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Large eddy simulation in Code_Saturne of thermal mixing in a T junction with brass walls

DOI: 10.1615/ICHMT.2015.THMT-15.900
pages 439-442

Richard J. A. Howard
Dept Fluid Mechanics, Energy and Environment, EDF R&D, Chatou, France

Eric Serre
Aix-Marseille Universite, CNRS, Ecole Centrale Marseille, Laboratoire M2P2, Marseille, France

Résumé

Following on from Kuhn et al (2009) we study the capability of large eddy simulation with conjugate gradient heat transfer to predict thermal fluctuations with thermal mixing. Wall functions are used to model the wall heat transfer. The results show that the temperature variance on the outer skin of the solid is well predicted by the simulation. It is shown that the variance of thermal flux in the fluid closely maps the variance of thermal flux at the outer boundary of the solid. It is demonstrated that this occurs because the dissipation of temperature variance in the fluid controls the diffusion of temperature variance in the solid. Implications with respect to RANS modeling are discussed.

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