Large Eddy Simulation of a motored single-cylinder piston engine: numerical strategies and validation

This paper describes a compressible Large Eddy Simulation (LES) used to investigate cyclic variations for nonreacting flow in an optical single cylinder engine setup. The simulated operating point is part of a large experimental database designed to validate LES for cycle-to-cycle prediction, and constitutes a first step towards the realization of fired operating points. The computational domain covers almost the whole experimental setup (intake and exhaust plenums, intake and exhaust ducts, cylinder) to account for acoustic phenomena. The assessment of the computation is performed in two regions of the domain: the intake and exhaust duct predictions are compared to the results of a Helmholtz solver and the experiment (pressure transducers and Particle Image Velocimetry (PIV)) while the in-cylinder dynamics are confronted to PIV measurements. The ability of the developed methodology to capture the correct level of cycle-to-cycle variations B. Enaux CERFACS, CFD Team, 42 Avenue G. Coriolis, 31057 Toulouse Cedex 01, France PSA Peugeot Citroën DRIA, 2 Route de Gisy, 78943 Velizy-Villacoublay Cedex, France V. Granet CERFACS, CFD Team, 42 Avenue G. Coriolis, 31057 Toulouse Cedex 01, France Renault SAS, 1 Avenue du Golf, 78288 Guyancourt Cedex, France O. Vermorel CERFACS, CFD Team, 42 Avenue G. Coriolis, 31057 Toulouse Cedex 01, France E-mail: [email protected] C. Lacour IFP, 1 & 4 Avenue de Bois-Préau, 92852 Rueil-Malmaison Cedex, France L. Thobois PSA Peugeot Citroën DRIA, 2 Route de Gisy, 78943 Velizy-Villacoublay Cedex, France V. Dugué Renault SAS, 1 Avenue du Golf, 78288 Guyancourt Cedex, France T. Poinsot Université de Toulouse, IMFT, France