Browse Publications Technical Papers 2018-01-0176
2018-04-03

Assessment of Two Premixed LES Combustion Models in an Engine-Like Geometry 2018-01-0176

Large Eddy Simulation (LES) of premixed turbulent combustion in a confined cylinder setup at engine relevant conditions has been carried out for three different initial turbulence intensities, mimicking different flame propagation regimes. Direct Numerical Simulation (DNS) of the setup under investigation provides the reference data to be compared against. The DNS fields have been filtered on the LES grid and are used as initial conditions for the LES at onset of combustion, guaranteeing a direct comparability of the single realizations between the modeled and reference data. Two different combustion models, the G-Equation and CMC-premixed (Conditional Moment Closure) are compared with respect to their predictive capabilities as well as their usability and computational cost. While the G-Equation is a widely adopted approach for industrial applications and usually relies on a tunable turbulent flame speed closure, the novel LES-CMC comes as a tuning parameter free model. Both modeling approaches were in agreement with the reference data. However, LES-CMC leads to improved prediction accuracy for changing turbulence intensities. A sweep in the initial pressure in the LES has been performed in order to investigate numerically the effect of increasing the contribution of the subgrid models by decreasing the resolved part of the flame caused by the decreasing flame thickness at higher pressures.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A Visual Investigation of CFD-Predicted In-Cylinder Mechanisms That Control First- and Second-Stage Ignition in Diesel Jets

2019-01-0543

View Details

JOURNAL ARTICLE

Virtual Full Engine Development: 3D-CFD Simulations of Turbocharged Engines under Transient Load Conditions

2018-01-0170

View Details

TECHNICAL PAPER

Development of an Integrated Virtual Engine Model to Simulate New Standard Testing Cycles

2018-01-1413

View Details

X