Computational and experimental characterization of a liquid jet plunging into a quiescent pool at shallow inclination

Deshpande, S. S.; Trujillo, Mario F.; Wu, Xiongjun; Chahine, Georges L.

doi:10.1016/j.ijheatfluidflow.2012.01.011

Cited by 44 publications

(49 citation statements)

References 25 publications

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“…Previous tests by the authors [20] confirmed that the discretization schemes (both for space and time), solution algorithms and solver settings indicated in [17] are the most suitable for the investigated cases. Automatic time step adaptation was used to keep the Courant-Friedrichs-Lewy (CFL) number under the limit of 0.3 which is requested by the peculiar interface compression scheme used in interFoam for 3D simulations [13].…”

Section: Numerical Simulationsmentioning

confidence: 79%

“…In strict terms, such an additional term is a mass source, but both literature results [17] and verification by the authors proved that mass variation is completely negligible.…”

Section: Numerical Simulationsmentioning

confidence: 89%

“…OpenFOAM ® was selected due to its free and open source nature and to the many favorable reviews and successful cases of application described in the literature [e.g. [13][14][15][16][17]. interFoam is a isothermal finite volume solver implementing a modified version of the Volume of Fluid (VOF) [18] method to simulate two-phase flow using a single set of equations.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…1), to obtain interface compression down to just 2-4 cells. The full set of the governing equations solved by interFoam is thoroughly described in [13,14,17]. In summary, it is constituted by the incompressible continuity and Navier-Stokes equation system, plus an equation for the transport of the volume fraction (also called color function)…”

Section: Numerical Simulationsmentioning

confidence: 99%

See 3 more Smart Citations

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

Guilizzoni

Santini

Lorenzi

et al. 2014

J. Phys.: Conf. Ser.

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Section: Numerical Simulationsmentioning

confidence: 79%

“…In strict terms, such an additional term is a mass source, but both literature results [17] and verification by the authors proved that mass variation is completely negligible.…”

Section: Numerical Simulationsmentioning

confidence: 89%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

Guilizzoni

Santini

Lorenzi

et al. 2014

J. Phys.: Conf. Ser.

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“…On the other hand, engine sprays, and sprays in general, could be better described using a continuum for both the liquid and the gas phases, where conservation laws are solved under Eulerian flow assumptions and grid is refined until its resolution allows for solving droplets or bubbles without introducing any conceptual particles. In such a case, a transport equation for an indicator function is used to track the liquid-gas interface [11,12,13]. In this work the Volume-of-fluid (VOF) approach is adopted: governing equations are solved for a fluid whose thermophysical properties are a weighted average of the liquid and the vapor phases according to the liquid fraction.…”

Section: Introductionmentioning

confidence: 99%

VOF Simulation of The Cavitating Flow in High Pressure GDI Injectors

Giussani¹,

Montorfano²,

Piscaglia³

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The paper describes the development in the OpenFOAM ® technology of a dynamic multiphase Volume-of-Fluid (VoF) solver, supporting mesh handling with topological changes, that has been used for the study of the physics of the primary jet breakup and of the flow disturbance induced by the nozzle geometry during the injector opening event in high-pressure Gasoline Direct Injection (GDI) engines. Turbulence modeling based on a scale-resolving approach has been applied, while phase change of fuel is accounted by means of a cavitation model that has been coupled with the VOF solver. Simulations have been carried out on a 6-hole prototype injector, especially developed for investigations in the framework of the collaborative project FUI MAGIE and provided by Continental Automotive SAS. Special attention has been paid to the domain decomposition strategy and to the code development of the solver, to ensure good load balancing and to minimize inter-processor communication, to achieve good performance and also high scalability on large computing clusters. KeywordsVolume-of-fluid, GDI injectors, topologically changing mesh, hybrid RANS/LES, cavitation, OpenFOAM ® Introduction Turbulence certainly has a direct impact on thermodynamic efficiency, brake power and emissions of the engine, since its influence extends from volumetric efficiency to air/fuel mixing, combustion and heat transfer. In a gasoline engine, there are two strategies for injecting the fuel: Port Fuel Injection (PFI), a well known technology to favor air/fuel mixing, and Gasoline Direct Injection (GDI), which consists in injecting the fuel directly into the cylinder. GDI is becoming a common solution in automotive industry since it allows for a great flexibility in the air/fuel ratio, leading to low fuel consumption and emissions at light loads (lean or stratified mode) and high power output during rapid accelerations and heavy loads (power mode) [1,2]. These different conditions are not only related to the amount of fuel injected into the combustion chamber, but also to the way the injection is performed: level of atomization, penetration and diffusion of fuel. Experimental campaigns showed that spray formation is mainly influenced by the geometry of the injector itself (L/D ratio, number of holes, internal geometry, etc.) [3,4], the operating pressure and the needle lift curve [5]. Fuel is characterized by high velocities (order of hundreds of meters per second) and reduced timescales, so that time-transient phenomena play an important role. Moreover, because of the strong acceleration of the liquid phase inside the injector nozzle, pressure may drop below the saturation value causing the onset of cavitation, which strongly modifies the internal flow field due to the presence of bubbles. Hence, a better comprehension of spray characteristics could help to improve engine performance and injector design. Simulating the injector opening event and the spray primary breakup are still on the frontier of modern modeling science. Since primary breakup is ...

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Numerical and experimental investigation on surface air entrainment mechanisms of a novel long‐short blades agitator

et al. 2017

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We investigate numerically and experimentally the mechanisms of surface air entrainment in the vessels equipped with the long‐short blades agitator. VOF method coupled with LES model is used to visualize the surface air entrainment process. In the case of partial submergence of the long blades (LBs), the interaction of the LBs with the liquid free surface creates a depression behind the LBs. Backfilling of the liquid into the depression leads to gas separation and entrapping into the liquid. The critical tip velocity of the LBs, utip,c, for the onset of gas entrainment is measured in vessels with diameters, T = 200∼600 mm. It is found that when H/T ≥ 1.0, utip,c is determined by the LBs, independent of the liquid level. utip,c is also affected by the size of the vessel through the diameter of the sweeping circle of the LBs, but for substantially large vessels, it approaches a constant value. © 2017 American Institute of Chemical Engineers AIChE J, 63: 316–325, 2018

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Computational and experimental characterization of a liquid jet plunging into a quiescent pool at shallow inclination

Cited by 44 publications

References 25 publications

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

Micro computed tomography and CFD simulation of drop deposition on gas diffusion layers

VOF Simulation of The Cavitating Flow in High Pressure GDI Injectors

Numerical and experimental investigation on surface air entrainment mechanisms of a novel long‐short blades agitator

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