Influence of the computational domain on DNS of turbulent heat transfer up to Re^sub t^=2000 for Pr=0.71

We present a new set of direct numerical simulation data of a passive thermal flow in a turbulent plane Poiseuille flow with constant Prandtl number Pr=0.71, and mixed boundary conditions. Simulations were performed at Reτ=500, 1000, and 2000 for several computational domains in the range of lx=2πh...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2018-07, Vol.122, p.983
Main Authors: Lluesma-Rodríguez, F, Hoyas, S, Perez-Quiles, MJ
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Computer simulation
Direct numerical simulation
Domain names
Energy dissipation
Fluid flow
Fluxes
Kinetic energy
Kinetics
Laminar flow
Numerical analysis
Prandtl number
Rayleigh number
Reynolds number
Turbulent flow
Turbulent heat transfer
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Summary:We present a new set of direct numerical simulation data of a passive thermal flow in a turbulent plane Poiseuille flow with constant Prandtl number Pr=0.71, and mixed boundary conditions. Simulations were performed at Reτ=500, 1000, and 2000 for several computational domains in the range of lx=2πh to 8πh and lz=πh to 3πh. As a first key result we found that a length of lx=2πh and a width of lz=π is enough to accurately obtain the one-point statistics and the budgets of the thermal kinetic energy, its dissipation and the thermal fluxes. None of them collapse exactly in wall units. On the other hand, the value of the thermal Kármán constant grows very slightly with the Reynolds number with a value of κth=0.44 for Reτ=2000. The statistics of all simulations can be downloaded from the web page of our http://personales.upv.es/serhocal/group.
ISSN:0017-9310
1879-2189