An Eulerian–Lagrangian hybrid model for the coarse-grid simulation of turbulent liquid jet breakup

Saeedipour, Mahdi; Pirker, Stefan; Bozorgi, Salar; Schneiderbauer, Simon

doi:10.1016/j.ijmultiphaseflow.2016.02.011

Cited by 31 publications

(12 citation statements)

References 18 publications

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“…Saeedipour et al [61] proposed a hybrid Eulerian-Eulerian and Eulerian-Lagrangian LES approach to include a mechanism of turbulent eddy interaction and subgrid droplet generation. To reduce the computational costs, DNS is not opted for primary atomization, and subgrid droplet generation must be modeled (cf.…”

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

“…In the modeling of droplet ejection in primary atomization, it is assumed that droplets will be generated from the liquid surface when the sum of the liquid turbulent eddy energy and the aerodynamic pressure energy exceeds the surface energy. Figure 13 schematically shows the physical picture envisioned in this modeling [61]. If the eddy motion in the liquid phase is stronger than the resistant force of surface tension, droplets will be generated from the surface.…”

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

“…Although details are not described in [61], the Reynolds stress model (RSM) [62] is used for the evaluation of Li v′ . It is not clearly stated in [61] how the empirical parameters sa C and si C are determined, but some tuning procedure is necessary using experimental or DNS data [61]. The present model does not need a Lagrangian part and implementation into any Eulerian code is straightforward.…”

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

“…Energies 2018, 11, x FOR PEER REVIEW 17 of 25 Figure 13. Physical picture of droplet ejection in the modeling [61]. The eddies in the liquid phase play an important role in droplet generation.…”

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

“…It can be seen that the overall spray evolution is well predicted. Reference [61] also presents several other cases under different flow conditions (not shown here). Since the droplet size is correlated with the Taylor microscale, the local variation of the eddy size leads to the difference in the droplet size.…”

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

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Recent Advances in Computational Modeling of Primary Atomization of Liquid Fuel Sprays

Shinjo

2018

Energies

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Recent advances in modeling primary atomization in order to enable accurate practical-scale jet spray simulation are reviewed. Since the Eulerian–Lagrangian method is most widely used in academic studies and industrial applications, in which the continuous gas phase is treated in the Eulerian manner and droplets are calculated as Lagrangian point particles, the main focus is placed on improvement within this framework, especially focusing on primary atomization where modeling is the weakest. First, limitations of the conventional methods are described and then novel modeling proposals intended to tackle these issues are covered. These new modeling proposals include the Eulerian surface density approach, and the hybrid Eulerian surface/Lagrangian subgrid droplet generation approach. Compared to conventional simple yet sometimes non-physical models, recent models try to include more physical findings in primary atomization which have been obtained through experiments or direct numerical simulation (DNS). Model accuracy ranges from one that still needs some adjustment using experimental or DNS data to one which is totally self-closed so that no parameter tuning is necessary. These models have the potential to overcome the long-recognized bottleneck in primary atomization modeling and thus to improve the accuracy of whole spray simulation, and may greatly help to improve the spray design for higher combustion efficiency.

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Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%

Section: Hybrid Eulerian-lagrangian Les Approachmentioning

confidence: 99%