Abstract
The feasibility of using a scale-adaptive turbulence model for the simulation of the unsteady flow in Internal Combustion (IC) Engines is investigated. The original theory of the Dynamic Length-Scale Resolution Model (DLRM), which includes an adaptive rescaling procedure for the modeled turbulent length and time scales, has been trimmed and applied to the simulation of the flow field of a geometrically simplified square-piston engine working under motored conditions. The flow field exhibits a strong tumbling motion, which is a major characteristic of modern turbo-charged, direct-injection gasoline engines. Multiple consecutive cycles have been computed and turbulent statistics, including the ensemble mean and the variance of the velocity field, have been compared with both experimental measurements and simulation results predicted by URANS and conventional LES with identical numerical setups.
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