In order to save computing resources and improve computation efficiency

it is particularly important to ensure the accuracy of the calculation results and to select a computational domain as small as possible. The influence of computational domain size on large eddy simulations of turbulent channels with periodic boundary conditions was studied. Simulations were presented in channels with streamwise and spanwise sizes of 053πδ×2δ×0177πδ

πδ×2δ×05πδ

2πδ×2δ×πδ and 3πδ×2δ×15πδ

wherein δ is the channel half-height. On the premise that the calculation conditions are the same and the settings meet large eddy simulation calculation requirements

the influence of calculation domain size on large eddy simulation numerical calculation results under friction Reynolds number of 540 and 930 was studied. It was found that the computational scale not less than 2πδ×2δ×πδ could well present the turbulence results. In addition

the accuracy of turbulence information in the same computational domain was improved at friction Reynolds number of 930.