An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations

2008-01-0970

04/14/2008

Event
SAE World Congress & Exhibition
Authors Abstract
Content
Lagrangian-Droplet and Eulerian-Fluid (LDEF) based spray models are widely used in engine and combustion system computations. Numerical grid and time-step-dependencies of Discrete Droplet Lagrangian spray models have been identified by previous researchers [1, 2]. The two main sources of grid-dependency are due to errors in predicting the droplet-gas relative velocity, and errors in describing droplet-droplet collision and coalescence processes. For reducing grid-dependency due to the relative velocity effects, results from gas jet theory are introduced along with a Lagrangian collision model [1, 3] and applied to model diesel sprays. The improved spray model is implemented in the engine simulation code KIVA-3V [4] and is tested under various conditions, including constant volume chambers and various engine geometries with vaporizing and combusting sprays with detailed chemistry. The results with the improved model show greater mesh-independency as compared to the conventional LDEF methodology.
Meta TagsDetails
DOI
https://doi.org/10.4271/2008-01-0970
Pages
26
Citation
Abani, N., Kokjohn, S., Park, S., Bergin, M. et al., "An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations," SAE Technical Paper 2008-01-0970, 2008, https://doi.org/10.4271/2008-01-0970.
Additional Details
Publisher
Published
Apr 14, 2008
Product Code
2008-01-0970
Content Type
Technical Paper
Language
English