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Large eddy simulation in a turbulent channel flow using exit boundary conditions
Author(s) -
Cziesla T.,
Biswas G.,
Mitra N.K.
Publication year - 1999
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/(sici)1097-0363(19990730)30:6<763::aid-fld863>3.0.co;2-9
Subject(s) - turbulence , mechanics , equidistant , large eddy simulation , open channel flow , flow (mathematics) , channel (broadcasting) , boundary (topology) , inlet , boundary value problem , chézy formula , physics , geometry , mathematics , engineering , mathematical analysis , mechanical engineering , telecommunications
The influence of the exit boundary conditions on the vanishing first derivative of the velocity components and constant pressure on the large eddy simulation of the fully developed turbulent channel flow has been investigated for equidistant and stretched grids at the channel exit. Results show that the chosen exit boundary conditions introduce some small disturbances that are mostly damped by the grid stretching. The difference of rms values between the fully developed turbulent channel flow with periodicity conditions and the fully developed channel flow using inlet and the exit boundary conditions is less than 10% for the equidistant grids and less than 5% for the stretched grids. The chosen boundary conditions are of interest because they may be used in complex problems with back flow at the exit. Copyright © 1999 John Wiley & Sons, Ltd.