Pulsed impinging jets: Momentum and heat-transfer

Abstract

With increasing efficiencies of internal combustion engines, the accurate prediction of the heat transfer across walls, such as from temporally varying impinging jets, is of significant importance. To avoid the excessive cost of fully resolved simulations, this prediction often relies upon the modelling of the resulting non-equilibrium boundary layer using wall functions. Given the unsteady nature of the problem, it is important to understand the development of these boundary layers under non-equilibrium conditions and assess whether existing wall functions are suitable for modelling such flows. Thus, in this paper, the momentum and thermal boundary layers developing from a single pulsed imp..