Analysis of a turbulent compressed flow by a second-order model

Abstract

This paper is concerned with the simulation of a turbulent flow submitted to a cyclic one-dimensional compression and expansion between two parallel flat pistons moving with opposite velocities in the direction of their perpendicular axis. The turbulence model used is the second-order model developed at a low Reynolds number by Craft and Launder. Numerical results show that the turbulent field may be considered as homogeneous in an extended part of the domain. The confinement effect appears mainly in the vicinity of the moving walls while the central region is especially influenced by the compression effect. The evolution of the heat flux, transferred from the fluid through the moving walls, tends to a zero limit cycle in the turbulent flow and to a non-zero limit cycle in the laminar flow. The disappearance of the turbulent energy is not predicted by the κ-e model