DNS of turbulent channel flow: can we imitate conjugate heat-transfer with a Robin boundary conditionReport as inadecuate




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1 EDF R&D, Département Mécanique des Fluides, Energies, Environnement. 2 PPRIME - Institut Pprime 3 MACE - School of Mechanical Aerospace and Civil Engineering

Abstract : Turbulent heat fluxes, temperature variance and associated budgets obtained from the Direct Numerical Simulation of an incompressible turbulent channel flow with a Reynolds number of 150 based on the wall friction velocity and a Prandtl number of 0.71 are presented and analysed for four different cases: imposed temperature at the wall Dirichlet, imposed heat flux Neumann, heat exchange coefficient Robin and 3D conjugate heat transfer. Present results show that a Robin boundary condition can imitate most of the one point statistics obtained with conjugate heat-transfer accurately compared to the statistics obtained with an imposed temperature or heat flux at the wall.

Keywords : DNS conjugate heat transfer Robin boundary condition Budgets





Author: Cédric Flageul - Sofiane Benhamadouche - Eric Lamballais - Dominique Laurence -

Source: https://hal.archives-ouvertes.fr/



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