%

Numerical assessment of cavitation-induced erosion using a multi-scale Euler–Lagrange method

Peters

Moctar

2020

J. Fluid Mech.

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“…Hence, the earlier hybrid models include simplifications in the Lagrangian representation and Eulerian–Lagrangian transition algorithm, which can lead to other numerical issues. Some of these issues, which cause spurious pressure pulses in the flow field, have been addressed in an earlier study (Ghahramani, Arabnejad & Bensow 2018).…”

Section: Introductionmentioning

confidence: 99%