@Article{hmt.v2.3.3008,
AUTHOR = {Pankaj Saha, Gautam Biswas},
TITLE = {NUMERICAL SIMULATION OF TURBULENT FLOW IN A  RECTANGULAR CHANNEL WITH PERIODICALLY MOUNTED  LONGITUDINAL VORTEX GENERATORS},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {2},
YEAR = {2011},
NUMBER = {3},
PAGES = {1--5},
URL = {http://www.techscience.com/fhmt/v2n3/55748},
ISSN = {2151-8629},
ABSTRACT = {Detailed flow structure in turbulent flows through a rectangular channel containing built-in winglet type vortex generators have been analyzed by 
means of solutions of the full Navier-Stokes equations using a Large-Eddy Simulation (LES) technique. The Reynolds number of investigation is 
6000. The geometry of interest consists of a rectangular channel with a built-in winglet pair on the bottom wall with common-flow-down 
arrangement. The winglet pair induces streamwise longitudinal vortices behind it. The vortices swirl the flow around the axis parallel to the 
mainstream direction and disrupt the growth of thermal boundary layer entailing enhancement of heat transfer. The influence of the longitudinal 
vortices persist far downstream of the location of the winglet-pair. Since the structure of the turbulence is strongly affected by the streamline 
curvature, the flow of interest, despite the simplicity of its geometry, turns out to be extremely complex. Therefore it calls for more accurate 
calculation of the turbulent quantities. In the present study, flow structures are studied by using time-averaged quantities, such as the iso-contours of 
velocity components, vortices and turbulent stresses. The simulation shows that the secondary flow is stronger in the regions where the longitudinal 
vortices are more active. The wake like structures of streamwise velocity occurs due to strong distortion of the boundary layer by vortices. The 
spanwise distributions of turbulent kinetic energy and Reynolds stress show the evidence of strong secondary flow. The computational results 
compare well with the experimental data qualitatively.},
DOI = {10.5098/hmt.v2.3.3008}
}