Simulation of heat and mass transfer in turbulent channel flow using the spectral-element method : Effect of spatial resolution

• We use the open-source code nek5000 to assess the accuracy of high-order spectral element large-eddy simulations (LES) of a turbulent channel flow depending on the spatial resolution compared to the direct numerical simulation (DNS). The Reynolds number Re = 6800 is considered based on the bulk velocity and half-width of the channel. The filtered governing equations are closed with the dynamic Smagorinsky model for subgrid stresses and heat flux. The results show very good agreement between LES and DNS for time-averaged velocity and temperature profiles and their fluctuations. Even the coarse LES grid which contains around 30 times less points than the DNS one provided predictions of the friction velocity within 2.0% accuracy interval. 

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

Nyckelord

Channel flow

Computational fluid dynamics

Fluid dynamics

Heat flux

Hydrodynamics

Image resolution

Large eddy simulation

Numerical methods

Open source software

Open systems

Reynolds number

Dynamic Smagorinsky models

Governing equations

Heat and mass transfer

Spatial resolution

Spectral element method

Temperature profiles

Time-averaged velocity

Turbulent channel flows

Mass transfer

Publikations- och innehållstyp

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