Conjugated Heat Transfer in the Spatial Laminar-Turbulent Transition

Abstract

The conjugate heat transfer in the spatial laminar-turbulent transition is studied using direct numerical simulation (DNS). For that purpose, a three-dimensional (3D) module that solves the conduction equation in a solid is implemented and coupled to the Navier-Stokes equation solver Incompact3d. This module allowing to avoid an artificial imposition of the thermal boundary condition right on the fluid. First, the code is validated testing fully developed laminar flow conditions (Re = 100, Pr = 0:71). In this regime, results are very well compared with an in-house 2D code. Finally, the spatial laminar-turbulent transition at Re = 3420 and Pr = 0:71 is simulated to study the effect of the channel walls on the Nusselt number.