Simulation of primary atomization with an octree adaptive mesh refinement and VOF method

Fuster, Daniel; Bagué, Anne; Boeck, Thomas; Moyne, Luis Le; Leboissetier, Anthony; Popinet, Stéphane; Ray, Pascal; Scardovelli, Ruben; Zaleski, Stéphane

doi:10.1016/j.ijmultiphaseflow.2009.02.014

Cited by 214 publications

(106 citation statements)

References 59 publications

(75 reference statements)

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“…The motivation of this paper is thus to present recent achievements in two-phase flow study based on up-to-date numerical methods. The numerical techniques used here combine two classical methods, namely, the Volume-of-Fluid method (VOF) that allows a good treatment of the interface, with the Adaptive Mesh Refinement (AMR), which optimize the numerical calculations as discussed earlier in [39,17]. In this paper, after a brief review of important recent developments in numerical methods, we illustrate what is now achievable through three typical two-phase flow studies in air-water conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of droplets, bubbles and waves: state of the art

et al. 2009

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Abstract. This work present current advances in the numerical simulation of twophase flows using a VOF method, balanced-force surface tension and quad/octree adaptive mesh refinement. The simulations of the atomization of a liquid sheet, the capillary retraction of a liquid sheet and two-and three-dimensional wave breaking all for air/water systems, are used to show the potential of the numerical techniques. New simulations of atomization processes for air/water conditions are allowing to investigate the processes leading to the appearance of instabilities in the primary atomization zone in real conditions. For the retracting liquid sheet, the new simulations show that two different regimes can be encountered as a function of the Ohnesorge number. For large values, a laminar flow is encountered inside the rim and a steady state is reached after a quick transient state. For small values, a turbulent flow is generated inside the rim which is responsible of large oscillations in the rim size and neck thickness. The breaking wave case study demonstrates the orders-of-magnitude efficiency gains of the adaptive mesh refinement method.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of droplets, bubbles and waves: state of the art

et al. 2009

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“…Recently, the numerical solution of hydrodynamic instability at the interface of two viscous layers using VOF method has been examined by Zaleski et al In the article [3], [8], comparison of the VOF method with linear access based on solution of two coupled Orr-Sommerfeld equations assembled for both phases is presented. The solution according to this method is discussed, inter alia, in articles [16], [4], [2], [20].…”

Section: Figurementioning

confidence: 99%

“…It can be seen, for example, in the breaking of waves on the sea surface at high speeds of the external air stream, it is an important part of the preparation of fuel in combustion engines or aerosol drug dosage forms. As a side effect, it occurs in piping systems such as turbine engines [8]. The present article is an introduction into atomization of thin liquid wall films.…”

Section: Introductionmentioning

confidence: 99%

Introduction to liquid wall film atomization

Knotek

Jícha

2012

EPJ Web of Conferences

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“…However, in the last decade, with the increase of the available computing power, different interfacial problems have been successfully tackled using it. Examples are the simulation of the drop breakup phenomenon by Renardy [13], the bubble motion by Annaland et al [14], the solution of wave impact problems by Kleefsman et al [15] or the numerical study of primary and impinging jet atomizations by Fuster et al [16], Tomar et al [17] and Chen et al [18].…”

Section: Introductionmentioning

confidence: 99%

Parallel load balancing strategy for Volume-of-Fluid methods on 3-D unstructured meshes

Jofre

Borrell

Lehmkuhl

et al. 2015

Journal of Computational Physics

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UPCommonsPortal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Abstract: Volume-of-Fluid (VOF) is one of the methods of choice to reproduce the interface motion in the simulation of multi-fluid flows. One of its main strengths is its accuracy in capturing sharp interface geometries, although requiring for it a number of geometric calculations. Under these circumstances, achieving parallel performance on current supercomputers is a must. The main obstacle for the parallelization is that the computing costs are concentrated only in the discrete elements that lie on the interface between fluids. Consequently, if the interface is not homogeneously distributed throughout the domain, standard domain decomposition (DD) strategies lead to imbalanced workload distributions. In this paper, we present a new parallelization strategy for general unstructured VOF solvers, based on a dynamic load balancing process complementary to the underlying DD. Its parallel efficiency has been analyzed and compared to the DD one using up to 1024 CPU-cores on an Intel SandyBridge based supercomputer. The results obtained on the solution of several artificially generated test cases show a speedup of up to 12x with respect to the standard DD, depending on the interface size, the initial distribution and the number of parallel processes engaged. Moreover, the new parallelization strategy presented is of general purpose, therefore, it could be used to parallelize any VOF solver without requiring changes on the coupled flow solver. Finally, note that although designed for the VOF method, our approach could be easily adapted to other interface-capturing methods, such as the Level-Set, which may present similar workload imbalances. SUMMARY OF CHANGESAccordingly to the comments raised by the reviewer, the changes on the manuscript are:1. As suggested by Reviewer #1: (1) Eq. 3 is valid only for divergence-free velocity fields, hence, this condition has been introduced in the text; (2) the limits of the sum in the numerator of Eqs. 9 -11 were incorrect, therefore, they have been corrected to start at 0 and end at P-1; (3) the description of Fig. 10 has been improved.2. The reviewer observed that Alg. 4 did not scale in terms of memory, since vector WI gathered information from all processes and, thus, grew with the size of the problem and number of CPU-cores. This may had become a bottleneck on larger scale tests. Therefore, we have developed a new version of the algorithm overcoming such limitations. The new version is based on non-blocking point-to-point communications.The new algorithm has substituted the previous one on the manuscript, and all tests for the LB strategy have been repeated and the results updated. Since Alg. 4 represents only 5% of the algorithm time, its upgrading has provided rather small improvements on the results. Even so, the important point is that the memory bottleneck has been eliminated.3. Furthermore, we have corrected some minor errors and we have tried to improve the wording across all the manuscrip...

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Simulation of primary atomization with an octree adaptive mesh refinement and VOF method

Cited by 214 publications

References 59 publications

Numerical simulation of droplets, bubbles and waves: state of the art

Numerical simulation of droplets, bubbles and waves: state of the art

Introduction to liquid wall film atomization

Parallel load balancing strategy for Volume-of-Fluid methods on 3-D unstructured meshes

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