CFD simulations of two opposing plane wall jets in a generic empty airplane cabin: Comparison of RANS and LES

Accurate computational fluid dynamics (CFD) simulations of the ventilation flow in airplane cabins are important for design optimisation regarding passenger health, thermal comfort and energy efficiency. The complex unsteady phenomena inside cabin challenging numerical modelling therefore dedicated validation simulation outcomes is required. majority studies performed steady Reynolds-averaged Navier-Stokes (RANS) focused mainly on global field characteristics. This paper presents both RANS transient simulations, including large eddy (LES), driven by opposing plane wall jets a reduced-scale isothermal water-filled generic cabin. A detailed analysis mean velocity turbulence characteristics (including Reynolds stresses) outlined, encompassing thorough investigation fundamental components such as merged jet. Specific attention devoted to LES grid sensitivity performance different subgrid-scale (SGS) models assessed comparison with particle image velocimetry (PIV) measurements. It shown that general performs much better than RANS, latter being incapable providing accurate within interaction zone jet due underlying dynamic interaction. Unsteady partly covers unsteadiness, however, levels remain systematically underpredicted required correct representation. Differences between SGS model predictions limited kinetic budget total turbulent energy.