Large Eddy Simulations of a turbulent periodic channel with conjugate heat transfer at low Prandtl number

Thermal striping is one of the possible initiator of pipe rupture. In this framework, thermal fluctuations in a heated periodic channel have been calculated using Large Eddy Simulation (LES). The fluid Prandtl number is set to 0.01 and the friction Reynolds number to 395. The Werner and Wengle Wall Function is used with the Navier-Stokes equations to reduce the computational cost. Satisfactory results can be noticed on the temperature fluctuations for low Prandtl number fluids. Several boundary conditions are considered, namely isothermal, isoflux, and conjugate heat transfer. The impacts of the wall properties on the temperature statistics for conjugated heat transfer boundary conditions are deeply analysed.