This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Computational Cost and Accuracy of Spray Droplet Collision Models
Technical Paper
2019-01-0279
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
This study focuses on Lagrangian spray models that are commonly used in engine CFD simulations. In modeling sprays, droplet collision is one of the physical phenomena that must be accounted for. There are two main parts of droplet collision models for sprays - detecting colliding pairs of droplets and predicting the outcomes of these collisions. For the first part, we focus on the efficiency of the algorithm. We present an implementation of the arbitrary adaptive collision mesh model of Hou and Schmidt [1], and examine its efficiency in dealing with large simulations. Through theoretical analysis and numerical tests, we show that the computational cost of this model scales pseudo-linearly with respect to the number of parcels in the sprays. Regarding the second part, we examine the variations in existing phenomenological models used for predicting binary droplet collision outcomes. A quantitative accuracy metric is used to evaluate the models with respect to the experimental data set. To provide a holistic perspective, three different experimental datasets that contain over 2000 data points are collated, and used in the evaluation. These analyses show that the accuracy of the collision outcome prediction is between 65% to 70%, which indicates a need for future improvement.
Recommended Content
Authors
Topic
Citation
Agarwal, A., Wang, Y., Liang, L., Naik, C. et al., "The Computational Cost and Accuracy of Spray Droplet Collision Models," SAE Technical Paper 2019-01-0279, 2019, https://doi.org/10.4271/2019-01-0279.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Hou , S. and Schmidt , D.P. Adaptive Collision Meshing and Satellite Droplet Formation in Spray Simulations Int. J. Multiph. Flow 32 8 935 956 2006
- MacInness , J.M. and Bracco , F.V. Comparisons of Deterministic and Stochastic Computations of Drop Collisions in Dense Sprays Prog. Astronaut. Aeronaut. 1991
- Amsden , T.D. , O’Rourke , A.A. , and Butler , P.J. 1989
- Hou , S. , Are , S. , and Schmidt , D.P. A Generalized Adaptative Collision Mesh for Multiple Injector Orifices 13th Int. Multidimens. Engine Model. User’s Gr. Meet. SAE Congr 2003
- Schmidt , D.P. and Rutland , C.J. A New Droplet Collision Algorithm J. Comput. Phys. 164 1 62 80 2000
- Sun , R.D. and Reitz , Y. Modeling Low-Pressure Injections in Diesel HCCI Engines ILASS Americas, 20th Annual Conference on Liquid Atomization and Spray Systems Chicago 2007
- Munnannur , A. Droplet Collision Modeling in Multi-Dimensional Engine Spray Computations University of Wisconsin--Madison 2007
- Brazier-Smith , P.R. , Jennings , S.G. , and Latham , J. The Interaction of Falling Water Drops: Coalescence Proc. R. Soc. A Math. Phys. Eng. Sci. 326 1566 393 408 1972
- Qian , J. and Law , C.K. Regimes of Coalescence and Separation in Droplet Collision J. Fluid Mech. 331 1997
- Ko , G.H. and Ryou , H.S. Modeling of Droplet Collision-Induced Breakup Process Int. J. Multiph. Flow 31 6 723 738 2005
- Estrade , J.-P. , Carentz , H. , Lavergne , G. , and Biscos , Y. Experimental Investigation of Dynamic Binary Collision of Ethanol Droplets - A Model for Droplet Coalescence and Bouncing Int. J. Heat Fluid Flow 20 5 486 491 1999
- Brenn , G. , Valkovska , D. , and Danov , K.D. The Formation of Satellite Droplets by Unstable Binary Drop Collisions Phys. Fluids 13 9 2463 2477 2001
- Ashgriz , N. and Poo , J.Y. Coalescence and Separation in Binary Collisions of Liquid Drops J. Fluid Mech. 221 1 183 1990
- Sommerfeld , M. and Kuschel , M. Modelling Droplet Collision Outcomes for Different Substances and Viscosities Exp. Fluids 57 12 187 2016
- Munnannur , A. and Reitz , R.D. A New Predictive Model for Fragmenting and Non-Fragmenting Binary Droplet Collisions Int. J. Multiph. Flow 33 8 873 896 2007
- Jiang , Y.J. , Umemura , A. , and Law , C.K. An Experimental Investigation on the Behavior of Hydrocarbon Droplets J. Fluid Mech. 234 171 190 1992
- Georjon , T.L. and Reitz , R.D. A Drop-Shattering Collision Model for Multidimensional Spray Computations At. Sprays 9 3 231 254 1999
- 2019
- Reitz , R.D. Modeling Atomization Processes in High-Pressure Vaporizing Sprays At. Sprays 3 309 337 1987
- Reitz , R.D. and Beale , J.C. Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model At. Sprays 9 6 623 650 1999
- Willis , K. and Orme , M. Binary Droplet Collisions in a Vacuum Environment: An Experimental Investigation of the Role of Viscosity Exp. Fluids 34 1 28 41 2003