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Wall-resolved LES of channel flow: A correlation for the discontinuity of εθ at the fluid-solid interface

Conjugate heat transfer represents the actual thermal coupling between a fluid and a solid part. It is of prime importance in nuclear industrial applications where fluctuating thermal stresses are a concern, e.g. in case of a severe emergency cooling (Pressurized Thermal Shock) or long-term ageing of materials such as thermal striping occurring in T-junctions. The present paper aims at contributing to the improvement of refined RANS approaches for conjugate heat transfer. Using wall-resolved LES of a turbulent channel flow at Re τ = 395 and P r = 0.71, a correlation for the discontinuity of e θ at the fluid-solid interface is proposed, based on 49 different combination of fluid-solid thermal properties ratios.