Premium
Reduced basis simulations as a tool for generating turbulent inlet‐data for two opposing jets
Author(s) -
Johansson Peter S.,
Andersson Helge I.
Publication year - 2005
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/fld.878
Subject(s) - turbulence , inlet , mechanics , jet (fluid) , physics , reynolds number , basis (linear algebra) , turbulence kinetic energy , k epsilon turbulence model , inflow , computational fluid dynamics , statistical physics , classical mechanics , geometry , mathematics , engineering , mechanical engineering
Abstract Reduced basis simulations are used in order to generate turbulent inlet boundary conditions for a direct numerical simulation of two opposing wall jets. The two entering jets are fully turbulent channel flows of Reynolds number 180, based on friction velocity and half channel height. The inflow turbulence is generated by solving dynamical equations for the large scales only, while less energetic small scales are added randomly. The proper orthogonal decomposition method is used to identify the large scale modes used in the basis set. Mean velocity and turbulence statistics have been reported in various planes of the interaction region and the outwash jet. The increase in maximum turbulence energy from the inlet jet to the stagnation region is about 500%. The spreading rate of the merged jet was found to be 0.125. Copyright © 2005 John Wiley & Sons, Ltd.