DNS of Turbulent Heat Transfer on the Flat Plate Under Pulsating Flow Conditions

抄録

For the design of fuel-efficient reciprocating engines, it is necessary to estimate heat transfer loss from the cylinder under flow pulsation. However, conventional turbulence models based on a standard wall function and constant turbulent Prandtl number assumption for turbulent heat flux, which are often used for parametric study in engine design, may not be able to take into account the effect of pulsating flows on unsteady wall heat transfer. In this study, DNS of pulsating turbulent flows and heat transfer on the flat plate was conducted for validation of the conventional models and to check the applicability of the standard wall function and analogy between momentum transfer and heat transfer. The results indicated that prediction capability of heat transfer may be deteriorated by using the standard wall-function and the analogy between momentum and heat transfer.